diff --git a/visionA-frontend/src/app/conversion/components/ChipSelector.tsx b/visionA-frontend/src/app/conversion/components/ChipSelector.tsx
new file mode 100644
index 0000000..99af38d
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/ChipSelector.tsx
@@ -0,0 +1,86 @@
+"use client";
+
+/**
+ * ChipSelector — KL520 / KL630 / KL720 / KL730 RadioGroup
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §4.1)
+ *
+ * 設計目標：
+ *   - 4 個 chip 並排，視覺像「選擇按鈕」（active 是實心、未選是 outline）
+ *   - 鍵盤 ←/→ 切換、Tab 進出、Enter / Space 選中（標準 radiogroup 行為，由原生 radio input 提供）
+ *
+ * a11y：
+ *   - 用原生 `<input type="radio">` 包 `<label>`，最便宜、最可靠
+ *   - 包成 fieldset 讓 SR 讀出 group label；fieldset 上的 aria-label 由呼叫端透過 aria-labelledby 指向 Label 元件
+ */
+
+import { useId } from "react";
+
+import type { TargetChip } from "@/types/conversion";
+import { cn } from "@/lib/utils";
+
+const CHIPS: TargetChip[] = ["KL520", "KL630", "KL720", "KL730"];
+
+interface ChipSelectorProps {
+  value: TargetChip | null;
+  onChange: (next: TargetChip) => void;
+  /** 整組 disabled（uploading 時不該再改） */
+  disabled?: boolean;
+  /** SR 用的可見 Label id（例：<Label id="chip-label">…</Label>） */
+  ariaLabelledBy?: string;
+  /** 給錯誤訊息的 aria-describedby */
+  errorId?: string;
+}
+
+export function ChipSelector({
+  value,
+  onChange,
+  disabled = false,
+  ariaLabelledBy,
+  errorId,
+}: ChipSelectorProps) {
+  // 同一個 page 可能渲多個 ChipSelector（雖然此頁只有一組），用 useId 確保 name 唯一
+  const groupName = useId();
+
+  return (
+    <div
+      role="radiogroup"
+      aria-labelledby={ariaLabelledBy}
+      aria-describedby={errorId}
+      className="flex flex-wrap gap-2"
+      data-testid="chip-selector"
+    >
+      {CHIPS.map((chip) => {
+        const checked = value === chip;
+        const id = `${groupName}-${chip}`;
+        return (
+          <label
+            key={chip}
+            htmlFor={id}
+            data-testid={`chip-${chip.toLowerCase()}`}
+            data-checked={checked ? "true" : undefined}
+            className={cn(
+              "border-input flex h-10 min-w-20 cursor-pointer items-center justify-center rounded-md border px-4 text-sm font-medium transition-colors",
+              "hover:bg-accent hover:text-accent-foreground",
+              checked &&
+                "bg-primary text-primary-foreground border-primary hover:bg-primary/90 hover:text-primary-foreground",
+              disabled && "cursor-not-allowed opacity-50 hover:bg-transparent",
+            )}
+          >
+            <input
+              id={id}
+              type="radio"
+              name={groupName}
+              value={chip}
+              checked={checked}
+              disabled={disabled}
+              className="sr-only"
+              onChange={() => onChange(chip)}
+            />
+            {chip}
+          </label>
+        );
+      })}
+    </div>
+  );
+}
diff --git a/visionA-frontend/src/app/conversion/components/ExpiredView.test.tsx b/visionA-frontend/src/app/conversion/components/ExpiredView.test.tsx
new file mode 100644
index 0000000..9fcaf62
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/ExpiredView.test.tsx
@@ -0,0 +1,139 @@
+/**
+ * ExpiredView 單元測試（Phase 0.8 F-T9 sub-1）
+ *
+ * 對齊：
+ *   - wireframe-conversion.md §3.6 + §8.2（Expired state 視覺）
+ *   - flow-conversion.md §6.3（Job 7 天後過期 — 引導重做）
+ *
+ * 覆蓋：
+ *   - 過期 hero 顯示 + role="alert" + aria-live="polite"
+ *   - source filename → target chip 顯示
+ *   - 「重新轉檔」按鈕 → 呼叫 store.reset
+ *   - job=null 仍能渲（極端情境）
+ *
+ * Mock 策略：
+ *   - 真 LocaleProvider + zh-Hant 字典（驗證 i18n 串接）
+ *   - store 用 setState 設定 expired job
+ */
+
+import { fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { LocaleProvider } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+import type { ConversionJob } from "@/types/conversion";
+
+import { ExpiredView } from "./ExpiredView";
+
+/* -------------------------------------------------------------------------- */
+/* Helpers                                                                    */
+/* -------------------------------------------------------------------------- */
+
+function makeExpiredJob(overrides: Partial<ConversionJob> = {}): ConversionJob {
+  return {
+    job_id: "abcdef12-3456-7890-aaaa-bbbbccccdddd",
+    status: "succeeded", // backend 端 status；frontend 自己判斷 expires_at < now → expired
+    source_filename: "yolov5s.onnx",
+    target_chip: "KL720",
+    created_at: "2026-04-23T12:00:00Z",
+    expires_at: "2026-04-30T12:00:00Z", // 過期（在當前時間之前）
+    ...overrides,
+  };
+}
+
+function setExpired(job: ConversionJob | null = makeExpiredJob()) {
+  useConversionStore.setState({
+    uiState: "expired",
+    job,
+  });
+}
+
+function renderView() {
+  return render(
+    <LocaleProvider>
+      <ExpiredView />
+    </LocaleProvider>,
+  );
+}
+
+beforeEach(() => {
+  useConversionStore.getState().reset();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  useConversionStore.getState().reset();
+});
+
+/* -------------------------------------------------------------------------- */
+/* 主流程                                                                      */
+/* -------------------------------------------------------------------------- */
+
+describe("<ExpiredView />", () => {
+  it("顯示過期 hero（role=status + aria-live=polite + heading）", () => {
+    // F-T9 M1 m1：用 role="status"（implicit polite）取代 role="alert"+aria-live="polite"
+    // —— alert 隱含 assertive 與 polite 並存對 SR 是矛盾語意
+    setExpired();
+    renderView();
+
+    const hero = screen.getByTestId("expired-hero");
+    expect(hero).toBeInTheDocument();
+    expect(hero).toHaveAttribute("role", "status");
+    expect(hero).toHaveAttribute("aria-live", "polite");
+
+    expect(screen.getByText("此轉檔結果已過期")).toBeInTheDocument();
+    expect(screen.getByTestId("expired-description")).toHaveTextContent(
+      /轉檔結果保留期為 7 天/,
+    );
+  });
+
+  it("顯示 source filename → target chip 摘要", () => {
+    setExpired();
+    renderView();
+
+    expect(screen.getByTestId("expired-source-filename")).toHaveTextContent(
+      "yolov5s.onnx",
+    );
+    expect(screen.getByTestId("expired-target-chip")).toHaveTextContent(
+      "KL720",
+    );
+  });
+
+  it("顯示「重新轉檔」按鈕，aria-label 對齊 i18n", () => {
+    setExpired();
+    renderView();
+
+    const btn = screen.getByTestId("expired-start-new");
+    expect(btn).toBeInTheDocument();
+    expect(btn).toHaveTextContent("重新轉檔");
+    expect(btn).toHaveAttribute("aria-label", "重新開始一次轉檔");
+  });
+
+  it("點「重新轉檔」→ 呼叫 store.reset() 切回 idle", () => {
+    setExpired();
+    // spy 必須在 render 前 — 否則 useConversionStore selector 已 capture 原始 reset
+    const resetSpy = vi.spyOn(useConversionStore.getState(), "reset");
+    renderView();
+
+    fireEvent.click(screen.getByTestId("expired-start-new"));
+
+    expect(resetSpy).toHaveBeenCalledTimes(1);
+  });
+
+  it("job=null 仍能渲（不顯示摘要 card 但 hero / 按鈕仍在）", () => {
+    setExpired(null);
+    renderView();
+
+    // hero / 按鈕仍存在
+    expect(screen.getByTestId("expired-hero")).toBeInTheDocument();
+    expect(screen.getByTestId("expired-start-new")).toBeInTheDocument();
+    // 摘要 card 不顯示（沒有檔名 / chip 可秀）
+    expect(screen.queryByTestId("expired-summary")).not.toBeInTheDocument();
+  });
+
+  it("data-testid='conversion-expired' 容器存在（給 e2e 用）", () => {
+    setExpired();
+    renderView();
+    expect(screen.getByTestId("conversion-expired")).toBeInTheDocument();
+  });
+});
diff --git a/visionA-frontend/src/app/conversion/components/ExpiredView.tsx b/visionA-frontend/src/app/conversion/components/ExpiredView.tsx
new file mode 100644
index 0000000..fa57120
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/ExpiredView.tsx
@@ -0,0 +1,139 @@
+"use client";
+
+/**
+ * ExpiredView — Expired state（轉檔結果已過期、引導重做）
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §3.6 + §8.2)
+ *
+ * 對齊：
+ *   - flow-conversion.md §6.3（Job 7 天後過期 — bootstrap / polling 自動切 expired；UI 引導重做）
+ *   - feature-converter-integration.md §F4（converter 7 天 GC，UI 顯式提醒）
+ *   - flow §11 (Q4) — 「重新轉檔」放在 hero 卡內，動線單一
+ *
+ * 範圍（F-T9 sub-1）：
+ *   - hero 區塊：⚠️ 過期提示（紅色但不 alarming — 過期是預期行為，不是錯誤）
+ *   - 任務摘要：source filename → target chip（與 success / failed view 對齊）
+ *   - 解釋訊息（為什麼過期 + 怎麼處理）
+ *   - 「重新轉檔」主按鈕 → store.reset() 切 idle
+ *
+ * a11y：
+ *   - hero 用 `role="status"` + `aria-live="polite"`（過期不是緊急錯誤，用 polite 而非 assertive）
+ *     —— 過去用 `role="alert"` + `aria-live="polite"` 是 ARIA 反 pattern：alert 隱含 assertive，
+ *     兩者並存某些 SR 會視為矛盾（F-T9 M1 修補時順手調整）
+ *   - 「重新轉檔」按鈕有明確 aria-label
+ *   - 顏色：橘紅而非 destructive，避免暗示「失敗」
+ *
+ * 不做：
+ *   - 「複製 Job ID」（過期 job 的 ID 對 ops 沒意義 — converter 已 GC）
+ *   - 倒數計時（已過期，不需要）
+ */
+
+import { Clock4Icon, RefreshCwIcon } from "lucide-react";
+
+import { Button } from "@/components/ui/button";
+import { useT } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+import type { ConversionJob } from "@/types/conversion";
+
+export function ExpiredView() {
+  const t = useT();
+  const job = useConversionStore((s) => s.job);
+  const reset = useConversionStore((s) => s.reset);
+
+  // bootstrap 命中 expired 時 store 一定會塞 job；保險起見 job=null 也能渲（極端情境：
+  // GET /active 回 404 但前端誤切 expired — 不該發生）
+  return <ExpiredViewInner job={job} reset={reset} t={t} />;
+}
+
+interface ExpiredViewInnerProps {
+  job: ConversionJob | null;
+  reset: () => void;
+  t: (key: string) => string;
+}
+
+function ExpiredViewInner({ job, reset, t }: ExpiredViewInnerProps) {
+  const sourceFilename = job?.source_filename ?? "";
+  const targetChip = job?.target_chip ?? "";
+
+  const handleStartNew = () => {
+    // store.reset() 會清掉 polling / upload controller；切回 idle 後 page.tsx 自動換 IdleForm
+    reset();
+  };
+
+  return (
+    <div data-testid="conversion-expired" className="space-y-6">
+      {/* 過期 hero — role="status" + aria-live="polite"（預期行為，不需 assertive 打斷）
+          注意：原本用 role="alert" 會隱含 assertive，再寫 aria-live="polite" 會與 SR 行為矛盾；
+          已改為 role="status"（implicit polite），與 ProcessingView banner 的寫法一致 */}
+      <div
+        role="status"
+        aria-live="polite"
+        aria-label={t("conversion.expired.aria.alert")}
+        data-testid="expired-hero"
+        className="border-amber-300 bg-amber-50/40 dark:border-amber-800 dark:bg-amber-950/20 flex items-start gap-3 rounded-xl border p-6"
+      >
+        <Clock4Icon
+          aria-hidden="true"
+          className="size-6 shrink-0 text-amber-600 dark:text-amber-400"
+        />
+        <div className="space-y-1">
+          <h2 className="text-lg font-semibold">
+            {t("conversion.expired.heading")}
+          </h2>
+          <p className="text-muted-foreground text-sm" data-testid="expired-description">
+            {t("conversion.expired.description")}
+          </p>
+        </div>
+      </div>
+
+      {/* 任務摘要（若 job 還有資訊則顯示，與 success / failed 視覺對齊） */}
+      {(sourceFilename || targetChip) && (
+        <div
+          data-testid="expired-summary"
+          className="bg-card space-y-3 rounded-xl border p-6"
+        >
+          <div className="flex flex-wrap items-center gap-x-2 gap-y-1 text-sm">
+            {sourceFilename ? (
+              <span className="font-mono" data-testid="expired-source-filename">
+                {sourceFilename}
+              </span>
+            ) : null}
+            {sourceFilename && targetChip ? (
+              <span aria-hidden="true" className="text-muted-foreground">
+                →
+              </span>
+            ) : null}
+            {targetChip ? (
+              <span
+                className="bg-muted text-muted-foreground rounded px-2 py-0.5 text-xs font-medium"
+                data-testid="expired-target-chip"
+              >
+                {targetChip}
+              </span>
+            ) : null}
+          </div>
+
+          <p className="text-muted-foreground text-sm">
+            {t("conversion.expired.subDescription")}
+          </p>
+        </div>
+      )}
+
+      {/* 主動作：重新轉檔 — 單一 CTA，動線清楚 */}
+      <div className="flex justify-end border-t pt-4">
+        <Button
+          type="button"
+          variant="default"
+          size="lg"
+          onClick={handleStartNew}
+          aria-label={t("conversion.expired.aria.startNew")}
+          data-testid="expired-start-new"
+          className="gap-2"
+        >
+          <RefreshCwIcon aria-hidden="true" className="size-4" />
+          {t("conversion.expired.startNew")}
+        </Button>
+      </div>
+    </div>
+  );
+}
diff --git a/visionA-frontend/src/app/conversion/components/FailedView.test.tsx b/visionA-frontend/src/app/conversion/components/FailedView.test.tsx
new file mode 100644
index 0000000..5b1e9b9
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/FailedView.test.tsx
@@ -0,0 +1,314 @@
+/**
+ * FailedView 單元測試（Phase 0.8 F-T8）
+ *
+ * 對齊：
+ *   - wireframe-conversion.md §3.5（Failed state 視覺）
+ *   - flow-conversion.md §5.6（failed 處理 + i18n fallback 虛擬碼）
+ *   - feature-converter-integration.md §F5（錯誤碼對照表）
+ *
+ * 覆蓋：
+ *   - 已知錯誤碼 → 顯示對應翻譯訊息 + 對應 suggestions
+ *   - 未知錯誤碼 → 顯示 unknown fallback 訊息 + unknown suggestions
+ *   - job_id 顯示前 8 字（完整 ID 留 title 屬性）
+ *   - 「重新開始」按鈕 → 呼叫 store.reset
+ *   - a11y：role="alert" 在失敗 hero、error code 用 <code> 標記
+ *   - getErrorMessage / getErrorSuggestions helper：邊界情況（空字串、純未知 code）
+ *
+ * Mock 策略：
+ *   - 不 mock t()；用真 LocaleProvider + zh-Hant 字典確認 i18n 串接到位
+ *   - store 用 setState 設定 failed job
+ */
+
+import { fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { LocaleProvider } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+import type { ConversionJob } from "@/types/conversion";
+
+import {
+  FailedView,
+  getErrorMessage,
+  getErrorSuggestions,
+} from "./FailedView";
+
+/* -------------------------------------------------------------------------- */
+/* Helpers                                                                    */
+/* -------------------------------------------------------------------------- */
+
+function makeFailedJob(
+  overrides: Partial<ConversionJob> = {},
+): ConversionJob {
+  return {
+    job_id: "abcdef12-3456-7890-aaaa-bbbbccccdddd",
+    status: "failed",
+    source_filename: "yolov5s.onnx",
+    target_chip: "KL720",
+    created_at: "2026-04-30T12:00:00Z",
+    expires_at: "2026-05-07T12:00:00Z",
+    error: { code: "QUANTIZATION_FAILED" },
+    ...overrides,
+  };
+}
+
+function setFailed(job: ConversionJob = makeFailedJob()) {
+  useConversionStore.setState({
+    uiState: "failed",
+    job,
+  });
+}
+
+function renderView() {
+  return render(
+    <LocaleProvider>
+      <FailedView />
+    </LocaleProvider>,
+  );
+}
+
+beforeEach(() => {
+  useConversionStore.getState().reset();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  useConversionStore.getState().reset();
+});
+
+/* -------------------------------------------------------------------------- */
+/* 已知錯誤碼                                                                  */
+/* -------------------------------------------------------------------------- */
+
+describe("<FailedView /> — 已知錯誤碼（QUANTIZATION_FAILED）", () => {
+  it("顯示翻譯後的訊息（含「不支援的運算子」字樣）", () => {
+    setFailed();
+    renderView();
+
+    const msg = screen.getByTestId("failed-message").textContent ?? "";
+    expect(msg).toContain("不支援的運算子");
+    // 不應該顯示 raw i18n key
+    expect(msg).not.toContain("conversion.error.");
+  });
+
+  it("顯示 3 條對應的 suggestions（簡化模型 / 移除 Custom Op / input shape）", () => {
+    setFailed();
+    renderView();
+
+    const list = screen.getByTestId("failed-suggestions-list");
+    const items = list.querySelectorAll("li");
+    // QUANTIZATION_FAILED 字典裡有 3 條
+    expect(items.length).toBe(3);
+
+    const allText = Array.from(items)
+      .map((el) => el.textContent ?? "")
+      .join(" | ");
+    expect(allText).toContain("簡化");
+    expect(allText).toContain("Custom Op");
+    expect(allText).toContain("input shape");
+  });
+
+  it("顯示 source filename → target chip + 失敗字尾", () => {
+    setFailed();
+    renderView();
+
+    expect(
+      screen.getByTestId("failed-source-filename").textContent,
+    ).toContain("yolov5s.onnx");
+    expect(screen.getByTestId("failed-target-chip").textContent).toContain(
+      "KL720",
+    );
+    // 「失敗」字尾應出現在 summary 區塊
+    const summary = screen.getByTestId("failed-summary").textContent ?? "";
+    expect(summary).toContain("失敗");
+  });
+
+  it("error code 用 <code> 元素標記、顯示原始 code", () => {
+    setFailed();
+    renderView();
+
+    const codeEl = screen.getByTestId("failed-error-code");
+    expect(codeEl.tagName.toLowerCase()).toBe("code");
+    expect(codeEl.textContent).toBe("QUANTIZATION_FAILED");
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* 各個 PRD §F5 已知錯誤碼                                                      */
+/* -------------------------------------------------------------------------- */
+
+describe("<FailedView /> — PRD §F5 各個錯誤碼", () => {
+  it.each([
+    ["UNSUPPORTED_FORMAT", "不支援"],
+    ["INVALID_CHECKSUM", "毀損"],
+    ["MODEL_TOO_LARGE", "500 MB"],
+    ["QUOTA_EXCEEDED", "繁忙"],
+  ])("error.code=%s → 顯示對應翻譯（含 %s）", (code, expectSubstring) => {
+    setFailed(makeFailedJob({ error: { code } }));
+    renderView();
+
+    const msg = screen.getByTestId("failed-message").textContent ?? "";
+    expect(msg).toContain(expectSubstring);
+    // 對應 code 也要出現在 <code> 中
+    expect(screen.getByTestId("failed-error-code").textContent).toBe(code);
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* 未知錯誤碼 fallback                                                          */
+/* -------------------------------------------------------------------------- */
+
+describe("<FailedView /> — 未知錯誤碼 fallback", () => {
+  it("error.code = SOME_FUTURE_CODE → 顯示 unknown 訊息 + suggestions", () => {
+    setFailed(makeFailedJob({ error: { code: "SOME_FUTURE_CODE" } }));
+    renderView();
+
+    // unknown.message 字典：「轉檔失敗，請稍後重試。若持續發生請聯絡支援團隊」
+    const msg = screen.getByTestId("failed-message").textContent ?? "";
+    expect(msg).toContain("轉檔失敗");
+    expect(msg).toContain("聯絡支援團隊");
+
+    // unknown.suggestion1：「複製任務 ID 回報給支援團隊」
+    const list = screen.getByTestId("failed-suggestions-list");
+    const items = list.querySelectorAll("li");
+    expect(items.length).toBeGreaterThanOrEqual(1);
+    expect(items[0].textContent).toContain("複製");
+
+    // raw code 仍顯示在 <code>（給 ops debug 用）
+    expect(screen.getByTestId("failed-error-code").textContent).toBe(
+      "SOME_FUTURE_CODE",
+    );
+  });
+
+  it("job.error 缺失 → 視為 unknown，仍能正常渲染", () => {
+    setFailed(makeFailedJob({ error: undefined }));
+    renderView();
+
+    expect(screen.getByTestId("failed-message").textContent).toContain(
+      "轉檔失敗",
+    );
+    expect(screen.getByTestId("failed-error-code").textContent).toBe("unknown");
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* job_id 顯示                                                                 */
+/* -------------------------------------------------------------------------- */
+
+describe("<FailedView /> — Job ID", () => {
+  it("顯示前 8 字元；完整 ID 放在 title 屬性供 hover/copy", () => {
+    setFailed();
+    renderView();
+
+    const el = screen.getByTestId("failed-job-id");
+    expect(el.textContent).toBe("abcdef12");
+    expect(el.getAttribute("title")).toBe(
+      "abcdef12-3456-7890-aaaa-bbbbccccdddd",
+    );
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* 重新開始                                                                    */
+/* -------------------------------------------------------------------------- */
+
+describe("<FailedView /> — 重新開始按鈕", () => {
+  it("點按鈕 → 呼叫 store.reset", () => {
+    setFailed();
+    const resetSpy = vi.spyOn(useConversionStore.getState(), "reset");
+
+    renderView();
+    fireEvent.click(screen.getByTestId("failed-restart"));
+
+    expect(resetSpy).toHaveBeenCalled();
+  });
+
+  it("按鈕有明確 aria-label", () => {
+    setFailed();
+    renderView();
+    const btn = screen.getByTestId("failed-restart");
+    const ariaLabel = btn.getAttribute("aria-label") ?? "";
+    expect(ariaLabel.length).toBeGreaterThan(0);
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* a11y                                                                        */
+/* -------------------------------------------------------------------------- */
+
+describe("<FailedView /> — a11y", () => {
+  it("失敗 hero role=alert + aria-live=assertive", () => {
+    setFailed();
+    renderView();
+
+    const hero = screen.getByTestId("failed-hero");
+    expect(hero.getAttribute("role")).toBe("alert");
+    expect(hero.getAttribute("aria-live")).toBe("assertive");
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* helper 純函式測試                                                            */
+/* -------------------------------------------------------------------------- */
+
+describe("getErrorMessage / getErrorSuggestions — fallback 行為", () => {
+  // 模擬 useT 行為：找到 → 回翻譯，找不到 → 回 key
+  function makeT(dict: Record<string, string>) {
+    return (key: string): string => dict[key] ?? key;
+  }
+
+  it("getErrorMessage：已知 code → 翻譯", () => {
+    const t = makeT({
+      "conversion.error.UNSUPPORTED_FORMAT.message": "不支援格式",
+    });
+    expect(getErrorMessage(t, "UNSUPPORTED_FORMAT")).toBe("不支援格式");
+  });
+
+  it("getErrorMessage：未知 code → fallback unknown", () => {
+    const t = makeT({
+      "conversion.error.unknown.message": "通用錯誤",
+    });
+    expect(getErrorMessage(t, "TOTALLY_NEW_CODE")).toBe("通用錯誤");
+  });
+
+  it("getErrorMessage：連 unknown 也找不到 → 空字串（不丟錯）", () => {
+    const t = makeT({}); // 完全空字典
+    expect(getErrorMessage(t, "X")).toBe("");
+  });
+
+  it("getErrorSuggestions：已知 code 有 2 條 → 回 2 條（不混 unknown）", () => {
+    const t = makeT({
+      "conversion.error.X.suggestion1": "A",
+      "conversion.error.X.suggestion2": "B",
+      // X 沒有 suggestion3
+      "conversion.error.unknown.suggestion1": "fallback-1",
+      "conversion.error.unknown.suggestion2": "fallback-2",
+    });
+    expect(getErrorSuggestions(t, "X")).toEqual(["A", "B"]);
+  });
+
+  it("getErrorSuggestions：未知 code → fallback 到 unknown 全部 suggestions", () => {
+    const t = makeT({
+      "conversion.error.unknown.suggestion1": "聯絡支援",
+      "conversion.error.unknown.suggestion2": "查看狀態頁",
+    });
+    expect(getErrorSuggestions(t, "MISSING_CODE")).toEqual([
+      "聯絡支援",
+      "查看狀態頁",
+    ]);
+  });
+
+  it("getErrorSuggestions：連 unknown 都沒 → 空陣列（不丟錯）", () => {
+    const t = makeT({});
+    expect(getErrorSuggestions(t, "X")).toEqual([]);
+  });
+
+  it("getErrorSuggestions：suggestion1 找不到 → 直接停（不會跳號去拿 suggestion2）", () => {
+    const t = makeT({
+      // 故意只給 suggestion2、沒有 suggestion1
+      "conversion.error.X.suggestion2": "B",
+      "conversion.error.unknown.suggestion1": "fallback",
+    });
+    // suggestion1 找不到 → 直接 break → fallback 到 unknown
+    expect(getErrorSuggestions(t, "X")).toEqual(["fallback"]);
+  });
+});
diff --git a/visionA-frontend/src/app/conversion/components/FailedView.tsx b/visionA-frontend/src/app/conversion/components/FailedView.tsx
new file mode 100644
index 0000000..2b86334
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/FailedView.tsx
@@ -0,0 +1,274 @@
+"use client";
+
+/**
+ * FailedView — Failed state（轉檔失敗、錯誤訊息翻譯 + 建議解決方法）
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §3.5 + §8)
+ *
+ * 對齊：
+ *   - flow-conversion.md §5.6 failed → 顯示翻譯訊息 + 建議 + 重新開始
+ *   - feature-converter-integration.md §F5（錯誤碼對照表 + unknown fallback）
+ *   - api-conversion.md §6（error_code 在 backend 直接傳入，非 i18n key 形式）
+ *
+ * 範圍（F-T8）：
+ *   - 失敗 hero（紅色 ✗ + 「轉檔失敗」title），role="alert" + aria-live="assertive"
+ *   - 任務摘要：source filename → target chip（含「失敗」字尾）
+ *   - 錯誤訊息卡片：翻譯後的訊息 + error code（給 ops）+ Job ID 前 8 字元
+ *   - 建議解決方法清單（最多 3 項；找不到對應 key 走 unknown fallback）
+ *   - 「重新開始」主按鈕 → store.reset() 切回 idle
+ *   - i18n key fallback：未知 code 一律走 conversion.error.unknown.*
+ *
+ * 不做：
+ *   - 「回模型庫」按鈕（wireframe §8 有列出但任務未要求；可由 sidebar 切換）
+ *   - 「複製任務 ID」按鈕（wireframe §8 有 nice-to-have；F-T9 視情況補）
+ *
+ * a11y：
+ *   - 失敗 hero `role="alert"` + `aria-live="assertive"`（重要訊息、即時播報）
+ *   - error code 用 `<code>` 標記（pre-formatted、SR 不會逐字朗讀）
+ *   - 「重新開始」按鈕有明確 aria-label
+ *   - Dark mode 對齊既有 destructive token
+ */
+
+import { AlertCircleIcon, RefreshCwIcon } from "lucide-react";
+import { useMemo } from "react";
+
+import { Button } from "@/components/ui/button";
+import type { TranslateFn } from "@/lib/i18n/context";
+import { useT } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+import type { ConversionJob } from "@/types/conversion";
+
+/** Job ID 前 N 字元 — wireframe §3.5 顯示「abcd1234（前 8 字元）」 */
+const JOB_ID_DISPLAY_PREFIX = 8;
+/** Suggestions 上限 — i18n key 設計支援 suggestion1/2/3 */
+const MAX_SUGGESTIONS = 3;
+/** Unknown fallback 用的 i18n code key 段 */
+const UNKNOWN_CODE_KEY = "unknown";
+
+/* -------------------------------------------------------------------------- */
+/* Helpers — 安全的 i18n lookup（找不到 key 不要 throw / 不要顯示 raw key）      */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * 安全取得錯誤訊息 — 找不到對應 i18n key 時，自動 fallback 到 `conversion.error.unknown.message`。
+ *
+ * useT 的 t(key) 在找不到時回傳 key 本身（context.tsx §78–92）；我們用「翻譯結果 === key」
+ * 偵測 miss，然後 fallback。對齊 flow-conversion.md §5.6 的虛擬碼。
+ *
+ * @param t       - useT 取得的翻譯函式
+ * @param code    - converter 回傳的 error code（如 `QUANTIZATION_FAILED` / 任意未知字串）
+ * @returns 翻譯後的文字；fallback 失敗（連 unknown key 都不存在）時回空字串
+ */
+export function getErrorMessage(t: TranslateFn, code: string): string {
+  const key = `conversion.error.${code}.message`;
+  const translated = t(key);
+  if (translated !== key) return translated;
+
+  // fallback：unknown code
+  const fallbackKey = `conversion.error.${UNKNOWN_CODE_KEY}.message`;
+  const fallback = t(fallbackKey);
+  if (fallback !== fallbackKey) return fallback;
+
+  // fallback 也找不到（不應發生；i18n 字典必含 unknown.message）
+  return "";
+}
+
+/**
+ * 安全取得建議解決方法清單（最多 3 條）。
+ *
+ * 規則：
+ *   1. 先嘗試 `conversion.error.<code>.suggestion1/2/3`
+ *   2. 任一條找不到就停（不繼續往下找；3 條共用同一個 namespace）
+ *   3. 全部找不到 → fallback 到 `conversion.error.unknown.suggestion1/2/3`
+ *
+ * 為什麼不混合（找到 1 條後 fallback 補 2、3）：
+ *   - 各 code 的 suggestion 彼此語意不同（QUANTIZATION_FAILED 的「移除 Custom Op」對 unknown 沒意義）
+ *   - 若某 code 只有 suggestion1，那它就只該顯示 1 條，補 unknown 的反而誤導
+ */
+export function getErrorSuggestions(t: TranslateFn, code: string): string[] {
+  const suggestions = collectSuggestions(t, code);
+  if (suggestions.length > 0) return suggestions;
+  return collectSuggestions(t, UNKNOWN_CODE_KEY);
+}
+
+/** 從特定 code 連續抓 suggestion1..N，遇到第一個 miss 就停 */
+function collectSuggestions(t: TranslateFn, code: string): string[] {
+  const out: string[] = [];
+  for (let i = 1; i <= MAX_SUGGESTIONS; i++) {
+    const key = `conversion.error.${code}.suggestion${i}`;
+    const translated = t(key);
+    if (translated === key) break;
+    out.push(translated);
+  }
+  return out;
+}
+
+/* -------------------------------------------------------------------------- */
+/* Component                                                                  */
+/* -------------------------------------------------------------------------- */
+
+export function FailedView() {
+  const t = useT();
+  const job = useConversionStore((s) => s.job);
+  const reset = useConversionStore((s) => s.reset);
+
+  // 防呆：page.tsx 已 routing；理論上 failed state 必有 job（store 切 failed 同時設 job）
+  if (!job) return null;
+
+  return <FailedViewInner job={job} reset={reset} t={t} />;
+}
+
+interface FailedViewInnerProps {
+  job: ConversionJob;
+  reset: () => void;
+  t: TranslateFn;
+}
+
+function FailedViewInner({ job, reset, t }: FailedViewInnerProps) {
+  /* ---- 衍生資料 ---- */
+  // error code：優先用 job.error.code；極端情況 backend 漏給時 fallback unknown
+  const errorCode = job.error?.code ?? UNKNOWN_CODE_KEY;
+  const errorMessage = useMemo(
+    () => getErrorMessage(t, errorCode),
+    [t, errorCode],
+  );
+  const suggestions = useMemo(
+    () => getErrorSuggestions(t, errorCode),
+    [t, errorCode],
+  );
+
+  const sourceFilename = job.source_filename || "";
+  const targetChip = job.target_chip;
+  const shortJobId = job.job_id.slice(0, JOB_ID_DISPLAY_PREFIX);
+
+  /* ---- handler ---- */
+  const handleRestart = () => {
+    // store.reset() 會清掉 polling / upload controller；切回 idle 後 page.tsx 自動換 IdleForm
+    reset();
+  };
+
+  return (
+    <div data-testid="conversion-failed" className="space-y-6">
+      {/* 失敗 hero — role="alert" + aria-live="assertive"（重要錯誤訊息應主動播報） */}
+      <div
+        role="alert"
+        aria-live="assertive"
+        aria-label={t("conversion.failed.aria.alert")}
+        data-testid="failed-hero"
+        className="border-destructive/40 bg-destructive/5 dark:bg-destructive/10 flex items-start gap-3 rounded-xl border p-6"
+      >
+        <AlertCircleIcon
+          aria-hidden="true"
+          className="text-destructive size-6 shrink-0"
+        />
+        <div className="space-y-1">
+          <h2 className="text-lg font-semibold">
+            {t("conversion.failed.heading")}
+          </h2>
+          {/* 翻譯後的錯誤訊息（unknown fallback 已內建於 helper） */}
+          <p
+            data-testid="failed-message"
+            className="text-foreground text-sm"
+          >
+            {errorMessage}
+          </p>
+        </div>
+      </div>
+
+      {/* 任務摘要 + 錯誤碼 + Job ID */}
+      <div
+        data-testid="failed-summary"
+        className="bg-card space-y-3 rounded-xl border p-6"
+      >
+        {/* 檔名 → chip（含「失敗」字尾） */}
+        <div className="flex flex-wrap items-center gap-x-2 gap-y-1 text-sm">
+          {sourceFilename ? (
+            <span className="font-mono" data-testid="failed-source-filename">
+              {sourceFilename}
+            </span>
+          ) : null}
+          <span aria-hidden="true" className="text-muted-foreground">
+            →
+          </span>
+          <span
+            className="bg-muted text-muted-foreground rounded px-2 py-0.5 text-xs font-medium"
+            data-testid="failed-target-chip"
+          >
+            {targetChip}
+          </span>
+          <span className="text-muted-foreground text-xs">
+            {t("conversion.failed.summary.failedSuffix")}
+          </span>
+        </div>
+
+        {/* 錯誤代碼 + Job ID — dl 結構，給 SR 標籤明確 */}
+        <dl className="grid gap-3 text-sm sm:grid-cols-2">
+          <div className="space-y-0.5">
+            <dt className="text-muted-foreground text-xs">
+              {t("conversion.failed.errorCode")}
+            </dt>
+            <dd>
+              <code
+                data-testid="failed-error-code"
+                className="bg-muted text-foreground rounded px-1.5 py-0.5 font-mono text-xs"
+              >
+                {errorCode}
+              </code>
+            </dd>
+          </div>
+          <div className="space-y-0.5">
+            <dt className="text-muted-foreground text-xs">
+              {t("conversion.failed.jobIdLabel")}
+            </dt>
+            <dd
+              data-testid="failed-job-id"
+              className="font-mono text-xs"
+              // 完整 ID 給 ops 複製，但顯示只到前 8 字（wireframe §3.5）
+              title={job.job_id}
+            >
+              {shortJobId}
+            </dd>
+          </div>
+        </dl>
+      </div>
+
+      {/* 建議解決方法 */}
+      {suggestions.length > 0 ? (
+        <div
+          data-testid="failed-suggestions"
+          className="space-y-2"
+        >
+          <p className="text-sm font-medium">
+            {t("conversion.failed.suggestionsTitle")}
+          </p>
+          <ul
+            className="text-muted-foreground list-disc space-y-1 pl-5 text-sm"
+            data-testid="failed-suggestions-list"
+          >
+            {suggestions.map((s, idx) => (
+              <li key={idx} data-testid={`failed-suggestion-${idx}`}>
+                {s}
+              </li>
+            ))}
+          </ul>
+        </div>
+      ) : null}
+
+      {/* 主動作：重新開始（wireframe §3.5：在卡片外面下方對齊右側） */}
+      <div className="flex justify-end border-t pt-4">
+        <Button
+          type="button"
+          variant="default"
+          size="lg"
+          onClick={handleRestart}
+          aria-label={t("conversion.failed.aria.retry")}
+          data-testid="failed-restart"
+          className="gap-2"
+        >
+          <RefreshCwIcon aria-hidden="true" className="size-4" />
+          {t("conversion.failed.retry")}
+        </Button>
+      </div>
+    </div>
+  );
+}
diff --git a/visionA-frontend/src/app/conversion/components/FileDropzone.tsx b/visionA-frontend/src/app/conversion/components/FileDropzone.tsx
new file mode 100644
index 0000000..e5c491a
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/FileDropzone.tsx
@@ -0,0 +1,166 @@
+"use client";
+
+/**
+ * FileDropzone — 通用拖放 / 點擊選檔元件
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §4.1)
+ *
+ * 設計目標：
+ *   - 同時被「來源模型」（單檔，accept=.onnx,.tflite）與「Reference images」（多檔，accept=image/*）使用
+ *   - 拖放與點擊兩種互動都觸發同一個 `onSelect`（呼叫端拿到 File[]，再依 multiple 與否處理）
+ *   - 已選檔的呈現由呼叫端負責（這裡只做「未選」的 dropzone 視覺；選了之後呼叫端會 hide 這個元件，改顯示 chips / list）
+ *
+ * a11y：
+ *   - dropzone 本體是 `<label>` 包 `<input type="file" class="sr-only">`，鍵盤 Tab + Enter / Space 直接觸發 file picker（瀏覽器原生）
+ *   - 整體區塊用 `aria-label` 描述功能，dragover 時加 `aria-busy="true"`
+ *   - 不用 role="button"，避免覆蓋 label/input 的原生語義
+ *
+ * F-T4 不負責的：
+ *   - 檔案驗證（副檔名 / size）由呼叫端處理 — 這裡只是 UI 殼
+ *   - 拖放動畫（visualOnly hint dragover 高亮即可）
+ */
+
+import { Upload } from "lucide-react";
+import {
+  type DragEvent,
+  type ReactNode,
+  useCallback,
+  useId,
+  useState,
+} from "react";
+
+import { cn } from "@/lib/utils";
+
+interface FileDropzoneProps {
+  /** `<input accept>` — `.onnx,.tflite` 或 `image/*` 之類 */
+  accept: string;
+  /** 是否允許多檔（ref images 用） */
+  multiple?: boolean;
+  /** 主要文字（拖放區大字） — 例：「拖曳 .onnx / .tflite 到此處」 */
+  primaryLabel: string;
+  /** 「或」之類連接文字，不傳則不顯示 */
+  orLabel?: string;
+  /** 點擊按鈕文字 — 例：「選擇檔案」 */
+  browseLabel: string;
+  /** 下方 hint — 例：「支援格式：.onnx · .tflite · 最大 500 MB」 */
+  hint?: string;
+  /** 拖放或選檔後 callback；總是傳 File[]（呼叫端再依 multiple 處理） */
+  onSelect: (files: File[]) => void;
+  /** disabled 時整塊變灰並擋互動 */
+  disabled?: boolean;
+  /** 整塊高度；ref images dropzone 比 source dropzone 矮 */
+  size?: "default" | "compact";
+  /** 自訂 testid，方便測試區分多個 dropzone */
+  "data-testid"?: string;
+  /** 給 form label 用的 aria-describedby（指向錯誤訊息 id） */
+  errorId?: string;
+  /** 外部 className override */
+  className?: string;
+  /** 額外 children（理論上不用，但保留） */
+  children?: ReactNode;
+}
+
+export function FileDropzone({
+  accept,
+  multiple = false,
+  primaryLabel,
+  orLabel,
+  browseLabel,
+  hint,
+  onSelect,
+  disabled = false,
+  size = "default",
+  "data-testid": dataTestId,
+  errorId,
+  className,
+  children,
+}: FileDropzoneProps) {
+  const inputId = useId();
+  const [isDragOver, setIsDragOver] = useState(false);
+
+  const handleFiles = useCallback(
+    (fileList: FileList | null) => {
+      if (!fileList || fileList.length === 0) return;
+      onSelect(Array.from(fileList));
+    },
+    [onSelect],
+  );
+
+  const handleDragOver = useCallback(
+    (e: DragEvent<HTMLLabelElement>) => {
+      if (disabled) return;
+      e.preventDefault();
+      // 只有在 dataTransfer 帶檔案時才高亮（避免拖文字 / link 也觸發）
+      if (e.dataTransfer.types.includes("Files")) {
+        setIsDragOver(true);
+      }
+    },
+    [disabled],
+  );
+
+  const handleDragLeave = useCallback(() => {
+    setIsDragOver(false);
+  }, []);
+
+  const handleDrop = useCallback(
+    (e: DragEvent<HTMLLabelElement>) => {
+      if (disabled) return;
+      e.preventDefault();
+      setIsDragOver(false);
+      handleFiles(e.dataTransfer.files);
+    },
+    [disabled, handleFiles],
+  );
+
+  const heightCls = size === "compact" ? "min-h-20 py-4" : "min-h-32 py-6";
+
+  return (
+    <label
+      htmlFor={inputId}
+      data-testid={dataTestId}
+      data-drag-over={isDragOver ? "true" : undefined}
+      aria-label={primaryLabel}
+      aria-busy={isDragOver || undefined}
+      aria-describedby={errorId}
+      onDragOver={handleDragOver}
+      onDragEnter={handleDragOver}
+      onDragLeave={handleDragLeave}
+      onDrop={handleDrop}
+      className={cn(
+        "bg-muted/40 hover:bg-muted/60 border-input flex w-full cursor-pointer flex-col items-center justify-center gap-2 rounded-md border-2 border-dashed px-4 text-center transition-colors",
+        heightCls,
+        isDragOver && "border-primary bg-primary/5",
+        disabled && "cursor-not-allowed opacity-60 hover:bg-muted/40",
+        className,
+      )}
+    >
+      <Upload aria-hidden="true" className="text-muted-foreground size-5" />
+      <div className="text-foreground text-sm font-medium">{primaryLabel}</div>
+      <div className="text-muted-foreground flex items-center gap-2 text-xs">
+        {orLabel ? <span>{orLabel}</span> : null}
+        <span className="text-primary underline-offset-2 group-hover:underline">
+          {browseLabel}
+        </span>
+      </div>
+      {hint ? (
+        <p className="text-muted-foreground text-xs">{hint}</p>
+      ) : null}
+      {children}
+
+      {/* 真正的 file input — 用 sr-only 讓鍵盤 / 螢幕閱讀器仍可使用 */}
+      <input
+        id={inputId}
+        type="file"
+        accept={accept}
+        multiple={multiple}
+        disabled={disabled}
+        className="sr-only"
+        onChange={(e) => {
+          handleFiles(e.target.files);
+          // reset value 讓同一檔案重選也會觸發 onChange
+          e.target.value = "";
+        }}
+      />
+    </label>
+  );
+}
diff --git a/visionA-frontend/src/app/conversion/components/IdleForm.test.tsx b/visionA-frontend/src/app/conversion/components/IdleForm.test.tsx
new file mode 100644
index 0000000..5fe405a
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/IdleForm.test.tsx
@@ -0,0 +1,248 @@
+/**
+ * IdleForm 單元測試（Phase 0.8 F-T4）
+ *
+ * 對齊：
+ *   - flow-conversion.md §5.2 前端驗證表
+ *   - wireframe-conversion.md §3.1 / §4.1
+ *
+ * 覆蓋：
+ *   - 預設渲染：「開始轉檔」disabled、預設 chip = KL720
+ *   - 上傳合法 .onnx：按鈕 enabled、taskName 自動帶檔名 stem、無錯誤
+ *   - 上傳 .pt（不支援）：顯示格式錯誤、按鈕 disabled
+ *   - 上傳 600 MB：顯示太大錯誤、按鈕 disabled
+ *   - 切 chip：UI 反映 + checked 屬性正確
+ *   - 點「開始轉檔」：呼叫 store.startConversion，args 完整（file / chip / taskName）
+ *   - ref images：超過 100 張 / 單張超大會擋
+ *
+ * 注意：
+ *   - 不真的測 store 內部行為（store 已在 conversion-store.test.ts 覆蓋）
+ *   - 直接 spy `useConversionStore` 的 startConversion action
+ */
+
+import { fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { LocaleProvider } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+
+import { IdleForm } from "./IdleForm";
+
+/* -------------------------------------------------------------------------- */
+/* 工具：建立指定 size / name 的 File（File constructor 在 happy-dom 可直接用） */
+/* -------------------------------------------------------------------------- */
+
+function makeFile(name: string, sizeBytes: number, type = "application/octet-stream"): File {
+  // 用 Uint8Array 撐起所需 size；對於很大的（500 MB+）實際上 jsdom/happy-dom 可建但會佔記憶體
+  // 我們改成「fake size」：用一個小 buffer + Object.defineProperty 蓋過 size getter
+  const file = new File([new Uint8Array(1)], name, { type });
+  Object.defineProperty(file, "size", { value: sizeBytes, configurable: true });
+  return file;
+}
+
+function makeImage(name: string, sizeBytes: number): File {
+  return makeFile(name, sizeBytes, "image/png");
+}
+
+/* -------------------------------------------------------------------------- */
+/* 工具：用 fireEvent.change 觸發 input[type=file]                              */
+/* -------------------------------------------------------------------------- */
+
+function setInputFiles(input: HTMLInputElement, files: File[]) {
+  // happy-dom 接受 DataTransfer 模式；用 Object.defineProperty 直接塞 files
+  Object.defineProperty(input, "files", {
+    value: files,
+    configurable: true,
+  });
+  fireEvent.change(input);
+}
+
+/* -------------------------------------------------------------------------- */
+/* 渲染 helper                                                                  */
+/* -------------------------------------------------------------------------- */
+
+function renderForm() {
+  return render(
+    <LocaleProvider>
+      <IdleForm />
+    </LocaleProvider>,
+  );
+}
+
+/** 取「來源模型」的 file input（dropzone label 內的 sr-only input） */
+function getModelInput(): HTMLInputElement {
+  const dropzone = screen.getByTestId("model-dropzone");
+  const input = dropzone.querySelector(
+    "input[type='file']:not([multiple])",
+  ) as HTMLInputElement | null;
+  if (!input) throw new Error("model file input not found");
+  return input;
+}
+
+/** 取 ref images 的 file input（multiple） */
+function getRefImagesInput(): HTMLInputElement {
+  const dropzone = screen.getByTestId("ref-images-dropzone");
+  const input = dropzone.querySelector(
+    "input[type='file'][multiple]",
+  ) as HTMLInputElement | null;
+  if (!input) throw new Error("ref images file input not found");
+  return input;
+}
+
+/* -------------------------------------------------------------------------- */
+/* lifecycle                                                                   */
+/* -------------------------------------------------------------------------- */
+
+beforeEach(() => {
+  // 每個測試前把 store 重置（避免 startConversion mock 累積）
+  useConversionStore.getState().reset();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  useConversionStore.getState().reset();
+});
+
+/* ========================================================================== */
+/* 測試                                                                        */
+/* ========================================================================== */
+
+describe("<IdleForm />", () => {
+  it("初始渲染：「開始轉檔」disabled、預設 chip = KL720", () => {
+    renderForm();
+    const submit = screen.getByTestId("conversion-start") as HTMLButtonElement;
+    expect(submit.disabled).toBe(true);
+
+    // 預設 chip：KL720 應該被選中（data-checked="true"）
+    const chip720 = screen.getByTestId("chip-kl720");
+    expect(chip720.getAttribute("data-checked")).toBe("true");
+  });
+
+  it("上傳合法 .onnx → 按鈕 enabled + taskName 自動帶檔名 stem", () => {
+    renderForm();
+    const file = makeFile("yolov5s.onnx", 5 * 1024 * 1024);
+    setInputFiles(getModelInput(), [file]);
+
+    // 切到「已選檔」UI
+    expect(screen.getByTestId("model-selected")).toBeTruthy();
+    expect(screen.queryByTestId("model-error")).toBeNull();
+
+    // taskName 自動帶
+    const taskInput = screen.getByTestId("task-name-input") as HTMLInputElement;
+    expect(taskInput.value).toBe("yolov5s");
+
+    // 按鈕 enabled（chip 預設 KL720 已選）
+    const submit = screen.getByTestId("conversion-start") as HTMLButtonElement;
+    expect(submit.disabled).toBe(false);
+  });
+
+  it("上傳 .pt（不支援格式）→ 顯示格式錯誤、按鈕保持 disabled", () => {
+    renderForm();
+    const bad = makeFile("yolov5s.pt", 1 * 1024 * 1024);
+    setInputFiles(getModelInput(), [bad]);
+
+    const err = screen.getByTestId("model-error");
+    expect(err.textContent).toContain("ONNX");
+    // 沒切到已選檔（dropzone 應仍可見）
+    expect(screen.queryByTestId("model-selected")).toBeNull();
+
+    const submit = screen.getByTestId("conversion-start") as HTMLButtonElement;
+    expect(submit.disabled).toBe(true);
+  });
+
+  it("上傳 600 MB 模型 → 顯示太大錯誤、按鈕 disabled", () => {
+    renderForm();
+    const tooLarge = makeFile("big.onnx", 600 * 1024 * 1024);
+    setInputFiles(getModelInput(), [tooLarge]);
+
+    const err = screen.getByTestId("model-error");
+    expect(err.textContent).toContain("500 MB");
+
+    const submit = screen.getByTestId("conversion-start") as HTMLButtonElement;
+    expect(submit.disabled).toBe(true);
+  });
+
+  it("切換 chip：點 KL520 → checked 屬性切到 KL520", () => {
+    renderForm();
+
+    fireEvent.click(screen.getByTestId("chip-kl520"));
+    expect(screen.getByTestId("chip-kl520").getAttribute("data-checked")).toBe(
+      "true",
+    );
+    expect(
+      screen.getByTestId("chip-kl720").getAttribute("data-checked"),
+    ).toBeNull();
+  });
+
+  it("提交：呼叫 store.startConversion 帶完整 args（file / chip / taskName）", () => {
+    const startSpy = vi
+      .spyOn(useConversionStore.getState(), "startConversion")
+      .mockImplementation(async () => {});
+    // 把 spy 寫回 store（zustand 的 getState 回傳 snapshot，需重新 setState 接上）
+    useConversionStore.setState({ startConversion: startSpy });
+
+    renderForm();
+    const file = makeFile("yolov5s.onnx", 5 * 1024 * 1024);
+    setInputFiles(getModelInput(), [file]);
+
+    // 改 chip 到 KL520
+    fireEvent.click(screen.getByTestId("chip-kl520"));
+
+    // 改 taskName
+    const nameInput = screen.getByTestId("task-name-input") as HTMLInputElement;
+    fireEvent.change(nameInput, { target: { value: "my-yolo" } });
+
+    fireEvent.click(screen.getByTestId("conversion-start"));
+
+    expect(startSpy).toHaveBeenCalledTimes(1);
+    const args = startSpy.mock.calls[0][0];
+    expect(args.file).toBe(file);
+    expect(args.targetChip).toBe("KL520");
+    expect(args.taskName).toBe("my-yolo");
+    expect(args.refImages).toBeUndefined();
+  });
+
+  it("移除已選模型：dropzone 重新顯示、按鈕回 disabled", () => {
+    renderForm();
+    setInputFiles(getModelInput(), [makeFile("yolov5s.onnx", 5 * 1024 * 1024)]);
+    expect(screen.getByTestId("model-selected")).toBeTruthy();
+
+    fireEvent.click(screen.getByTestId("model-remove"));
+    expect(screen.queryByTestId("model-selected")).toBeNull();
+    expect(screen.getByTestId("model-dropzone")).toBeTruthy();
+
+    const submit = screen.getByTestId("conversion-start") as HTMLButtonElement;
+    expect(submit.disabled).toBe(true);
+  });
+
+  it("ref images：單張超過 10 MB → 顯示錯誤訊息（含檔名）", () => {
+    renderForm();
+    setInputFiles(getRefImagesInput(), [makeImage("huge.png", 12 * 1024 * 1024)]);
+
+    const err = screen.getByTestId("ref-images-error");
+    expect(err.textContent).toContain("huge.png");
+    expect(err.textContent).toContain("10 MB");
+  });
+
+  it("ref images：超過 100 張 → 顯示「上限 100 張」", () => {
+    renderForm();
+    const tooMany = Array.from({ length: 101 }, (_, i) =>
+      makeImage(`img-${i}.png`, 100 * 1024),
+    );
+    setInputFiles(getRefImagesInput(), tooMany);
+
+    const err = screen.getByTestId("ref-images-error");
+    expect(err.textContent).toContain("100");
+  });
+
+  it("ref images：合法多張 → 顯示總結 + 列表", () => {
+    renderForm();
+    setInputFiles(getRefImagesInput(), [
+      makeImage("a.png", 200 * 1024),
+      makeImage("b.png", 300 * 1024),
+    ]);
+
+    const summary = screen.getByTestId("ref-images-selected");
+    expect(summary.textContent).toContain("a.png");
+    expect(summary.textContent).toContain("b.png");
+  });
+});
diff --git a/visionA-frontend/src/app/conversion/components/IdleForm.tsx b/visionA-frontend/src/app/conversion/components/IdleForm.tsx
new file mode 100644
index 0000000..d1b0ee8
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/IdleForm.tsx
@@ -0,0 +1,438 @@
+"use client";
+
+/**
+ * IdleForm — Idle state 上傳表單
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §3.1 + §4.1)
+ *
+ * 對齊：
+ *   - flow-conversion.md §5.2（前端驗證表）
+ *   - api-conversion.md §1（initConversion request shape）
+ *   - i18n keys 已就位於 zh-Hant.ts / en.ts 的 `conversion.upload.*`
+ *
+ * 範圍（F-T4）：
+ *   - 上傳表單：source model（必填）、taskName（選填）、targetChip（必填）、ref images（選填）
+ *   - 前端驗證：副檔名（.onnx / .tflite）、模型 ≤ 500 MB、ref images ≤ 100 張 + 每張 ≤ 10 MB
+ *   - 「開始轉檔」呼叫 store.startConversion → store 自動切 uploading state（XHR 進度條由 F-T5 接手）
+ *
+ * 不做（後續任務）：
+ *   - uploading 進度條（F-T5）
+ *   - taskName trim 後重 derive 邏輯（與 store 的 promote-name 對齊：F-T7）
+ *   - 「加到模型庫」/「下載」（F-T7）
+ *
+ * UX 注意：
+ *   - 模型 dropzone 一旦選了會切成「已選檔」chip 顯示，再次點擊可移除
+ *   - ref images 多選：累加而非取代（drop 多次都加）；單一檔超 10 MB 會直接拒絕該檔
+ *   - 「開始轉檔」按鈕 disabled 條件：未選檔 / 未選 chip / 任一錯誤未清除
+ */
+
+import { FileText, ImageIcon, X } from "lucide-react";
+import { useCallback, useId, useMemo, useState } from "react";
+
+import { Button } from "@/components/ui/button";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { useT } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+
+import { ChipSelector } from "./ChipSelector";
+import { FileDropzone } from "./FileDropzone";
+
+/** 500 MB（wireframe §3.1 / §4.1 + flow §5.2） */
+const MAX_MODEL_BYTES = 500 * 1024 * 1024;
+/** 10 MB / 張 ref image */
+const MAX_REF_IMAGE_BYTES = 10 * 1024 * 1024;
+/** 100 張 ref images 上限 */
+const MAX_REF_IMAGE_COUNT = 100;
+/** 接受的模型副檔名 */
+const ACCEPTED_MODEL_EXT = [".onnx", ".tflite"] as const;
+
+/** 把 file.name 去掉副檔名（例：yolov5s.onnx → yolov5s） */
+function stripExtension(name: string): string {
+  const i = name.lastIndexOf(".");
+  return i > 0 ? name.slice(0, i) : name;
+}
+
+/** 1.5 MB / 23.4 KB / 480 B 之類，給 UI 顯示用 */
+function formatBytes(bytes: number): string {
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
+  if (bytes < 1024 * 1024 * 1024)
+    return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
+  return `${(bytes / (1024 * 1024 * 1024)).toFixed(1)} GB`;
+}
+
+/** 把多個檔案的總大小相加 */
+function sumSize(files: File[]): number {
+  return files.reduce((acc, f) => acc + f.size, 0);
+}
+
+interface FieldError {
+  /** 顯示文字 */
+  message: string;
+}
+
+export function IdleForm() {
+  const t = useT();
+  const startConversion = useConversionStore((s) => s.startConversion);
+
+  // ── form metadata（F-T9 M1：提到 store） ──
+  // 為什麼 metadata 進 store、File 留 local：見 conversion-store.ts ConversionFormDraft 註解。
+  // 簡述：page.tsx 條件 render 會讓 IdleForm 在 idle ↔ uploading 之間 unmount/re-mount，
+  // metadata 提到 store 才能跨 mount 保留；File 物件不可序列化、不存 store。
+  const formDraft = useConversionStore((s) => s.formDraft);
+  const updateFormDraft = useConversionStore((s) => s.updateFormDraft);
+
+  const taskName = formDraft.taskName;
+  const taskNameTouched = formDraft.taskNameTouched;
+  const chip = formDraft.targetChip;
+
+  // ── File 物件（local；上傳失敗回 idle 後 user 需重選檔） ──
+  // 這也是為什麼上傳失敗 toast 文案改成「請重新選擇檔案再試」—— 對齊實作真實行為
+  const [file, setFile] = useState<File | null>(null);
+  const [refImages, setRefImages] = useState<File[]>([]);
+
+  // ── 各欄位錯誤（前端驗證；不打 API） ──
+  const [fileError, setFileError] = useState<FieldError | null>(null);
+  const [refImagesError, setRefImagesError] = useState<FieldError | null>(null);
+
+  // ── error region id（給 dropzone aria-describedby 指向） ──
+  const fileErrorId = useId();
+  const refImagesErrorId = useId();
+  const chipLabelId = useId();
+
+  /* ----------------------------------------------------------------------
+   * 模型檔處理
+   * -------------------------------------------------------------------- */
+  const handleModelFiles = useCallback(
+    (files: File[]) => {
+      // 單檔：永遠取第一個（drop 多檔時也只收第一個，避免使用者誤把 ref images 拖過來）
+      const next = files[0];
+      if (!next) return;
+
+      const lower = next.name.toLowerCase();
+      const okExt = ACCEPTED_MODEL_EXT.some((ext) => lower.endsWith(ext));
+      if (!okExt) {
+        setFile(null);
+        updateFormDraft({ fileName: null, fileSize: null });
+        setFileError({ message: t("conversion.upload.error.unsupported") });
+        return;
+      }
+      if (next.size > MAX_MODEL_BYTES) {
+        setFile(null);
+        updateFormDraft({ fileName: null, fileSize: null });
+        setFileError({ message: t("conversion.upload.error.modelTooLarge") });
+        return;
+      }
+
+      setFile(next);
+      // metadata 進 store（給跨 mount 保留 + 顯示用）
+      updateFormDraft({
+        fileName: next.name,
+        fileSize: next.size,
+        // 第一次選檔自動帶任務名（使用者改過後不再覆蓋）
+        ...(taskNameTouched ? {} : { taskName: stripExtension(next.name) }),
+      });
+      setFileError(null);
+    },
+    [t, taskNameTouched, updateFormDraft],
+  );
+
+  const handleRemoveModel = useCallback(() => {
+    setFile(null);
+    setFileError(null);
+    updateFormDraft({
+      fileName: null,
+      fileSize: null,
+      // 沒手動改過任務名 → 跟著清；改過則保留
+      ...(taskNameTouched ? {} : { taskName: "" }),
+    });
+  }, [taskNameTouched, updateFormDraft]);
+
+  /* ----------------------------------------------------------------------
+   * Ref images 處理（多檔、累加）
+   * -------------------------------------------------------------------- */
+  const handleRefImagesFiles = useCallback(
+    (incoming: File[]) => {
+      // 過濾單檔超大的（顯示第一個違規檔的訊息）
+      const oversized = incoming.find((f) => f.size > MAX_REF_IMAGE_BYTES);
+      if (oversized) {
+        setRefImagesError({
+          message: t("conversion.upload.error.refTooLarge").replace(
+            "{filename}",
+            oversized.name,
+          ),
+        });
+        // 仍把符合條件的累加進去（friendly：使用者拖了 5 張，1 張超大不要全擋）
+        const ok = incoming.filter((f) => f.size <= MAX_REF_IMAGE_BYTES);
+        if (ok.length === 0) return;
+        // 跑下方數量檢查
+        incoming = ok;
+      }
+
+      const merged = [...refImages, ...incoming];
+      if (merged.length > MAX_REF_IMAGE_COUNT) {
+        setRefImagesError({
+          message: t("conversion.upload.error.refTooMany"),
+        });
+        return;
+      }
+
+      // 沒「上限超過」的錯誤就清除（保留「單檔過大」的 toast 風 message）
+      // 但這裡選擇直接清除；單檔過大只是引導，下次拖正常檔就消失
+      if (!oversized) {
+        setRefImagesError(null);
+      }
+      setRefImages(merged);
+      updateFormDraft({ refImagesNames: merged.map((f) => f.name) });
+    },
+    [refImages, t, updateFormDraft],
+  );
+
+  const handleRemoveRefImage = useCallback(
+    (index: number) => {
+      setRefImages((prev) => {
+        const next = prev.filter((_, i) => i !== index);
+        updateFormDraft({ refImagesNames: next.map((f) => f.name) });
+        return next;
+      });
+      setRefImagesError(null);
+    },
+    [updateFormDraft],
+  );
+
+  const handleRemoveAllRefImages = useCallback(() => {
+    setRefImages([]);
+    updateFormDraft({ refImagesNames: [] });
+    setRefImagesError(null);
+  }, [updateFormDraft]);
+
+  /* ----------------------------------------------------------------------
+   * 「開始轉檔」
+   * -------------------------------------------------------------------- */
+  const canSubmit = useMemo(() => {
+    if (!file) return false;
+    if (fileError) return false;
+    if (!chip) return false;
+    if (refImagesError) return false;
+    return true;
+  }, [file, fileError, chip, refImagesError]);
+
+  const handleSubmit = useCallback(() => {
+    if (!file || !chip) return;
+    void startConversion({
+      file,
+      refImages: refImages.length > 0 ? refImages : undefined,
+      targetChip: chip,
+      taskName: taskName.trim() || undefined,
+    });
+  }, [file, chip, refImages, taskName, startConversion]);
+
+  /* ----------------------------------------------------------------------
+   * Render
+   * -------------------------------------------------------------------- */
+  const refImagesSummary = t("conversion.upload.refImages.summary")
+    .replace("{count}", String(refImages.length))
+    .replace("{totalSize}", formatBytes(sumSize(refImages)));
+
+  return (
+    <form
+      data-testid="conversion-idle-form"
+      noValidate
+      onSubmit={(e) => {
+        e.preventDefault();
+        handleSubmit();
+      }}
+      className="space-y-6"
+    >
+      {/* ── 來源模型 ── */}
+      <div className="space-y-2">
+        <Label>
+          {t("conversion.upload.source.label")}
+          <span aria-hidden="true" className="text-destructive ml-0.5">
+            *
+          </span>
+        </Label>
+
+        {!file ? (
+          <FileDropzone
+            data-testid="model-dropzone"
+            accept={ACCEPTED_MODEL_EXT.join(",")}
+            primaryLabel={t("conversion.upload.source.dropzone")}
+            orLabel={t("conversion.upload.source.or")}
+            browseLabel={t("conversion.upload.source.browse")}
+            hint={t("conversion.upload.source.formatHint")}
+            onSelect={handleModelFiles}
+            errorId={fileError ? fileErrorId : undefined}
+          />
+        ) : (
+          <div
+            data-testid="model-selected"
+            className="bg-card flex items-center justify-between gap-3 rounded-md border px-3 py-2"
+          >
+            <div className="flex min-w-0 items-center gap-3">
+              <FileText
+                aria-hidden="true"
+                className="text-muted-foreground size-4 shrink-0"
+              />
+              <div className="min-w-0">
+                <p className="truncate text-sm font-medium">{file.name}</p>
+                <p className="text-muted-foreground text-xs">
+                  {formatBytes(file.size)}
+                </p>
+              </div>
+            </div>
+            <Button
+              type="button"
+              variant="ghost"
+              size="sm"
+              onClick={handleRemoveModel}
+              aria-label={t("conversion.upload.source.remove")}
+              data-testid="model-remove"
+            >
+              <X aria-hidden="true" className="size-4" />
+              <span className="sr-only sm:not-sr-only">
+                {t("conversion.upload.source.remove")}
+              </span>
+            </Button>
+          </div>
+        )}
+
+        {fileError ? (
+          <p
+            id={fileErrorId}
+            role="alert"
+            aria-live="polite"
+            className="text-destructive text-sm"
+            data-testid="model-error"
+          >
+            {fileError.message}
+          </p>
+        ) : null}
+      </div>
+
+      {/* ── 目標晶片 ── */}
+      <div className="space-y-2">
+        <Label id={chipLabelId}>
+          {t("conversion.upload.chip.label")}
+          <span aria-hidden="true" className="text-destructive ml-0.5">
+            *
+          </span>
+        </Label>
+        <ChipSelector
+          value={chip}
+          onChange={(next) => updateFormDraft({ targetChip: next })}
+          ariaLabelledBy={chipLabelId}
+        />
+      </div>
+
+      {/* ── Reference images（選填） ── */}
+      <div className="space-y-2">
+        <Label>{t("conversion.upload.refImages.label")}</Label>
+        <FileDropzone
+          data-testid="ref-images-dropzone"
+          accept="image/*"
+          multiple
+          size="compact"
+          primaryLabel={t("conversion.upload.refImages.dropzone")}
+          orLabel={t("conversion.upload.source.or")}
+          browseLabel={t("conversion.upload.source.browse")}
+          hint={t("conversion.upload.refImages.hint")}
+          onSelect={handleRefImagesFiles}
+          errorId={refImagesError ? refImagesErrorId : undefined}
+        />
+
+        {refImages.length > 0 ? (
+          <div
+            data-testid="ref-images-selected"
+            className="bg-card space-y-2 rounded-md border p-3"
+          >
+            <div className="flex items-center justify-between">
+              <p className="text-sm font-medium">{refImagesSummary}</p>
+              <Button
+                type="button"
+                variant="ghost"
+                size="sm"
+                onClick={handleRemoveAllRefImages}
+                data-testid="ref-images-remove-all"
+              >
+                {t("conversion.upload.refImages.removeAll")}
+              </Button>
+            </div>
+            <ul className="grid grid-cols-2 gap-2 sm:grid-cols-3 lg:grid-cols-4">
+              {refImages.map((img, i) => (
+                <li
+                  key={`${img.name}-${i}`}
+                  className="bg-muted/40 flex items-center justify-between gap-2 rounded-md border px-2 py-1.5"
+                >
+                  <div className="flex min-w-0 items-center gap-2">
+                    <ImageIcon
+                      aria-hidden="true"
+                      className="text-muted-foreground size-3.5 shrink-0"
+                    />
+                    <span className="truncate text-xs">{img.name}</span>
+                  </div>
+                  <button
+                    type="button"
+                    onClick={() => handleRemoveRefImage(i)}
+                    className="text-muted-foreground hover:text-foreground -mr-1 rounded p-1"
+                    aria-label={`${t("conversion.upload.source.remove")}: ${img.name}`}
+                  >
+                    <X aria-hidden="true" className="size-3" />
+                  </button>
+                </li>
+              ))}
+            </ul>
+          </div>
+        ) : null}
+
+        {refImagesError ? (
+          <p
+            id={refImagesErrorId}
+            role="alert"
+            aria-live="polite"
+            className="text-destructive text-sm"
+            data-testid="ref-images-error"
+          >
+            {refImagesError.message}
+          </p>
+        ) : null}
+      </div>
+
+      {/* ── 任務名稱（選填） ── */}
+      <div className="space-y-2">
+        <Label htmlFor="conversion-task-name">
+          {t("conversion.upload.name.label")}
+        </Label>
+        <Input
+          id="conversion-task-name"
+          data-testid="task-name-input"
+          value={taskName}
+          onChange={(e) =>
+            updateFormDraft({
+              taskName: e.target.value,
+              taskNameTouched: true,
+            })
+          }
+          placeholder="yolov5s"
+          autoComplete="off"
+        />
+        <p className="text-muted-foreground text-xs">
+          {t("conversion.upload.name.hint")}
+        </p>
+      </div>
+
+      {/* ── 提交 ── */}
+      <div className="flex justify-end">
+        <Button
+          type="submit"
+          size="lg"
+          disabled={!canSubmit}
+          data-testid="conversion-start"
+        >
+          {t("conversion.upload.start")}
+        </Button>
+      </div>
+    </form>
+  );
+}
diff --git a/visionA-frontend/src/app/conversion/components/ProcessingView.test.tsx b/visionA-frontend/src/app/conversion/components/ProcessingView.test.tsx
new file mode 100644
index 0000000..8805993
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/ProcessingView.test.tsx
@@ -0,0 +1,464 @@
+/**
+ * ProcessingView 單元測試（Phase 0.8 F-T6）
+ *
+ * 對齊：
+ *   - wireframe-conversion.md §3.3（Processing state 視覺）
+ *   - flow-conversion.md §5.3（queued → running → succeeded/failed transitions）
+ *   - api-conversion.md §2 GET response shape
+ *
+ * 覆蓋：
+ *   - status=queued → 排隊文字 + 三段 stage 全 pending
+ *   - status=running, stage=onnx → onnx 進行中
+ *   - status=running, stage=bie  → onnx 完成、bie 進行中
+ *   - status=running, stage=nef  → onnx/bie 完成、nef 進行中
+ *   - progress=45 → progress bar 顯示百分比
+ *   - progress=null → indeterminate progress
+ *   - 7 天清除提醒顯示
+ *   - mount → document.title 含 prefix；unmount → 還原
+ *
+ * 不負責：
+ *   - polling 行為（store 自己有測試）
+ *   - i18n key parity（i18n.test.ts 已測）
+ *   - state 切換到 succeeded/failed 的視覺（F-T7 才接）
+ */
+
+import { act, fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { LocaleProvider, useLocale } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+import type { ConversionJob, ConversionStage } from "@/types/conversion";
+
+import { ProcessingView } from "./ProcessingView";
+
+/* -------------------------------------------------------------------------- */
+/* Helpers                                                                    */
+/* -------------------------------------------------------------------------- */
+
+function makeJob(
+  overrides: Partial<ConversionJob> & {
+    status: ConversionJob["status"];
+  },
+): ConversionJob {
+  return {
+    job_id: "job-test",
+    source_filename: "yolov5s.onnx",
+    target_chip: "KL720",
+    created_at: new Date().toISOString(),
+    expires_at: new Date(Date.now() + 7 * 86400_000).toISOString(),
+    ...overrides,
+  };
+}
+
+function setQueued() {
+  useConversionStore.setState({
+    uiState: "queued",
+    job: makeJob({ status: "queued" }),
+  });
+}
+
+function setRunning(stage: ConversionStage, progress: number | undefined) {
+  useConversionStore.setState({
+    uiState: "running",
+    job: makeJob({ status: "running", stage, progress }),
+  });
+}
+
+function renderView() {
+  return render(
+    <LocaleProvider>
+      <ProcessingView />
+    </LocaleProvider>,
+  );
+}
+
+/* -------------------------------------------------------------------------- */
+/* Lifecycle                                                                  */
+/* -------------------------------------------------------------------------- */
+
+const ORIGINAL_TITLE = "visionA Cloud — Test";
+
+beforeEach(() => {
+  useConversionStore.getState().reset();
+  // 統一測試前 title，避免上一個測試殘留
+  document.title = ORIGINAL_TITLE;
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  useConversionStore.getState().reset();
+  document.title = ORIGINAL_TITLE;
+});
+
+/* -------------------------------------------------------------------------- */
+/* queued state                                                               */
+/* -------------------------------------------------------------------------- */
+
+describe("<ProcessingView /> — queued state", () => {
+  it("data-phase='queued' + 顯示「排隊中⋯」文字", () => {
+    setQueued();
+    renderView();
+
+    const view = screen.getByTestId("conversion-processing");
+    expect(view.getAttribute("data-phase")).toBe("queued");
+
+    expect(screen.getByTestId("processing-progress-queued")).toBeTruthy();
+    const queuedText =
+      screen.getByTestId("processing-queued-text").textContent ?? "";
+    expect(
+      queuedText.includes("排隊中") || queuedText.includes("Queued"),
+    ).toBe(true);
+
+    // 沒有 determinate / indeterminate progress（兩者都是 running 才有）
+    expect(screen.queryByTestId("processing-progress-determinate")).toBeNull();
+    expect(screen.queryByTestId("processing-progress-indeterminate")).toBeNull();
+  });
+
+  it("三段 stage 全部 pending", () => {
+    setQueued();
+    renderView();
+
+    expect(
+      screen.getByTestId("processing-stage-onnx").getAttribute("data-status"),
+    ).toBe("pending");
+    expect(
+      screen.getByTestId("processing-stage-bie").getAttribute("data-status"),
+    ).toBe("pending");
+    expect(
+      screen.getByTestId("processing-stage-nef").getAttribute("data-status"),
+    ).toBe("pending");
+    // queued 階段沒有 aria-current="step"
+    expect(
+      screen.queryByTestId("processing-stage-onnx")?.getAttribute("aria-current"),
+    ).toBeNull();
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* running state — stage indicator                                            */
+/* -------------------------------------------------------------------------- */
+
+describe("<ProcessingView /> — running stage indicator", () => {
+  it("stage=onnx → onnx 為 current、其他 pending", () => {
+    setRunning("onnx", undefined);
+    renderView();
+
+    expect(
+      screen.getByTestId("processing-stage-onnx").getAttribute("data-status"),
+    ).toBe("current");
+    expect(
+      screen.getByTestId("processing-stage-onnx").getAttribute("aria-current"),
+    ).toBe("step");
+    expect(
+      screen.getByTestId("processing-stage-bie").getAttribute("data-status"),
+    ).toBe("pending");
+    expect(
+      screen.getByTestId("processing-stage-nef").getAttribute("data-status"),
+    ).toBe("pending");
+  });
+
+  it("stage=bie → onnx 完成、bie current、nef pending", () => {
+    setRunning("bie", 30);
+    renderView();
+
+    expect(
+      screen.getByTestId("processing-stage-onnx").getAttribute("data-status"),
+    ).toBe("completed");
+    expect(
+      screen.getByTestId("processing-stage-bie").getAttribute("data-status"),
+    ).toBe("current");
+    expect(
+      screen.getByTestId("processing-stage-bie").getAttribute("aria-current"),
+    ).toBe("step");
+    expect(
+      screen.getByTestId("processing-stage-nef").getAttribute("data-status"),
+    ).toBe("pending");
+  });
+
+  it("stage=nef → onnx/bie 完成、nef current", () => {
+    setRunning("nef", 80);
+    renderView();
+
+    expect(
+      screen.getByTestId("processing-stage-onnx").getAttribute("data-status"),
+    ).toBe("completed");
+    expect(
+      screen.getByTestId("processing-stage-bie").getAttribute("data-status"),
+    ).toBe("completed");
+    expect(
+      screen.getByTestId("processing-stage-nef").getAttribute("data-status"),
+    ).toBe("current");
+    expect(
+      screen.getByTestId("processing-stage-nef").getAttribute("aria-current"),
+    ).toBe("step");
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* progress bar                                                               */
+/* -------------------------------------------------------------------------- */
+
+describe("<ProcessingView /> — progress bar", () => {
+  it("running + progress=45 → determinate progress 顯示 45%", () => {
+    setRunning("bie", 45);
+    renderView();
+
+    const bar = screen.getByTestId("processing-progress-determinate");
+    expect(bar).toBeTruthy();
+    expect(bar.getAttribute("aria-valuenow")).toBe("45");
+
+    expect(
+      screen.getByTestId("processing-progress-pct").textContent,
+    ).toContain("45%");
+
+    // 沒有 indeterminate / queued 視覺
+    expect(screen.queryByTestId("processing-progress-indeterminate")).toBeNull();
+    expect(screen.queryByTestId("processing-progress-queued")).toBeNull();
+  });
+
+  it("running + progress=undefined → indeterminate progress + role=progressbar", () => {
+    setRunning("onnx", undefined);
+    renderView();
+
+    const bar = screen.getByTestId("processing-progress-indeterminate");
+    expect(bar).toBeTruthy();
+    expect(bar.getAttribute("role")).toBe("progressbar");
+    expect(bar.getAttribute("aria-busy")).toBe("true");
+    expect(bar.getAttribute("aria-label")?.length ?? 0).toBeGreaterThan(0);
+
+    expect(screen.queryByTestId("processing-progress-determinate")).toBeNull();
+  });
+
+  it("running + progress=0 → 仍走 determinate（顯示 0%）", () => {
+    // 0 是合法的 progress（剛開始），不該被當成 null fall through
+    setRunning("onnx", 0);
+    renderView();
+
+    expect(screen.getByTestId("processing-progress-determinate")).toBeTruthy();
+    expect(
+      screen.getByTestId("processing-progress-pct").textContent,
+    ).toContain("0%");
+  });
+
+  it("progress 異常值 clamp（>100 → 100、<0 → 0）— Minor #2 修補", () => {
+    // backend 萬一回 150 或 -10，UI 顯示與 aria-valuenow 都該被 clamp 在 0-100
+    setRunning("nef", 150);
+    const { unmount } = renderView();
+    expect(
+      screen.getByTestId("processing-progress-pct").textContent,
+    ).toContain("100%");
+    expect(
+      screen
+        .getByTestId("processing-progress-determinate")
+        .getAttribute("aria-valuenow"),
+    ).toBe("100");
+    unmount();
+
+    setRunning("onnx", -10);
+    renderView();
+    expect(
+      screen.getByTestId("processing-progress-pct").textContent,
+    ).toContain("0%");
+    expect(
+      screen
+        .getByTestId("processing-progress-determinate")
+        .getAttribute("aria-valuenow"),
+    ).toBe("0");
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* expiry hint                                                                */
+/* -------------------------------------------------------------------------- */
+
+describe("<ProcessingView /> — 7 天清除提醒", () => {
+  it("queued + running 都顯示 expiry hint", () => {
+    setQueued();
+    const { unmount } = renderView();
+    expect(screen.getByTestId("processing-expiry-hint")).toBeTruthy();
+    unmount();
+
+    setRunning("bie", 45);
+    renderView();
+    expect(screen.getByTestId("processing-expiry-hint")).toBeTruthy();
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* 來源檔名 + chip                                                              */
+/* -------------------------------------------------------------------------- */
+
+describe("<ProcessingView /> — job summary", () => {
+  it("顯示來源檔名 + target chip", () => {
+    setRunning("onnx", undefined);
+    renderView();
+
+    expect(
+      screen.getByTestId("processing-source-filename").textContent,
+    ).toContain("yolov5s.onnx");
+    expect(
+      screen.getByTestId("processing-target-chip").textContent,
+    ).toContain("KL720");
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* tab title                                                                  */
+/* -------------------------------------------------------------------------- */
+
+describe("<ProcessingView /> — tab title", () => {
+  it("mount → document.title 加上 prefix；unmount → 還原", () => {
+    setRunning("bie", 45);
+    expect(document.title).toBe(ORIGINAL_TITLE);
+
+    const { unmount } = renderView();
+
+    // 至少有 prefix（zh 或 en）
+    const titledTitle = document.title;
+    expect(
+      titledTitle.startsWith("(轉檔中) ") ||
+        titledTitle.startsWith("(Converting) "),
+    ).toBe(true);
+    expect(titledTitle.endsWith(ORIGINAL_TITLE)).toBe(true);
+
+    unmount();
+    expect(document.title).toBe(ORIGINAL_TITLE);
+  });
+
+  it("已有 prefix 時不疊加（重新進入頁面安全）", () => {
+    // 模擬上次離開沒清乾淨：title 已含 prefix
+    document.title = "(轉檔中) " + ORIGINAL_TITLE;
+    setRunning("onnx", undefined);
+
+    const { unmount } = renderView();
+
+    // 不會變成「(轉檔中) (轉檔中) ...」
+    const titledTitle = document.title;
+    const zhPrefixCount = (titledTitle.match(/\(轉檔中\) /g) ?? []).length;
+    const enPrefixCount = (titledTitle.match(/\(Converting\) /g) ?? []).length;
+    expect(zhPrefixCount + enPrefixCount).toBe(1);
+
+    unmount();
+    // unmount 後應該回到「沒 prefix 的版本」
+    expect(document.title).toBe(ORIGINAL_TITLE);
+  });
+
+  it("locale 切換時不會累積疊加（zh → en → zh）— Major #1 修補", () => {
+    // 內部測試元件：暴露 setLocale 給外部按鈕觸發
+    function LocaleSwitcher() {
+      const { setLocale } = useLocale();
+      return (
+        <div>
+          <button data-testid="to-en" onClick={() => setLocale("en")}>
+            en
+          </button>
+          <button data-testid="to-zh" onClick={() => setLocale("zh-Hant")}>
+            zh
+          </button>
+        </div>
+      );
+    }
+
+    setRunning("bie", 45);
+    expect(document.title).toBe(ORIGINAL_TITLE);
+
+    const { unmount } = render(
+      <LocaleProvider initialLocale="zh-Hant">
+        <LocaleSwitcher />
+        <ProcessingView />
+      </LocaleProvider>,
+    );
+
+    // 1) 初始 zh prefix
+    expect(document.title).toBe("(轉檔中) " + ORIGINAL_TITLE);
+
+    // 2) 切到 en — 應該變成「(Converting) <ORIGINAL>」，不能變成「(Converting) (轉檔中) ...」
+    act(() => {
+      fireEvent.click(screen.getByTestId("to-en"));
+    });
+    expect(document.title).toBe("(Converting) " + ORIGINAL_TITLE);
+    // 沒有舊 prefix 殘留
+    expect(document.title.includes("(轉檔中)")).toBe(false);
+
+    // 3) 切回 zh — 還是乾淨的單層 prefix
+    act(() => {
+      fireEvent.click(screen.getByTestId("to-zh"));
+    });
+    expect(document.title).toBe("(轉檔中) " + ORIGINAL_TITLE);
+    expect(document.title.includes("(Converting)")).toBe(false);
+
+    // 4) unmount 還原原始 title（不留任何 prefix）
+    unmount();
+    expect(document.title).toBe(ORIGINAL_TITLE);
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* F-T9 sub-2：「您已有一個轉檔正在進行中」banner                                  */
+/* -------------------------------------------------------------------------- */
+
+describe("<ProcessingView /> — switched-from-active-job banner (F-T9 sub-2)", () => {
+  it("switchedFromActiveJob=false 時不顯示 banner", () => {
+    setRunning("onnx", undefined);
+    useConversionStore.setState({ switchedFromActiveJob: false });
+    renderView();
+    expect(
+      screen.queryByTestId("processing-switched-banner"),
+    ).not.toBeInTheDocument();
+  });
+
+  it("switchedFromActiveJob=true 時顯示 banner（role=status + aria-live=polite）", () => {
+    setRunning("onnx", undefined);
+    useConversionStore.setState({ switchedFromActiveJob: true });
+    renderView();
+
+    const banner = screen.getByTestId("processing-switched-banner");
+    expect(banner).toBeInTheDocument();
+    expect(banner).toHaveAttribute("role", "status");
+    expect(banner).toHaveAttribute("aria-live", "polite");
+    // 文案對齊 i18n（zh-Hant 預設）
+    expect(banner).toHaveTextContent(
+      /您已有一個轉檔正在進行中，已切換至該任務/,
+    );
+  });
+
+  it("queued 狀態下也顯示 banner（user 收 409 後 bootstrap 進來可能在 queued）", () => {
+    setQueued();
+    useConversionStore.setState({ switchedFromActiveJob: true });
+    renderView();
+    expect(
+      screen.getByTestId("processing-switched-banner"),
+    ).toBeInTheDocument();
+  });
+
+  it("點 dismiss 按鈕後 banner 消失（local state，不動 store flag）", () => {
+    setRunning("onnx", undefined);
+    useConversionStore.setState({ switchedFromActiveJob: true });
+    renderView();
+
+    expect(
+      screen.getByTestId("processing-switched-banner"),
+    ).toBeInTheDocument();
+
+    fireEvent.click(
+      screen.getByTestId("processing-switched-banner-dismiss"),
+    );
+
+    expect(
+      screen.queryByTestId("processing-switched-banner"),
+    ).not.toBeInTheDocument();
+    // store flag 不變（dismiss 只清 local state）
+    expect(useConversionStore.getState().switchedFromActiveJob).toBe(true);
+  });
+
+  it("dismiss 按鈕有可被 SR 讀到的 aria-label", () => {
+    setRunning("onnx", undefined);
+    useConversionStore.setState({ switchedFromActiveJob: true });
+    renderView();
+
+    const dismissBtn = screen.getByTestId(
+      "processing-switched-banner-dismiss",
+    );
+    expect(dismissBtn).toHaveAttribute("aria-label", "關閉提示");
+  });
+});
diff --git a/visionA-frontend/src/app/conversion/components/ProcessingView.tsx b/visionA-frontend/src/app/conversion/components/ProcessingView.tsx
new file mode 100644
index 0000000..301b48a
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/ProcessingView.tsx
@@ -0,0 +1,493 @@
+"use client";
+
+/**
+ * ProcessingView — Queued / Running state（轉檔處理中）
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §3.3)
+ *
+ * 對齊：
+ *   - flow-conversion.md §5.3（queued → running → succeeded/failed transitions）
+ *   - flow-conversion.md §4 state machine（uiState='queued' / 'running' 共用此元件）
+ *   - api-conversion.md §2 GET response shape（status / stage / progress / source_filename / target_chip）
+ *   - i18n keys 已就位於 zh-Hant.ts / en.ts 的 `conversion.processing.*`（F-T6 新增 stage / eta / expiry / tabTitle 等）
+ *
+ * 範圍（F-T6）：
+ *   - 同時涵蓋 queued + running 兩種 store.uiState（視覺幾乎相同，差別只在 stage indicator 標示）
+ *   - 三段式 stage indicator（onnx → bie → nef）— 對應 converter 真實 stage
+ *   - Progress bar：
+ *       queued    → 隱藏 progress bar，改顯示「排隊中⋯」+ aria-busy
+ *       running   → 有 progress 顯示百分比；progress=null → indeterminate（pulse 動畫）
+ *   - ETA 預估：converter 不給 ETA，所以顯示「請耐心等候」/「剩餘時間估算中」（不自己算）
+ *   - 7 天後自動清除提醒
+ *   - Tab title：mount 改「(轉檔中) <原 title>」、unmount 還原
+ *
+ * 不做：
+ *   - beforeunload warning（processing 是 backend 在跑，user 切走不影響 polling）
+ *   - polling 控制（store F-T3 自管 setTimeout + visibilitychange，UI 只訂閱 state）
+ *   - 切到 succeeded / failed 的視覺（F-T7 處理；store 自動切 uiState 後 page.tsx 換成 SuccessView / FailedView）
+ *
+ * UX 細節：
+ *   - stage indicator 自寫輕量元件（既有 ui/ 沒 stepper；用 <ol role="list"> 語義化 + aria-current）
+ *   - progress bar 在 indeterminate 模式下用 sr-only 字 + aria-live 提供 a11y fallback
+ *   - prefers-reduced-motion 由 Tailwind `motion-reduce:` 保留（避免 indeterminate 動畫對眩暈使用者造成困擾）
+ */
+
+import { CheckIcon, InfoIcon, Loader2Icon, XIcon } from "lucide-react";
+import { useEffect, useId, useMemo, useRef, useState } from "react";
+
+import { Button } from "@/components/ui/button";
+import { Progress } from "@/components/ui/progress";
+import { useT } from "@/lib/i18n/context";
+import { cn } from "@/lib/utils";
+import { useConversionStore } from "@/stores/conversion-store";
+import type { ConversionStage } from "@/types/conversion";
+
+/* -------------------------------------------------------------------------- */
+/* stage 三段（順序固定，與 converter `stage` enum 一致）                       */
+/* -------------------------------------------------------------------------- */
+
+const STAGE_ORDER: readonly ConversionStage[] = ["onnx", "bie", "nef"] as const;
+
+type StageStatus = "completed" | "current" | "pending";
+
+/**
+ * 計算三段 stage 在當前 job 狀態下的視覺標記。
+ *
+ * 規則（任務描述）：
+ *   - status=queued                   → 全部 pending
+ *   - status=running, stage=onnx      → onnx=current,  bie/nef=pending
+ *   - status=running, stage=bie       → onnx=completed, bie=current, nef=pending
+ *   - status=running, stage=nef       → onnx=completed, bie=completed, nef=current
+ *   - status=running, stage=undefined → onnx=current（converter 還沒回 stage 欄位的 fallback）
+ */
+function computeStageStatuses(
+  uiState: "queued" | "running",
+  stage: ConversionStage | undefined,
+): readonly StageStatus[] {
+  if (uiState === "queued") {
+    return ["pending", "pending", "pending"];
+  }
+  // running
+  const currentIdx = stage ? STAGE_ORDER.indexOf(stage) : 0;
+  // 萬一 backend 回了未知 stage（理論上不會）→ 視為 onnx
+  const safeIdx = currentIdx >= 0 ? currentIdx : 0;
+  return STAGE_ORDER.map((_, idx) => {
+    if (idx < safeIdx) return "completed";
+    if (idx === safeIdx) return "current";
+    return "pending";
+  }) as readonly StageStatus[];
+}
+
+/* -------------------------------------------------------------------------- */
+/* hook：tab title 改成「(轉檔中) <原 title>」（mount/unmount 還原）              */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §3.3 「Tab title」)
+ *
+ * 設計：
+ *   - 第一次 mount 時鎖定 baseTitle（用 useRef，整個元件 lifecycle 不重抓）
+ *   - prefix 變化時（例：locale 切換 zh ↔ en）→ useEffect re-run：
+ *       cleanup 還原成 baseTitle → 重新 set 為「新 prefix + baseTitle」
+ *       不會讀到含舊 prefix 的 document.title 當 baseline → 避免「(Converting) (轉檔中) ⋯」累積
+ *   - unmount：還原 baseTitle
+ *
+ * 為什麼用 useRef 而非 useState：
+ *   - 鎖 baseTitle 不需要觸發 re-render
+ *   - useState 會把 baseTitle 當依賴或觸發 effect 重跑，反而把問題搞複雜
+ *
+ * 防進入時 document.title 已含本次 prefix（罕見：HMR 重 mount、雙分頁都可能撞）：
+ *   - 若 baseline 讀到時剛好以 `prefix` 開頭，剝掉 prefix 後再鎖（避免疊加）
+ */
+function useTabTitlePrefix(prefix: string): void {
+  const baseTitleRef = useRef<string | null>(null);
+
+  useEffect(() => {
+    if (typeof document === "undefined") return;
+
+    // 第一次 mount → 讀 base title 並鎖定。之後 prefix 變化（locale 切換）不再覆蓋
+    if (baseTitleRef.current === null) {
+      const initial = document.title;
+      // 進入時若已含本次 prefix，剝掉再鎖（防 HMR / 雙分頁殘留）
+      baseTitleRef.current = initial.startsWith(prefix)
+        ? initial.slice(prefix.length)
+        : initial;
+    }
+
+    const base = baseTitleRef.current;
+    document.title = `${prefix}${base}`;
+
+    return () => {
+      // cleanup：還原成 base（不還原當前 document.title — 因為 prefix 即將變化）
+      // unmount 時也走這條，把 prefix 移除
+      if (baseTitleRef.current !== null) {
+        document.title = baseTitleRef.current;
+      }
+    };
+  }, [prefix]);
+}
+
+/* -------------------------------------------------------------------------- */
+/* Component                                                                  */
+/* -------------------------------------------------------------------------- */
+
+export function ProcessingView() {
+  const t = useT();
+
+  // 訂閱 store（用獨立 selector 減少不必要 re-render）
+  const uiState = useConversionStore((s) => s.uiState);
+  const job = useConversionStore((s) => s.job);
+  // F-T9 sub-2 — 「您已有一個轉檔正在進行中，已切換至該任務」banner 用
+  // store flag 由 startConversion 收 409 active_job_exists 後設為 true（flow §6.1）
+  const switchedFromActiveJob = useConversionStore(
+    (s) => s.switchedFromActiveJob,
+  );
+
+  // banner 是否已被使用者 dismiss（local state；component unmount 重置 — 切回 idle 後再進
+  // processing 是不同 instance，理應重新顯示。store flag 還在 → banner 重新出現是預期行為）
+  const [bannerDismissed, setBannerDismissed] = useState(false);
+
+  // 只在 queued / running 才有意義；page.tsx 已做 routing，但保險
+  const phase: "queued" | "running" =
+    uiState === "running" ? "running" : "queued";
+
+  // tab title 標記（i18n 取 prefix；多語言下會自動切）
+  useTabTitlePrefix(t("conversion.processing.tabTitle.prefix"));
+
+  /* ---- 衍生資料 ---- */
+  const stageStatuses = useMemo(
+    () => computeStageStatuses(phase, job?.stage),
+    [phase, job?.stage],
+  );
+
+  // progress bar 顯示模式：
+  //   queued                       → "queued"     （隱藏 bar，顯示排隊文字）
+  //   running + progress 是 number → "determinate"（顯示 X%）
+  //   running + progress 是 null   → "indeterminate"（pulse + sr-only）
+  type ProgressMode = "queued" | "determinate" | "indeterminate";
+  const progress = job?.progress;
+  const progressMode: ProgressMode = useMemo(() => {
+    if (phase === "queued") return "queued";
+    if (typeof progress === "number" && Number.isFinite(progress)) {
+      return "determinate";
+    }
+    return "indeterminate";
+  }, [phase, progress]);
+
+  // ETA 文字：converter 不給 ETA → 不算，只顯示靜態提示
+  const etaText =
+    phase === "queued"
+      ? t("conversion.processing.eta.pending")
+      : t("conversion.processing.eta.computing");
+
+  // 來源檔名 + 目標 chip（job 必存在於此 view；保險 fallback 空字串）
+  const sourceFilename = job?.source_filename ?? "";
+  const targetChip = job?.target_chip ?? "";
+
+  /* ---- a11y ids ---- */
+  const headingId = useId();
+  const progressLabelId = useId();
+
+  // progress clamp：防 backend 回異常值（負數 / >100 / NaN 已被 Number.isFinite 擋掉）
+  const safeProgress = Math.max(0, Math.min(100, progress ?? 0));
+
+  // F-T9 sub-2 — 是否顯示「已切換至既存任務」banner
+  // 條件：store flag = true 且使用者尚未 dismiss
+  const showSwitchedBanner = switchedFromActiveJob && !bannerDismissed;
+
+  return (
+    <div
+      data-testid="conversion-processing-wrapper"
+      data-phase={phase}
+      className="space-y-4"
+    >
+      {/* F-T9 sub-2 — 「您已有一個轉檔正在進行中，已切換至該任務」banner（flow §6.1）
+          使用者可 dismiss（× 按鈕），dismiss 只清 local state；store.switchedFromActiveJob
+          flag 由 reset() 清除。下次再開新轉檔被 409 才會再次出現。 */}
+      {showSwitchedBanner ? (
+        <div
+          role="status"
+          aria-live="polite"
+          data-testid="processing-switched-banner"
+          className="border-info/30 bg-accent/40 text-accent-foreground flex items-start gap-3 rounded-md border p-3 text-sm"
+        >
+          <InfoIcon
+            aria-hidden="true"
+            className="mt-0.5 size-4 shrink-0 text-blue-600 dark:text-blue-400"
+          />
+          <span className="flex-1">
+            {t("conversion.processing.bannerExisting")}
+          </span>
+          <Button
+            type="button"
+            variant="ghost"
+            size="sm"
+            onClick={() => setBannerDismissed(true)}
+            aria-label={t("conversion.processing.bannerDismiss")}
+            data-testid="processing-switched-banner-dismiss"
+            className="h-6 w-6 shrink-0 p-0"
+          >
+            <XIcon aria-hidden="true" className="size-3.5" />
+          </Button>
+        </div>
+      ) : null}
+
+      <div
+        data-testid="conversion-processing"
+        data-phase={phase}
+        className="bg-card space-y-6 rounded-xl border p-6"
+      >
+      {/* 標題 + 副標 */}
+      <div className="space-y-1">
+        <h2 id={headingId} className="text-lg font-semibold">
+          {t("conversion.processing.cardHeading")}
+        </h2>
+        <p className="text-muted-foreground text-sm">
+          {t("conversion.processing.subtitle")}
+        </p>
+      </div>
+
+      {/* 檔名 → chip */}
+      {(sourceFilename || targetChip) && (
+        <div
+          className="flex flex-wrap items-center gap-x-2 gap-y-1 text-sm"
+          data-testid="processing-job-summary"
+        >
+          {sourceFilename ? (
+            <span className="font-mono" data-testid="processing-source-filename">
+              {sourceFilename}
+            </span>
+          ) : null}
+          {sourceFilename && targetChip ? (
+            <span aria-hidden="true" className="text-muted-foreground">
+              {t("conversion.processing.targetChipPrefix")}
+            </span>
+          ) : null}
+          {targetChip ? (
+            <span
+              className="bg-accent text-accent-foreground rounded px-2 py-0.5 text-xs font-medium"
+              data-testid="processing-target-chip"
+            >
+              {targetChip}
+            </span>
+          ) : null}
+        </div>
+      )}
+
+      {/* Stage indicator */}
+      <StageIndicator
+        statuses={stageStatuses}
+        labelText={t("conversion.processing.cardHeading")}
+      />
+
+      {/* Progress bar 區 */}
+      <div className="space-y-2">
+        {progressMode === "queued" ? (
+          /* queued — 用 indeterminate 視覺 + 排隊中文字 */
+          <div
+            data-testid="processing-progress-queued"
+            role="status"
+            aria-live="polite"
+            aria-label={t("conversion.processing.aria.queueProgress")}
+            className="space-y-2"
+          >
+            {/* 跑馬燈（pulse 視覺） — wireframe §6.2 建議：indeterminate 用 animate-pulse */}
+            <div
+              aria-hidden="true"
+              className={cn(
+                "bg-primary/20 relative h-2 w-full overflow-hidden rounded-full",
+                "motion-safe:animate-pulse",
+              )}
+            >
+              <div className="bg-primary/40 motion-reduce:bg-primary/30 absolute inset-y-0 left-0 w-1/3 rounded-full" />
+            </div>
+            <div className="flex items-center gap-2 text-sm">
+              <Loader2Icon
+                aria-hidden="true"
+                className="text-primary size-4 motion-safe:animate-spin"
+              />
+              <span data-testid="processing-queued-text">
+                {t("conversion.processing.queued")}
+              </span>
+            </div>
+          </div>
+        ) : progressMode === "determinate" ? (
+          /* running + 有 progress 百分比 */
+          <div className="space-y-2">
+            <span id={progressLabelId} className="sr-only">
+              {t("conversion.processing.processing")}
+            </span>
+            <Progress
+              value={safeProgress}
+              aria-labelledby={progressLabelId}
+              aria-valuemin={0}
+              aria-valuemax={100}
+              aria-valuenow={Math.round(safeProgress)}
+              data-testid="processing-progress-determinate"
+            />
+            <div
+              className="text-muted-foreground flex items-center justify-between text-sm"
+              aria-live="polite"
+            >
+              <span data-testid="processing-progress-pct">
+                {`${Math.round(safeProgress)}%`}
+              </span>
+              <span data-testid="processing-eta-text">{etaText}</span>
+            </div>
+          </div>
+        ) : (
+          /* running + progress=null → indeterminate */
+          <div
+            data-testid="processing-progress-indeterminate"
+            role="progressbar"
+            aria-valuemin={0}
+            aria-valuemax={100}
+            aria-busy="true"
+            aria-label={t("conversion.processing.aria.progressIndeterminate")}
+            className="space-y-2"
+          >
+            {/* 不確定百分比 — wireframe §6.2 建議：indeterminate 用 animate-pulse */}
+            <div
+              aria-hidden="true"
+              className={cn(
+                "bg-primary/20 relative h-2 w-full overflow-hidden rounded-full",
+                "motion-safe:animate-pulse",
+              )}
+            >
+              <div className="bg-primary motion-reduce:bg-primary/70 absolute inset-y-0 left-0 w-2/3 rounded-full" />
+            </div>
+            <div
+              className="text-muted-foreground flex items-center justify-between text-sm"
+              aria-live="polite"
+            >
+              <span data-testid="processing-progress-label">
+                {t("conversion.processing.processing")}
+              </span>
+              <span data-testid="processing-eta-text">{etaText}</span>
+            </div>
+          </div>
+        )}
+      </div>
+
+      {/* 7 天清除提醒 */}
+      <p
+        data-testid="processing-expiry-hint"
+        className="text-muted-foreground flex items-start gap-2 border-t pt-3 text-xs"
+      >
+        <InfoIcon aria-hidden="true" className="mt-0.5 size-4 flex-shrink-0" />
+        <span>{t("conversion.processing.expiryHint")}</span>
+      </p>
+      </div>
+    </div>
+  );
+}
+
+/* -------------------------------------------------------------------------- */
+/* StageIndicator — 三段式 stepper（自寫，元件庫沒 stepper）                    */
+/* -------------------------------------------------------------------------- */
+
+interface StageIndicatorProps {
+  /** 三段（順序對應 onnx / bie / nef） */
+  statuses: readonly StageStatus[];
+  /**
+   * 給 list 整體名稱（套用到 `aria-label`）。
+   * 註：原本同時有 `aria-labelledby` 指向外層 heading 的 id，但該 id 在 DOM 中沒有
+   * 對應元素 → SR 找不到 reference 元素時 `aria-labelledby` 等同沒設，
+   * 反而讓 `aria-label` 也被 override 為空。改純 `aria-label` 更可靠。
+   */
+  labelText: string;
+}
+
+function StageIndicator({ statuses, labelText }: StageIndicatorProps) {
+  const t = useT();
+
+  return (
+    <ol
+      role="list"
+      aria-label={labelText}
+      data-testid="processing-stage-indicator"
+      className="flex items-start justify-between gap-2 sm:gap-3"
+    >
+      {STAGE_ORDER.map((stage, idx) => {
+        const status = statuses[idx] ?? "pending";
+        const stageLabel = t(`conversion.processing.stage.${stage}`);
+        const statusLabel = t(
+          `conversion.processing.stage.status.${status}`,
+        );
+        // a11y label: e.g.「解析模型（已完成）」
+        const ariaLabel = t(
+          `conversion.processing.stage.aria.${status}`,
+        ).replace("{name}", stageLabel);
+
+        const isLast = idx === STAGE_ORDER.length - 1;
+        const nextCompleted = !isLast && statuses[idx + 1] === "completed";
+
+        return (
+          <li
+            key={stage}
+            role="listitem"
+            aria-label={ariaLabel}
+            aria-current={status === "current" ? "step" : undefined}
+            data-stage={stage}
+            data-status={status}
+            data-testid={`processing-stage-${stage}`}
+            className={cn(
+              "relative flex flex-1 flex-col items-center gap-2 text-center",
+              // 讓步驟之間有連線（除了最後一個）
+              !isLast &&
+                "after:bg-muted after:absolute after:top-4 after:left-[calc(50%+1.25rem)] after:h-0.5 after:w-[calc(100%-2.5rem)] after:content-['']",
+              // 已完成 → 後面那段連線變主色
+              !isLast &&
+                (status === "completed" || nextCompleted) &&
+                "after:bg-primary",
+            )}
+          >
+            {/* 圓圈 */}
+            <span
+              aria-hidden="true"
+              className={cn(
+                "flex size-8 items-center justify-center rounded-full border-2 text-sm font-semibold transition-colors",
+                status === "completed" &&
+                  "bg-primary border-primary text-primary-foreground",
+                status === "current" &&
+                  "border-primary text-primary bg-background ring-primary/30 ring-2 ring-offset-2",
+                status === "pending" &&
+                  "bg-muted border-muted text-muted-foreground",
+              )}
+            >
+              {status === "completed" ? (
+                <CheckIcon className="size-4" />
+              ) : status === "current" ? (
+                <Loader2Icon className="size-4 motion-safe:animate-spin" />
+              ) : (
+                idx + 1
+              )}
+            </span>
+
+            {/* 名稱 */}
+            <span
+              className={cn(
+                "text-xs sm:text-sm",
+                status === "current" && "text-foreground font-medium",
+                status === "completed" && "text-foreground",
+                status === "pending" && "text-muted-foreground",
+              )}
+            >
+              {stageLabel}
+            </span>
+
+            {/* 狀態（完成 / 進行中 / 待處理） */}
+            <span
+              className={cn(
+                "text-muted-foreground text-xs",
+                status === "current" && "text-primary font-medium",
+              )}
+            >
+              {statusLabel}
+            </span>
+          </li>
+        );
+      })}
+    </ol>
+  );
+}
diff --git a/visionA-frontend/src/app/conversion/components/PromoteDialog.tsx b/visionA-frontend/src/app/conversion/components/PromoteDialog.tsx
new file mode 100644
index 0000000..d425f4e
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/PromoteDialog.tsx
@@ -0,0 +1,318 @@
+"use client";
+
+/**
+ * PromoteDialog — 「加到模型庫」確認對話框
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §7.1)
+ *
+ * 對齊：
+ *   - flow-conversion.md §5.5「加到模型庫」分支（半自動，user 顯式確認名稱）
+ *   - api-conversion.md §3 promote-to-models（body 只送 name；description 留 Phase 1）
+ *   - feature-converter-integration.md §F6（同 job 重複呼叫 → 409 already_imported）
+ *
+ * 範圍（F-T7）：
+ *   - 預設 name = `{source_filename_stem}_{target_chip.lower()}`（flow §5.5 規則）
+ *   - 單一輸入欄位 name；驗證：必填 / ≤ 100 字元 / 不可含 `/` `\`
+ *   - 確認 → 呼叫 store.promoteToModels(name) → spinner + disable 兩按鈕
+ *   - 200 → 關 dialog + onSuccess(modelId)；toast 由 caller 在 onSuccess 處理（避免重複觸發）
+ *   - 409 already_imported → dialog 內顯示特殊錯誤；不關 dialog（user 可看到提示再選擇下一步）
+ *   - 其他錯誤 → dialog 內紅字顯示 + 仍可關閉重試
+ *   - Description 欄位 Phase 0.8 不收（PRD F6 + Design §7.1 共識）
+ *
+ * a11y：
+ *   - Radix Dialog 自帶 focus trap + ESC 關閉
+ *   - 確認按鈕 spinner 期間 aria-busy="true"
+ *   - 錯誤訊息 role="alert" + aria-live
+ *
+ * 不做：
+ *   - 多語言 url 拼裝（caller 拿到 model_id 自己決定要 navigate 還是顯示 toast 連結）
+ *   - 「前往該模型」連結內嵌（toast 由 SuccessView 統一處理）
+ */
+
+import { useId, useMemo, useState } from "react";
+
+import { Button } from "@/components/ui/button";
+import {
+  Dialog,
+  DialogContent,
+  DialogDescription,
+  DialogFooter,
+  DialogHeader,
+  DialogTitle,
+} from "@/components/ui/dialog";
+import { Input } from "@/components/ui/input";
+import { Label } from "@/components/ui/label";
+import { Spinner } from "@/components/ui/spinner";
+import { useT } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+import type { TargetChip } from "@/types/conversion";
+
+/** 對齊 PRD F6：name 上限 100 字元（與 backend schema 相容；wireframe §7.1 寫「最多 100 字元」） */
+const NAME_MAX_LENGTH = 100;
+/** 不允許的 path traversal 字元 */
+const INVALID_NAME_CHARS = /[/\\]/;
+
+/* -------------------------------------------------------------------------- */
+/* Helpers                                                                    */
+/* -------------------------------------------------------------------------- */
+
+/** 把 file 名稱去掉副檔名（yolov5s.onnx → yolov5s） */
+function stripExtension(filename: string): string {
+  const i = filename.lastIndexOf(".");
+  return i > 0 ? filename.slice(0, i) : filename;
+}
+
+/** 預設 model name = `{stem}_{chip.lower()}`（flow-conversion.md §5.5） */
+export function buildDefaultPromoteName(
+  sourceFilename: string,
+  chip: TargetChip,
+): string {
+  const stem = stripExtension(sourceFilename);
+  return `${stem}_${chip.toLowerCase()}`;
+}
+
+/* -------------------------------------------------------------------------- */
+/* Props                                                                      */
+/* -------------------------------------------------------------------------- */
+
+export interface PromoteDialogProps {
+  /** 是否開啟 */
+  open: boolean;
+  /** 開關狀態變更 — caller 自己 own 此 state */
+  onOpenChange: (open: boolean) => void;
+  /** 預設名稱（caller 從 job 算好傳進來；元件內部會再用 useState 跟使用者編輯結果） */
+  defaultName: string;
+  /** 給 dialog description 顯示用（無實際邏輯） */
+  targetChip: TargetChip;
+  /** Job id 顯示 short hash 用 */
+  jobId: string;
+  /** 成功時回呼；caller 用 model_id 跳頁 / 顯示 toast */
+  onSuccess: (modelId: string) => void;
+}
+
+/* -------------------------------------------------------------------------- */
+/* Component                                                                  */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * Outer wrapper — 把 inner state hooks 包到 `open=true` 才會 mount 的 inner 元件，
+ * 達成「每次開 dialog 重置 name」的效果（取代 useEffect+setState pattern）。
+ *
+ * 原理：Radix Dialog 在 `open=false` 時不掛 Portal/Content，但本元件外層仍需要保持
+ * mount（接收 onOpenChange 訊號）。把 stateful inner 拆出來只在 open=true 才 mount，
+ * 即可確保 useState lazy init 每次都拿到最新 defaultName。
+ */
+export function PromoteDialog(props: PromoteDialogProps) {
+  return (
+    <Dialog
+      open={props.open}
+      onOpenChange={(next) => props.onOpenChange(next)}
+    >
+      {props.open ? <PromoteDialogInner {...props} /> : null}
+    </Dialog>
+  );
+}
+
+function PromoteDialogInner({
+  onOpenChange,
+  defaultName,
+  targetChip,
+  jobId,
+  onSuccess,
+}: PromoteDialogProps) {
+  const t = useT();
+  const promoteToModels = useConversionStore((s) => s.promoteToModels);
+
+  // lazy init：每次 inner 重新 mount（即每次 dialog 開啟）都用最新 defaultName
+  const [name, setName] = useState(defaultName);
+  const [submitting, setSubmitting] = useState(false);
+  /** dialog 內顯示的錯誤訊息（已翻譯） */
+  const [errorMessage, setErrorMessage] = useState<string | null>(null);
+
+  /* ---- 前端驗證 ---- */
+  const trimmedName = name.trim();
+  const validationError = useMemo<string | null>(() => {
+    if (!trimmedName) {
+      return t("conversion.success.import.dialog.nameError.required");
+    }
+    if (trimmedName.length > NAME_MAX_LENGTH) {
+      return t("conversion.success.import.dialog.nameError.tooLong");
+    }
+    if (INVALID_NAME_CHARS.test(trimmedName)) {
+      return t("conversion.success.import.dialog.nameError.invalidChars");
+    }
+    return null;
+  }, [trimmedName, t]);
+
+  // 顯示用：服務端錯誤優先；否則才顯示驗證錯誤（且只在 user 已輸入過 / 嘗試 submit 時顯示）
+  const [showValidation, setShowValidation] = useState(false);
+  const visibleError = errorMessage ?? (showValidation ? validationError : null);
+
+  /* ---- ids ---- */
+  const titleId = useId();
+  const descId = useId();
+  const nameInputId = useId();
+  const nameErrorId = useId();
+  const nameHintId = useId();
+
+  /* ---- handlers ---- */
+  const handleNameChange = (e: React.ChangeEvent<HTMLInputElement>) => {
+    setName(e.target.value);
+    // 服務端錯誤在使用者重新編輯後清掉（讓 user 知道編輯後會重試）
+    if (errorMessage) setErrorMessage(null);
+  };
+
+  const handleSubmit = async () => {
+    setShowValidation(true);
+    if (validationError) return;
+    if (submitting) return;
+
+    setSubmitting(true);
+    setErrorMessage(null);
+
+    try {
+      const result = await promoteToModels(trimmedName);
+      // 成功 — caller 處理後續（toast / 跳頁）
+      onSuccess(result.model_id);
+      onOpenChange(false);
+    } catch (err) {
+      // store 在 promote 失敗時會把 error 寫進 store；但這裡用 throw 拿 code 做特殊處理
+      const code = (err as { code?: string } | undefined)?.code ?? "unknown";
+      // 對齊 wireframe §7.1：409 already_imported / job_not_completed → 對應 i18n
+      // 沒符合的 → fallback errorGeneric
+      let i18nKey: string;
+      if (code === "active_job_exists" || code === "already_imported") {
+        // backend Phase 0.8 文件用 409 已加入過模型庫 → conversion.md §6 對應 i18n key
+        i18nKey = "conversion.success.import.toastDup";
+      } else {
+        i18nKey = "conversion.success.import.errorGeneric";
+      }
+      setErrorMessage(t(i18nKey));
+      setSubmitting(false);
+    }
+  };
+
+  const handleCancel = () => {
+    if (submitting) return;
+    onOpenChange(false);
+  };
+
+  /* ---- 衍生顯示資料 ---- */
+  const shortJobId = jobId.slice(0, 8);
+  const sourceValue = t("conversion.success.import.dialog.sourceValue").replace(
+    "{shortJobId}",
+    shortJobId,
+  );
+  const dialogDescription = t(
+    "conversion.success.import.dialog.description",
+  ).replace("{chip}", targetChip);
+
+  return (
+    <DialogContent
+      aria-labelledby={titleId}
+      aria-describedby={descId}
+      data-testid="promote-dialog"
+      className="max-w-md"
+      // 上傳中阻擋 ESC / outside click 關閉 dialog（與既有 model-upload-dialog 風格一致）
+      onEscapeKeyDown={(e) => submitting && e.preventDefault()}
+      onPointerDownOutside={(e) => submitting && e.preventDefault()}
+    >
+        <DialogHeader>
+          <DialogTitle id={titleId}>
+            {t("conversion.success.import.dialog.title")}
+          </DialogTitle>
+          <DialogDescription id={descId}>{dialogDescription}</DialogDescription>
+        </DialogHeader>
+
+        <form
+          onSubmit={(e) => {
+            e.preventDefault();
+            void handleSubmit();
+          }}
+          className="space-y-4"
+        >
+          {/* name 欄位 */}
+          <div className="space-y-2">
+            <Label htmlFor={nameInputId}>
+              {t("conversion.success.import.dialog.nameLabel")}
+              <span aria-hidden="true" className="text-destructive ml-0.5">
+                *
+              </span>
+            </Label>
+            <Input
+              id={nameInputId}
+              data-testid="promote-dialog-name"
+              value={name}
+              onChange={handleNameChange}
+              maxLength={NAME_MAX_LENGTH + 1 /* 多 1 讓使用者看到「太長」錯誤 */}
+              autoComplete="off"
+              autoFocus
+              required
+              disabled={submitting}
+              aria-invalid={visibleError ? true : undefined}
+              aria-describedby={
+                visibleError ? `${nameErrorId} ${nameHintId}` : nameHintId
+              }
+            />
+            <p id={nameHintId} className="text-muted-foreground text-xs">
+              {t("conversion.success.import.dialog.nameHint")}
+            </p>
+            {visibleError ? (
+              <p
+                id={nameErrorId}
+                role="alert"
+                aria-live="polite"
+                className="text-destructive text-sm"
+                data-testid="promote-dialog-error"
+              >
+                {visibleError}
+              </p>
+            ) : null}
+          </div>
+
+          {/* 來源 — 只讀顯示，不收使用者輸入 */}
+          <div className="text-muted-foreground space-y-1 text-xs">
+            <p>
+              <span className="font-medium">
+                {t("conversion.success.import.dialog.sourceLabel")}：
+              </span>
+              {sourceValue}
+            </p>
+            <p>
+              <span className="font-medium">
+                {t("conversion.success.summary.chip")}：
+              </span>
+              {targetChip}
+            </p>
+          </div>
+
+          <DialogFooter>
+            <Button
+              type="button"
+              variant="outline"
+              onClick={handleCancel}
+              disabled={submitting}
+              data-testid="promote-dialog-cancel"
+            >
+              {t("conversion.success.import.dialog.cancel")}
+            </Button>
+            <Button
+              type="submit"
+              disabled={submitting}
+              aria-busy={submitting}
+              data-testid="promote-dialog-confirm"
+            >
+              {submitting ? (
+                <>
+                  <Spinner size="sm" className="mr-2" />
+                  {t("conversion.success.import.processing")}
+                </>
+              ) : (
+                t("conversion.success.import.dialog.confirm")
+              )}
+            </Button>
+          </DialogFooter>
+        </form>
+    </DialogContent>
+  );
+}
diff --git a/visionA-frontend/src/app/conversion/components/SuccessView.test.tsx b/visionA-frontend/src/app/conversion/components/SuccessView.test.tsx
new file mode 100644
index 0000000..37dbb08
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/SuccessView.test.tsx
@@ -0,0 +1,534 @@
+/**
+ * SuccessView 單元測試（Phase 0.8 F-T7）
+ *
+ * 對齊：
+ *   - wireframe-conversion.md §3.4 + §7.1（Success state 視覺 + import dialog）
+ *   - flow-conversion.md §5.5 succeeded → 兩按鈕半自動分支
+ *   - api-conversion.md §3 / §4
+ *
+ * 覆蓋：
+ *   - 成功 hero 顯示 title / 描述
+ *   - 任務摘要：source filename / target chip / output filename / size / checksum
+ *   - 「下載」<a> href = /api/conversion/{jobId}/download
+ *   - 「加到模型庫」開 PromoteDialog，預設 name = stem_chip
+ *   - PromoteDialog 確認 → 呼叫 store.promoteToModels(name) → toast 顯示
+ *   - PromoteDialog 409 already_imported / active_job_exists → 顯示特殊錯誤訊息
+ *   - 「開始新轉檔」呼叫 store.reset
+ *   - 7 天倒數顯示（mock now / Date.parse）
+ *   - 過期當下：兩按鈕 disabled、提示文字切「已過期」
+ *
+ * Mock 策略：
+ *   - sonner toast → vi.mock 攔截 toast.success
+ *   - store.promoteToModels / reset → vi.spyOn
+ *   - Date.now → vi.useFakeTimers + setSystemTime
+ */
+
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import {
+  afterEach,
+  beforeEach,
+  describe,
+  expect,
+  it,
+  vi,
+  type Mock,
+} from "vitest";
+
+import { ConversionAPIError } from "@/lib/api/conversion";
+import { LocaleProvider } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+import type { ConversionJob } from "@/types/conversion";
+
+import { SuccessView } from "./SuccessView";
+
+/* -------------------------------------------------------------------------- */
+/* Mock sonner — 攔截 toast.success 的呼叫                                     */
+/* -------------------------------------------------------------------------- */
+
+vi.mock("sonner", () => {
+  const success = vi.fn();
+  const error = vi.fn();
+  const warning = vi.fn();
+  const info = vi.fn();
+  return {
+    toast: Object.assign(
+      vi.fn(),
+      { success, error, warning, info },
+    ),
+  };
+});
+
+import { toast } from "sonner";
+
+/* -------------------------------------------------------------------------- */
+/* Mock next/navigation — useRouter 在 jsdom 下無 app router context           */
+/* -------------------------------------------------------------------------- */
+
+const mockRouterPush = vi.fn();
+
+vi.mock("next/navigation", () => ({
+  useRouter: () => ({
+    push: mockRouterPush,
+    replace: vi.fn(),
+    back: vi.fn(),
+    forward: vi.fn(),
+    refresh: vi.fn(),
+    prefetch: vi.fn(),
+  }),
+}));
+
+/* -------------------------------------------------------------------------- */
+/* Helpers                                                                    */
+/* -------------------------------------------------------------------------- */
+
+function makeSuccessJob(
+  overrides: Partial<ConversionJob> = {},
+): ConversionJob {
+  return {
+    job_id: "abcdef12-3456-7890-aaaa-bbbbccccdddd",
+    status: "succeeded",
+    source_filename: "yolov5s.onnx",
+    target_chip: "KL720",
+    created_at: "2026-04-30T12:00:00Z",
+    expires_at: "2026-05-07T12:00:00Z",
+    result: {
+      output_size_bytes: 12_300_000,
+      output_checksum: "sha256:a1b2c3d4e5f60718293a4b5c6d7e8f90",
+    },
+    ...overrides,
+  };
+}
+
+function setSucceeded(job: ConversionJob = makeSuccessJob()) {
+  useConversionStore.setState({
+    uiState: "succeeded",
+    job,
+  });
+}
+
+function renderView() {
+  return render(
+    <LocaleProvider>
+      <SuccessView />
+    </LocaleProvider>,
+  );
+}
+
+/* -------------------------------------------------------------------------- */
+/* Lifecycle                                                                  */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * 鎖定 Date.now 到 2026-04-30T12:00:00Z（與 makeSuccessJob 的 created_at 一致；
+ * 配合 expires_at 預設 +7d 算出「剩 7 天」）。
+ *
+ * **不**用 vi.useFakeTimers — fake timers 會把 setTimeout / Promise microtask 鎖住，
+ * 與 Testing Library 的 waitFor 不相容（waitFor 要等 real timer）。改用 spyOn(Date, "now")
+ * 只攔 Date.now 即可（其他 setInterval 在元件 unmount 時 cleanup，不影響）。
+ */
+const NOW_FIXED = new Date("2026-04-30T12:00:00Z").getTime();
+
+beforeEach(() => {
+  vi.spyOn(Date, "now").mockReturnValue(NOW_FIXED);
+  useConversionStore.getState().reset();
+  (toast.success as Mock).mockReset();
+  mockRouterPush.mockReset();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  useConversionStore.getState().reset();
+});
+
+/* -------------------------------------------------------------------------- */
+/* 基本渲染                                                                    */
+/* -------------------------------------------------------------------------- */
+
+describe("<SuccessView /> — 基本渲染", () => {
+  it("顯示成功 hero、任務摘要、兩按鈕、開始新轉檔", () => {
+    setSucceeded();
+    renderView();
+
+    // 成功 hero
+    expect(screen.getByTestId("success-hero")).toBeTruthy();
+    expect(screen.getByTestId("success-description").textContent).toContain(
+      "yolov5s.onnx",
+    );
+    expect(screen.getByTestId("success-description").textContent).toContain(
+      "KL720",
+    );
+
+    // 任務摘要
+    expect(
+      screen.getByTestId("success-source-filename").textContent,
+    ).toContain("yolov5s.onnx");
+    expect(screen.getByTestId("success-target-chip").textContent).toContain(
+      "KL720",
+    );
+    expect(screen.getByTestId("success-output-filename").textContent).toContain(
+      "yolov5s_kl720.nef",
+    );
+    expect(screen.getByTestId("success-output-size").textContent).toContain(
+      "MB",
+    );
+
+    // 兩按鈕 + 開始新轉檔
+    expect(screen.getByTestId("success-import-button")).toBeTruthy();
+    expect(screen.getByTestId("success-download-button")).toBeTruthy();
+    expect(screen.getByTestId("success-start-new")).toBeTruthy();
+  });
+
+  it("顯示 checksum 前 16 字元（含 sha256: 前綴）", () => {
+    setSucceeded();
+    renderView();
+    const cs = screen.getByTestId("success-output-checksum").textContent ?? "";
+    expect(cs.startsWith("sha256:")).toBe(true);
+    // 前綴 + 16 字 + 「…」
+    expect(cs.endsWith("…")).toBe(true);
+    // checksum 不應該整段 raw 顯示（避免太長）
+    expect(cs.length).toBeLessThan("sha256:a1b2c3d4e5f60718293a4b5c6d7e8f90".length);
+  });
+
+  it("checksum 為空時不顯示該行", () => {
+    setSucceeded(
+      makeSuccessJob({
+        result: { output_size_bytes: 12_300_000 },
+      }),
+    );
+    renderView();
+    expect(screen.queryByTestId("success-output-checksum")).toBeNull();
+    // size 仍然顯示
+    expect(screen.getByTestId("success-output-size")).toBeTruthy();
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* 下載按鈕                                                                    */
+/* -------------------------------------------------------------------------- */
+
+describe("<SuccessView /> — 下載按鈕", () => {
+  it("「下載」<a> href 指向 /api/conversion/{jobId}/download", () => {
+    setSucceeded();
+    renderView();
+
+    const button = screen.getByTestId("success-download-button");
+    // asChild + <a> — DOM 上是 anchor
+    const anchor =
+      button.tagName.toLowerCase() === "a"
+        ? (button as HTMLAnchorElement)
+        : (button.querySelector("a") as HTMLAnchorElement | null);
+    expect(anchor).toBeTruthy();
+    expect(anchor!.getAttribute("href")).toBe(
+      "/api/conversion/abcdef12-3456-7890-aaaa-bbbbccccdddd/download",
+    );
+    expect(anchor!.hasAttribute("download")).toBe(true);
+  });
+
+  it("點下載 → 顯示「下載已開始」toast", () => {
+    setSucceeded();
+    renderView();
+
+    const button = screen.getByTestId("success-download-button");
+    fireEvent.click(button);
+
+    expect(toast.success as Mock).toHaveBeenCalledTimes(1);
+    const [msg] = (toast.success as Mock).mock.calls[0];
+    expect(typeof msg).toBe("string");
+    expect((msg as string).length).toBeGreaterThan(0);
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* 加到模型庫 — PromoteDialog                                                   */
+/* -------------------------------------------------------------------------- */
+
+describe("<SuccessView /> — 加到模型庫", () => {
+  it("點按鈕 → 開啟 PromoteDialog，預設 name = stem_chip", () => {
+    setSucceeded();
+    renderView();
+
+    expect(screen.queryByTestId("promote-dialog")).toBeNull();
+
+    fireEvent.click(screen.getByTestId("success-import-button"));
+
+    const dialog = screen.getByTestId("promote-dialog");
+    expect(dialog).toBeTruthy();
+
+    const nameInput = screen.getByTestId(
+      "promote-dialog-name",
+    ) as HTMLInputElement;
+    expect(nameInput.value).toBe("yolov5s_kl720");
+  });
+
+  it("確認 → 呼叫 store.promoteToModels(trimmedName)，成功後 toast 顯示", async () => {
+    setSucceeded();
+    const promoteSpy = vi
+      .spyOn(useConversionStore.getState(), "promoteToModels")
+      .mockResolvedValue({ model_id: "model-xyz" });
+
+    renderView();
+    fireEvent.click(screen.getByTestId("success-import-button"));
+
+    // 改個名再 submit
+    const input = screen.getByTestId("promote-dialog-name") as HTMLInputElement;
+    fireEvent.change(input, { target: { value: "  my_model  " } });
+
+    fireEvent.click(screen.getByTestId("promote-dialog-confirm"));
+
+    await waitFor(() => {
+      expect(promoteSpy).toHaveBeenCalledWith("my_model");
+    });
+
+    // 成功 toast 顯示
+    await waitFor(() => {
+      expect(toast.success as Mock).toHaveBeenCalled();
+    });
+
+    // dialog 關閉
+    await waitFor(() => {
+      expect(screen.queryByTestId("promote-dialog")).toBeNull();
+    });
+  });
+
+  it("名稱為空 → 顯示驗證錯誤、不打 API", () => {
+    setSucceeded();
+    const promoteSpy = vi
+      .spyOn(useConversionStore.getState(), "promoteToModels")
+      .mockResolvedValue({ model_id: "model-xyz" });
+
+    renderView();
+    fireEvent.click(screen.getByTestId("success-import-button"));
+
+    const input = screen.getByTestId("promote-dialog-name") as HTMLInputElement;
+    fireEvent.change(input, { target: { value: "   " } });
+
+    fireEvent.click(screen.getByTestId("promote-dialog-confirm"));
+
+    expect(promoteSpy).not.toHaveBeenCalled();
+    expect(screen.getByTestId("promote-dialog-error")).toBeTruthy();
+  });
+
+  it("名稱含 / → 顯示驗證錯誤", () => {
+    setSucceeded();
+    const promoteSpy = vi
+      .spyOn(useConversionStore.getState(), "promoteToModels")
+      .mockResolvedValue({ model_id: "x" });
+
+    renderView();
+    fireEvent.click(screen.getByTestId("success-import-button"));
+
+    fireEvent.change(screen.getByTestId("promote-dialog-name"), {
+      target: { value: "../etc/passwd" },
+    });
+    fireEvent.click(screen.getByTestId("promote-dialog-confirm"));
+
+    expect(promoteSpy).not.toHaveBeenCalled();
+    const err = screen.getByTestId("promote-dialog-error");
+    expect(err.textContent).toBeTruthy();
+  });
+
+  it("backend 回 active_job_exists / 409 → dialog 內顯示「已加入過」訊息", async () => {
+    setSucceeded();
+    vi.spyOn(useConversionStore.getState(), "promoteToModels").mockRejectedValue(
+      new ConversionAPIError(409, "active_job_exists", "already imported"),
+    );
+
+    renderView();
+    fireEvent.click(screen.getByTestId("success-import-button"));
+    fireEvent.click(screen.getByTestId("promote-dialog-confirm"));
+
+    await waitFor(() => {
+      expect(screen.getByTestId("promote-dialog-error")).toBeTruthy();
+    });
+
+    // dialog 不關閉
+    expect(screen.getByTestId("promote-dialog")).toBeTruthy();
+  });
+
+  it("backend 其他錯誤 → 顯示通用錯誤訊息", async () => {
+    setSucceeded();
+    vi.spyOn(useConversionStore.getState(), "promoteToModels").mockRejectedValue(
+      new ConversionAPIError(500, "internal", "boom"),
+    );
+
+    renderView();
+    fireEvent.click(screen.getByTestId("success-import-button"));
+    fireEvent.click(screen.getByTestId("promote-dialog-confirm"));
+
+    await waitFor(() => {
+      const err = screen.getByTestId("promote-dialog-error");
+      expect(err.textContent).toBeTruthy();
+    });
+  });
+
+  it("spinner 期間：cancel 按鈕 disabled、嘗試關閉不生效（dialog 仍 visible）", async () => {
+    setSucceeded();
+    // 用一個永遠不 resolve 的 promise 鎖定 spinner 狀態
+    let _resolve: (v: { model_id: string }) => void = () => {};
+    const pending = new Promise<{ model_id: string }>((resolve) => {
+      _resolve = resolve;
+    });
+    vi.spyOn(useConversionStore.getState(), "promoteToModels").mockReturnValue(
+      pending,
+    );
+
+    renderView();
+    fireEvent.click(screen.getByTestId("success-import-button"));
+    fireEvent.click(screen.getByTestId("promote-dialog-confirm"));
+
+    // 等到 confirm button 進入 spinner 狀態（aria-busy）
+    await waitFor(() => {
+      const confirmBtn = screen.getByTestId(
+        "promote-dialog-confirm",
+      ) as HTMLButtonElement;
+      expect(confirmBtn.getAttribute("aria-busy")).toBe("true");
+      expect(confirmBtn.disabled).toBe(true);
+    });
+
+    // cancel 按鈕也應 disabled
+    const cancelBtn = screen.getByTestId(
+      "promote-dialog-cancel",
+    ) as HTMLButtonElement;
+    expect(cancelBtn.disabled).toBe(true);
+
+    // 嘗試點 cancel → 因為 disabled，dialog 不會關
+    fireEvent.click(cancelBtn);
+
+    // dialog 仍 visible
+    expect(screen.getByTestId("promote-dialog")).toBeTruthy();
+
+    // 順便驗 ESC / outside click 在 component 內也都被 e.preventDefault 擋掉
+    // （已在 PromoteDialog onEscapeKeyDown / onPointerDownOutside 攔下）
+    // 這裡用 cancel 路徑驗證 spinner 期間「無法 close」的核心保證已足夠
+
+    // 收尾：resolve pending 讓元件 cleanup（避免 act warning）
+    _resolve({ model_id: "after-test" });
+  });
+
+  it("成功 toast 的 action onClick → 透過 next/navigation router.push 導向 /models/{id}（不用 location.href）", async () => {
+    setSucceeded();
+    vi.spyOn(useConversionStore.getState(), "promoteToModels").mockResolvedValue(
+      { model_id: "m-router-1" },
+    );
+
+    renderView();
+    fireEvent.click(screen.getByTestId("success-import-button"));
+    fireEvent.click(screen.getByTestId("promote-dialog-confirm"));
+
+    // 等 toast.success 被呼叫，並拿到 action.onClick
+    await waitFor(() => {
+      expect(toast.success as Mock).toHaveBeenCalled();
+    });
+    const call = (toast.success as Mock).mock.calls[0];
+    const opts = call[1] as { action?: { onClick?: () => void } } | undefined;
+    expect(opts?.action?.onClick).toBeTypeOf("function");
+
+    // 觸發 action onClick → 應 push 到模型詳細頁，而不是 hard reload
+    opts!.action!.onClick!();
+    expect(mockRouterPush).toHaveBeenCalledWith("/models/m-router-1");
+  });
+
+  it("成功後重新點按鈕 → 顯示 statusDone label 而非 cta label", async () => {
+    setSucceeded();
+    vi.spyOn(useConversionStore.getState(), "promoteToModels").mockResolvedValue(
+      { model_id: "m1" },
+    );
+
+    renderView();
+    fireEvent.click(screen.getByTestId("success-import-button"));
+    fireEvent.click(screen.getByTestId("promote-dialog-confirm"));
+
+    await waitFor(() => {
+      expect(screen.queryByTestId("promote-dialog")).toBeNull();
+    });
+
+    // import 按鈕的文字應該包含「已加入」字樣（中文 ✓ 已加入 / 英文 ✓ Added）
+    const btn = screen.getByTestId("success-import-button");
+    const text = btn.textContent ?? "";
+    expect(/已加入|Added/.test(text)).toBe(true);
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* 開始新轉檔                                                                  */
+/* -------------------------------------------------------------------------- */
+
+describe("<SuccessView /> — 開始新轉檔", () => {
+  it("點「開始新轉檔」→ 呼叫 store.reset", () => {
+    setSucceeded();
+    const resetSpy = vi.spyOn(useConversionStore.getState(), "reset");
+
+    renderView();
+    fireEvent.click(screen.getByTestId("success-start-new"));
+
+    expect(resetSpy).toHaveBeenCalled();
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* 7 天倒數 + 過期                                                              */
+/* -------------------------------------------------------------------------- */
+
+describe("<SuccessView /> — expiry countdown", () => {
+  it("剩 6 天 23 小時時，zh-Hant 顯示「6 天 23 小時」（locale 純中文，不含 / en mix）", () => {
+    // now = 2026-04-30T12:00:00Z；expires = 2026-05-07T11:00:00Z（剩 6 天 23 小時）
+    setSucceeded(
+      makeSuccessJob({ expires_at: "2026-05-07T11:00:00Z" }),
+    );
+    renderView();
+
+    const hint = screen.getByTestId("success-expiry-hint").textContent ?? "";
+    // 6 天 23 小時 — 中文 locale 應該只看到中文，不應包含 「6d 23h」這種英文字串
+    expect(hint).toContain("6 天");
+    expect(hint).toContain("23 小時");
+    // 不該再有「{n} 天 {n} 小時 / {n}d {n}h」雙語混塞 pattern（m4 已修）
+    expect(/\d+d\s*\d+h/.test(hint)).toBe(false);
+  });
+
+  it("已過期：兩按鈕都是真實 disabled <button> / 文字切「已過期」", () => {
+    // now = 2026-04-30T12:00:00Z；expires 在過去
+    setSucceeded(
+      makeSuccessJob({ expires_at: "2026-04-29T12:00:00Z" }),
+    );
+    renderView();
+
+    const importBtn = screen.getByTestId("success-import-button");
+    const downloadBtn = screen.getByTestId("success-download-button");
+
+    // 兩按鈕都應該是 <button disabled>（不是 <a aria-disabled>），確保：
+    // 1. keyboard 可 focus（disabled button 仍在 tab order 中可被 SR 讀到）
+    // 2. SR 拿到 native disabled 語意
+    // 3. 沒有 race condition（不會在 mousedown→mouseup 之間突然從 a→button 改變）
+    expect(importBtn.tagName.toLowerCase()).toBe("button");
+    expect(downloadBtn.tagName.toLowerCase()).toBe("button");
+    expect((importBtn as HTMLButtonElement).disabled).toBe(true);
+    expect((downloadBtn as HTMLButtonElement).disabled).toBe(true);
+
+    // 提示文字
+    const hint = screen.getByTestId("success-expiry-hint").textContent ?? "";
+    expect(/已過期|expired/i.test(hint)).toBe(true);
+  });
+
+  it("已過期：download 按鈕沒有 href（避免 user 誤點）", () => {
+    setSucceeded(
+      makeSuccessJob({ expires_at: "2026-04-29T12:00:00Z" }),
+    );
+    renderView();
+
+    const downloadBtn = screen.getByTestId("success-download-button");
+    // disabled <button> 不會渲染成 anchor，hasAttribute("href") 永遠 false
+    expect(downloadBtn.hasAttribute("href")).toBe(false);
+    // 也不會有殘留的子 anchor（過期分支整個改用 button 渲染）
+    expect(downloadBtn.querySelector("a")).toBeNull();
+  });
+
+  it("data-expired 屬性反映過期狀態", () => {
+    setSucceeded(
+      makeSuccessJob({ expires_at: "2026-04-29T12:00:00Z" }),
+    );
+    renderView();
+    expect(
+      screen.getByTestId("conversion-success").getAttribute("data-expired"),
+    ).toBe("true");
+  });
+});
diff --git a/visionA-frontend/src/app/conversion/components/SuccessView.tsx b/visionA-frontend/src/app/conversion/components/SuccessView.tsx
new file mode 100644
index 0000000..533f10c
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/SuccessView.tsx
@@ -0,0 +1,540 @@
+"use client";
+
+/**
+ * SuccessView — Succeeded state（轉檔完成、半自動結果處理）
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §3.4 + §7.1)
+ *
+ * 對齊：
+ *   - flow-conversion.md §5.5 succeeded → 兩按鈕半自動分支（user 顯式選擇）
+ *   - feature-converter-integration.md F4 / F6 / F7
+ *   - api-conversion.md §3 promote-to-models + §4 download
+ *   - lib/api/conversion.ts `getConversionDownloadURL`（純字串組裝）
+ *
+ * 範圍（F-T7）：
+ *   - 成功 hero（綠色 ✓ + 「轉檔完成」title）
+ *   - 任務摘要 card：source filename → target chip、輸出檔名、輸出大小、checksum 前 16 字元
+ *   - 「加到模型庫」按鈕 → 開 PromoteDialog；確認後呼叫 store.promoteToModels
+ *   - 「下載」按鈕 → `<a href download>` 直連 backend GET /api/conversion/{job_id}/download
+ *   - 兩按鈕互不互斥、視覺平衡（同樣 size / 同樣 weight）
+ *   - 7 天倒數提醒（每分鐘 update 一次；過期當下自動切視覺）
+ *   - 「開始新轉檔」按鈕 → store.reset()
+ *
+ * 不做：
+ *   - 「下載」拿到錯誤的 fallback fetch + status 偵測（任務指定方法 1，靠 browser navigation 處理錯誤頁）
+ *   - 多語言「描述」欄位（Phase 1）
+ *
+ * a11y：
+ *   - 兩按鈕同等視覺權重（aria-label 各自描述具體行為）
+ *   - PromoteDialog 內建 focus trap（Radix）
+ *   - Toast 由 sonner 自帶 aria-live
+ *   - 過期提醒 role="status" + aria-live="polite"
+ */
+
+import { CheckCircle2Icon, DownloadIcon, LibraryIcon } from "lucide-react";
+import { useRouter } from "next/navigation";
+import { useEffect, useMemo, useState } from "react";
+import { toast } from "sonner";
+
+import { Button } from "@/components/ui/button";
+import { getConversionDownloadURL } from "@/lib/api/conversion";
+import { useT } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+import type { ConversionJob } from "@/types/conversion";
+
+import { PromoteDialog, buildDefaultPromoteName } from "./PromoteDialog";
+
+/** 倒數每分鐘更新一次（wireframe §7.1：「每分鐘 update 一次」） */
+const COUNTDOWN_TICK_MS = 60_000;
+/** Checksum 顯示前綴長度（wireframe §3.4：「前 16 字元」） */
+const CHECKSUM_DISPLAY_PREFIX = 16;
+
+/* -------------------------------------------------------------------------- */
+/* Helpers                                                                    */
+/* -------------------------------------------------------------------------- */
+
+/** bytes → 人類可讀（B / KB / MB / GB） */
+function formatBytes(bytes: number): string {
+  if (!Number.isFinite(bytes) || bytes <= 0) return "—";
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
+  if (bytes < 1024 * 1024 * 1024) {
+    return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
+  }
+  return `${(bytes / (1024 * 1024 * 1024)).toFixed(2)} GB`;
+}
+
+/** 把 file 名稱去掉副檔名（yolov5s.onnx → yolov5s） */
+function stripExtension(filename: string): string {
+  const i = filename.lastIndexOf(".");
+  return i > 0 ? filename.slice(0, i) : filename;
+}
+
+/** 推算輸出檔名（converter Phase 0.8 不直接給 output_filename，依約定組） */
+function buildOutputFilename(
+  sourceFilename: string,
+  chip: string,
+): string {
+  const stem = stripExtension(sourceFilename);
+  return `${stem}_${chip.toLowerCase()}.nef`;
+}
+
+/**
+ * checksum 顯示：sha256:abcd... 取前 N 字元 + ...
+ *
+ * checksum 通常已是 hex（無 prefix）或 `sha256:hex`；兩者都接受。
+ */
+function formatChecksum(raw: string | undefined): string | null {
+  if (!raw) return null;
+  if (raw.length <= CHECKSUM_DISPLAY_PREFIX) return raw;
+  // 取「：」後的部分截斷（保留 sha256: 前綴更易讀）
+  const colonIdx = raw.indexOf(":");
+  if (colonIdx > 0 && colonIdx < raw.length - 1) {
+    const prefix = raw.slice(0, colonIdx + 1);
+    const rest = raw.slice(colonIdx + 1);
+    return `${prefix}${rest.slice(0, CHECKSUM_DISPLAY_PREFIX)}…`;
+  }
+  return `${raw.slice(0, CHECKSUM_DISPLAY_PREFIX)}…`;
+}
+
+/**
+ * 把「剩餘毫秒」轉成 locale 對應字串：
+ *   - zh-Hant：「6 天 23 小時」/「23 小時 45 分鐘」/「45 分鐘」
+ *   - en：「6d 23h」/「23h 45m」/「45m」
+ *
+ * 對齊 wireframe §3.4：粒度只到分鐘，不顯示秒。
+ *
+ * 每個分支用獨立 i18n key（避免把中英文塞同一字串），templates 含 `{days}` /
+ * `{hours}` / `{minutes}` 三種佔位符。
+ */
+function formatRemainingTime(ms: number, t: (key: string) => string): string {
+  if (ms <= 0) return t("conversion.success.expiry.remaining.minutes").replace("{minutes}", "0");
+  const totalMinutes = Math.floor(ms / 60_000);
+  const days = Math.floor(totalMinutes / (60 * 24));
+  const hours = Math.floor((totalMinutes - days * 60 * 24) / 60);
+  const minutes = totalMinutes - days * 60 * 24 - hours * 60;
+
+  if (days > 0) {
+    return hours > 0
+      ? t("conversion.success.expiry.remaining.daysHours")
+          .replace("{days}", String(days))
+          .replace("{hours}", String(hours))
+      : t("conversion.success.expiry.remaining.daysOnly").replace(
+          "{days}",
+          String(days),
+        );
+  }
+  if (hours > 0) {
+    return minutes > 0
+      ? t("conversion.success.expiry.remaining.hoursMinutes")
+          .replace("{hours}", String(hours))
+          .replace("{minutes}", String(minutes))
+      : t("conversion.success.expiry.remaining.hoursOnly").replace(
+          "{hours}",
+          String(hours),
+        );
+  }
+  return t("conversion.success.expiry.remaining.minutes").replace(
+    "{minutes}",
+    String(minutes),
+  );
+}
+
+/* -------------------------------------------------------------------------- */
+/* Hook：每分鐘更新「剩餘時間」（過期時切 expired 視覺）                          */
+/* -------------------------------------------------------------------------- */
+
+interface CountdownState {
+  /** 剩餘毫秒；< 0 視為已過期 */
+  remainingMs: number;
+  /** 是否已過期 */
+  expired: boolean;
+}
+
+/**
+ * 計算當下的 countdown — 純函式，不耦合 React state。
+ *
+ * 為了避開 React 19 的 `react-hooks/set-state-in-effect` rule（不允許 effect 內
+ * 同步 setState），我們改成：
+ *   - useState 的 lazy initializer 處理「第一次計算」（不靠 effect 觸發 setState）
+ *   - useEffect 只 setInterval；tick 是非同步事件，setState 在 tick callback 內合法
+ *   - 不監聽 expiresAt 變化重算（succeeded job 的 expires_at 是不可變欄位，
+ *     view lifecycle 期間不會變）
+ */
+function computeCountdown(expiresAt: string | undefined): CountdownState {
+  if (!expiresAt) return { remainingMs: 0, expired: false };
+  const target = Date.parse(expiresAt);
+  if (!Number.isFinite(target)) return { remainingMs: 0, expired: false };
+  const remaining = target - Date.now();
+  return { remainingMs: remaining, expired: remaining <= 0 };
+}
+
+function useExpiryCountdown(expiresAt: string | undefined): CountdownState {
+  // lazy init — 每次 mount 都用最新 Date.now() 算第一筆
+  const [state, setState] = useState<CountdownState>(() =>
+    computeCountdown(expiresAt),
+  );
+
+  useEffect(() => {
+    if (!expiresAt) return;
+    // tick 是 setInterval / setTimeout callback，不是同步 effect 內 setState，符合 react-hooks 規則
+    const tick = () => setState(computeCountdown(expiresAt));
+
+    // 60 秒 tick：用來更新「6 天 23 小時 → 6 天 22 小時」這類分鐘級顯示
+    const intervalId = setInterval(tick, COUNTDOWN_TICK_MS);
+
+    // 額外設一個 setTimeout 在「剛好過期那一刻」開火 — 解掉 60s tick 對「剛剛過期」反應遲鈍
+    // 的問題（以前最多 60 秒空窗 user 可能還能點下載結果 4xx）。
+    let expireTimeoutId: ReturnType<typeof setTimeout> | null = null;
+    const target = Date.parse(expiresAt);
+    if (Number.isFinite(target)) {
+      const remaining = target - Date.now();
+      if (remaining > 0) {
+        // 對齊精確 expiry 時刻 +50ms 緩衝（避免 Date.parse 微小誤差導致 callback 跑時還沒過期）
+        expireTimeoutId = setTimeout(tick, remaining + 50);
+      }
+    }
+
+    return () => {
+      clearInterval(intervalId);
+      if (expireTimeoutId !== null) clearTimeout(expireTimeoutId);
+    };
+  }, [expiresAt]);
+
+  return state;
+}
+
+/* -------------------------------------------------------------------------- */
+/* Component                                                                  */
+/* -------------------------------------------------------------------------- */
+
+export function SuccessView() {
+  const t = useT();
+  const router = useRouter();
+
+  const job = useConversionStore((s) => s.job);
+  const reset = useConversionStore((s) => s.reset);
+
+  const [promoteOpen, setPromoteOpen] = useState(false);
+  /** import 成功後拿到的 model_id（顯示「✓ 已加入」狀態用） */
+  const [importedModelId, setImportedModelId] = useState<string | null>(null);
+
+  const expiry = useExpiryCountdown(job?.expires_at);
+
+  /* ---- 防呆：page.tsx 已 routing；若 job 為 null 直接 return 空（理論上不該發生） ---- */
+  if (!job) {
+    return null;
+  }
+
+  return (
+    <SuccessViewInner
+      job={job}
+      reset={reset}
+      router={router}
+      promoteOpen={promoteOpen}
+      setPromoteOpen={setPromoteOpen}
+      importedModelId={importedModelId}
+      setImportedModelId={setImportedModelId}
+      expiry={expiry}
+      t={t}
+    />
+  );
+}
+
+/* -------------------------------------------------------------------------- */
+/* Inner — 把 hooks 收進來，避免 early-return 後 hook 規則失效                  */
+/* -------------------------------------------------------------------------- */
+
+interface SuccessViewInnerProps {
+  job: ConversionJob;
+  reset: () => void;
+  router: ReturnType<typeof useRouter>;
+  promoteOpen: boolean;
+  setPromoteOpen: (next: boolean) => void;
+  importedModelId: string | null;
+  setImportedModelId: (id: string | null) => void;
+  expiry: CountdownState;
+  t: (key: string) => string;
+}
+
+function SuccessViewInner({
+  job,
+  reset,
+  router,
+  promoteOpen,
+  setPromoteOpen,
+  importedModelId,
+  setImportedModelId,
+  expiry,
+  t,
+}: SuccessViewInnerProps) {
+  /* ---- 衍生資料 ---- */
+  const sourceFilename = job.source_filename || "";
+  const targetChip = job.target_chip;
+  const outputFilename = useMemo(
+    () => buildOutputFilename(sourceFilename, targetChip),
+    [sourceFilename, targetChip],
+  );
+  const outputSize = formatBytes(job.result?.output_size_bytes ?? 0);
+  const checksum = formatChecksum(job.result?.output_checksum);
+  const downloadURL = useMemo(
+    () => getConversionDownloadURL(job.job_id),
+    [job.job_id],
+  );
+
+  const defaultPromoteName = useMemo(
+    () => buildDefaultPromoteName(sourceFilename, targetChip),
+    [sourceFilename, targetChip],
+  );
+
+  /* ---- handlers ---- */
+  const handleImportClick = () => {
+    setPromoteOpen(true);
+  };
+
+  const handlePromoteSuccess = (modelId: string) => {
+    setImportedModelId(modelId);
+    // 對齊 wireframe §7.1：toast「已加入模型庫」+「前往模型庫」連結
+    // 用 Next.js router.push 取代 window.location.href，避免 hard reload 失去 SPA 狀態
+    toast.success(t("conversion.success.import.toastDone"), {
+      description: t("conversion.success.import.statusDone"),
+      action: {
+        label: t("conversion.success.import.toastDoneAction"),
+        onClick: () => {
+          router.push(`/models/${modelId}`);
+        },
+      },
+    });
+  };
+
+  const handleDownloadClick = () => {
+    // 對齊 wireframe §7.1 + flow §5.5：點下載 → toast 提示「下載已開始」+ hint
+    // browser 處理 navigation；按鈕本身是 anchor tag（asChild）— 不需 preventDefault
+    toast.success(t("conversion.success.download.toastStart"), {
+      description: t("conversion.success.download.toastHint"),
+    });
+  };
+
+  const handleStartNew = () => {
+    // store.reset() 切回 idle；polling / upload controller 都會被清掉
+    reset();
+  };
+
+  /* ---- 過期視覺 ---- */
+  // wireframe §7.1 — 過期當下：頁面切「已過期」狀態，按鈕 disabled。
+  // 實作：保留 view 結構但下載 / import 按鈕變 disabled、提示文字換成 expired。
+  const isExpired = expiry.expired;
+
+  return (
+    <div
+      data-testid="conversion-success"
+      data-expired={isExpired ? "true" : "false"}
+      className="space-y-6"
+    >
+      {/* 成功 hero */}
+      <div
+        className="flex items-start gap-3 rounded-xl border border-green-300 bg-green-50/40 p-6 dark:border-green-800 dark:bg-green-950/20"
+        data-testid="success-hero"
+      >
+        <CheckCircle2Icon
+          aria-hidden="true"
+          className="size-6 shrink-0 text-green-600 dark:text-green-400"
+        />
+        <div className="space-y-1">
+          <h2 className="text-lg font-semibold">
+            {t("conversion.success.heading")}
+          </h2>
+          <p className="text-muted-foreground text-sm" data-testid="success-description">
+            {t("conversion.success.description")
+              .replace("{source}", sourceFilename)
+              .replace("{chip}", targetChip)}
+          </p>
+        </div>
+      </div>
+
+      {/* 任務摘要 card */}
+      <div
+        data-testid="success-summary"
+        className="bg-card space-y-3 rounded-xl border p-6"
+      >
+        {/* 檔名 → chip */}
+        <div className="flex flex-wrap items-center gap-x-2 gap-y-1 text-sm">
+          <span className="font-mono" data-testid="success-source-filename">
+            {sourceFilename}
+          </span>
+          <span aria-hidden="true" className="text-muted-foreground">
+            →
+          </span>
+          <span
+            className="bg-accent text-accent-foreground rounded px-2 py-0.5 text-xs font-medium"
+            data-testid="success-target-chip"
+          >
+            {targetChip}
+          </span>
+        </div>
+
+        {/* 輸出檔資訊 */}
+        <dl className="grid gap-3 text-sm sm:grid-cols-2">
+          <div className="space-y-0.5">
+            <dt className="text-muted-foreground text-xs">
+              {t("conversion.success.summary.outputFile")}
+            </dt>
+            <dd
+              data-testid="success-output-filename"
+              className="font-mono text-sm"
+            >
+              {outputFilename}
+            </dd>
+          </div>
+          <div className="space-y-0.5">
+            <dt className="text-muted-foreground text-xs">
+              {t("conversion.success.summary.size")}
+            </dt>
+            <dd data-testid="success-output-size" className="text-sm">
+              {outputSize}
+            </dd>
+          </div>
+          {checksum ? (
+            <div className="space-y-0.5 sm:col-span-2">
+              <dt className="text-muted-foreground text-xs">
+                {t("conversion.success.summary.checksum")}
+              </dt>
+              <dd
+                data-testid="success-output-checksum"
+                className="font-mono text-xs break-all"
+              >
+                {checksum}
+              </dd>
+            </div>
+          ) : null}
+        </dl>
+      </div>
+
+      {/* 兩按鈕區（視覺平衡：grid-cols-1 mobile / grid-cols-2 ≥ sm）*/}
+      <div className="space-y-3" data-testid="success-actions">
+        <p className="text-sm font-medium">{t("conversion.success.nextStep")}</p>
+        <div className="grid grid-cols-1 gap-3 sm:grid-cols-2">
+          {/* 加到模型庫 */}
+          <Button
+            type="button"
+            variant="default"
+            size="lg"
+            onClick={handleImportClick}
+            disabled={isExpired}
+            aria-label={t("conversion.success.import.aria.cta")}
+            data-testid="success-import-button"
+            className="h-auto justify-start gap-3 py-4"
+          >
+            <LibraryIcon aria-hidden="true" className="size-5" />
+            <span className="flex flex-col items-start text-left">
+              <span className="text-base font-semibold">
+                {importedModelId
+                  ? t("conversion.success.import.statusDone")
+                  : t("conversion.success.import.cta")}
+              </span>
+              <span className="text-primary-foreground/80 text-xs font-normal">
+                {t("conversion.success.import.description").replace(
+                  "{chip}",
+                  targetChip,
+                )}
+              </span>
+            </span>
+          </Button>
+
+          {/* 下載 — 過期分支 / 正常分支拆開：
+              - 過期：渲染 <Button disabled>（真實 button 元素 + native disabled 語意，
+                kbd 不會 focus、SR 拿到 disabled、避免 race（mousedown→mouseup 之間切過期）
+                時 user 點了沒反應且不知為什麼的問題）
+              - 未過期：渲染 <Button asChild><a download>，沿用既有 browser navigation
+                方案（飛 token 不過 frontend JS） */}
+          {isExpired ? (
+            <Button
+              type="button"
+              variant="outline"
+              size="lg"
+              disabled
+              aria-label={t("conversion.success.download.aria.disabled")}
+              data-testid="success-download-button"
+              className="h-auto justify-start gap-3 py-4"
+            >
+              <DownloadIcon aria-hidden="true" className="size-5" />
+              <span className="flex flex-col items-start text-left">
+                <span className="text-base font-semibold">
+                  {t("conversion.success.download.cta")}
+                </span>
+                <span className="text-xs font-normal opacity-70">
+                  {t("conversion.success.download.description")}
+                </span>
+              </span>
+            </Button>
+          ) : (
+            <Button
+              asChild
+              variant="outline"
+              size="lg"
+              aria-label={t("conversion.success.download.aria.cta")}
+              data-testid="success-download-button"
+              className="h-auto justify-start gap-3 py-4"
+            >
+              <a
+                href={downloadURL}
+                download
+                onClick={handleDownloadClick}
+              >
+                <DownloadIcon aria-hidden="true" className="size-5" />
+                <span className="flex flex-col items-start text-left">
+                  <span className="text-base font-semibold">
+                    {t("conversion.success.download.cta")}
+                  </span>
+                  <span className="text-muted-foreground text-xs font-normal">
+                    {t("conversion.success.download.description")}
+                  </span>
+                </span>
+              </a>
+            </Button>
+          )}
+        </div>
+      </div>
+
+      {/* 7 天倒數提醒 */}
+      <p
+        data-testid="success-expiry-hint"
+        role="status"
+        aria-live="polite"
+        className="flex items-start gap-2 text-xs text-amber-700 dark:text-amber-400"
+      >
+        <span aria-hidden="true">⏳</span>
+        <span>
+          {isExpired
+            ? t("conversion.success.expiry.expired")
+            : t("conversion.success.expiry").replace(
+                "{time}",
+                formatRemainingTime(expiry.remainingMs, t),
+              )}
+        </span>
+      </p>
+
+      {/* 「開始新轉檔」（在結果卡片外面 — wireframe §7.3 設計：避免誤點離開結果頁）*/}
+      <div className="flex justify-end border-t pt-4">
+        <Button
+          type="button"
+          variant="ghost"
+          onClick={handleStartNew}
+          data-testid="success-start-new"
+        >
+          {t("conversion.success.startNew")}
+        </Button>
+      </div>
+
+      {/* PromoteDialog */}
+      <PromoteDialog
+        open={promoteOpen}
+        onOpenChange={setPromoteOpen}
+        defaultName={defaultPromoteName}
+        targetChip={targetChip}
+        jobId={job.job_id}
+        onSuccess={handlePromoteSuccess}
+      />
+    </div>
+  );
+}
diff --git a/visionA-frontend/src/app/conversion/components/UploadingView.test.tsx b/visionA-frontend/src/app/conversion/components/UploadingView.test.tsx
new file mode 100644
index 0000000..0c9fea2
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/UploadingView.test.tsx
@@ -0,0 +1,263 @@
+/**
+ * UploadingView 單元測試（Phase 0.8 F-T5）
+ *
+ * 對齊：
+ *   - wireframe-conversion.md §3.2（Uploading state 視覺）
+ *   - flow-conversion.md §5.2（uploading state 邊界）
+ *
+ * 覆蓋：
+ *   - 進度 0% / 50% / 100% → progress bar + 文字反映
+ *   - ETA 計算：前期顯示「預估剩餘時間…」、有資料後顯示「X 秒」、< 5 秒顯示「即將完成」
+ *   - 取消按鈕 → 開 AlertDialog；確認 → 呼叫 store.cancelUpload；取消 dialog 不呼叫
+ *   - mount → addEventListener('beforeunload')；unmount → removeEventListener
+ *   - 顯示來源檔名 + target chip（job 已存在時）
+ *
+ * 不負責：
+ *   - store 內部 cancelUpload 行為（store 自己有測試）
+ *   - i18n key 完整性（i18n.test.ts 已測）
+ */
+
+import { fireEvent, render, screen } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { LocaleProvider } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+import type { ConversionJob } from "@/types/conversion";
+
+import { UploadingView } from "./UploadingView";
+
+/* -------------------------------------------------------------------------- */
+/* Helpers                                                                    */
+/* -------------------------------------------------------------------------- */
+
+function renderView() {
+  return render(
+    <LocaleProvider>
+      <UploadingView />
+    </LocaleProvider>,
+  );
+}
+
+function setProgress(loaded: number, total: number) {
+  useConversionStore.setState({
+    uiState: "uploading",
+    uploadProgress: { loaded, total },
+  });
+}
+
+/** 5 MB / 10 MB / 100 MB 對應的位元組 */
+const MB = 1024 * 1024;
+
+/* -------------------------------------------------------------------------- */
+/* Lifecycle                                                                  */
+/* -------------------------------------------------------------------------- */
+
+beforeEach(() => {
+  useConversionStore.getState().reset();
+  // 預設進入 uploading state（沒有 progress 也能渲）
+  useConversionStore.setState({ uiState: "uploading" });
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  useConversionStore.getState().reset();
+});
+
+/* -------------------------------------------------------------------------- */
+/* Tests                                                                      */
+/* -------------------------------------------------------------------------- */
+
+describe("<UploadingView /> — 進度顯示", () => {
+  it("初始 0% → progress bar value=0、顯示 0%", () => {
+    setProgress(0, 5 * MB);
+    renderView();
+
+    const progressEl = screen.getByTestId("uploading-progress");
+    // Radix Progress 的 progressbar role 由元件內部 indicator 提供；驗 aria-valuenow 即可
+    expect(progressEl.getAttribute("aria-valuenow")).toBe("0");
+
+    const text = screen.getByTestId("uploading-progress-text").textContent ?? "";
+    expect(text).toContain("0%");
+  });
+
+  it("50% → progress aria-valuenow=50、文字顯示 50%", () => {
+    setProgress(2.5 * MB, 5 * MB);
+    renderView();
+
+    expect(
+      screen.getByTestId("uploading-progress").getAttribute("aria-valuenow"),
+    ).toBe("50");
+    expect(
+      screen.getByTestId("uploading-progress-text").textContent,
+    ).toContain("50%");
+  });
+
+  it("100% → aria-valuenow=100、進度文字顯示 100%", () => {
+    setProgress(5 * MB, 5 * MB);
+    renderView();
+
+    expect(
+      screen.getByTestId("uploading-progress").getAttribute("aria-valuenow"),
+    ).toBe("100");
+    expect(
+      screen.getByTestId("uploading-progress-text").textContent,
+    ).toContain("100%");
+  });
+
+  it("total=0 防呆：不會 NaN，progress=0", () => {
+    setProgress(0, 0);
+    renderView();
+    expect(
+      screen.getByTestId("uploading-progress").getAttribute("aria-valuenow"),
+    ).toBe("0");
+  });
+});
+
+describe("<UploadingView /> — ETA", () => {
+  it("初始（無速度資料）→ 顯示「預估剩餘時間…」", () => {
+    setProgress(0, 5 * MB);
+    renderView();
+    const etaText = screen.getByTestId("uploading-eta-text").textContent ?? "";
+    // i18n: 「預估剩餘時間…」/ Estimating time remaining…
+    expect(
+      etaText.includes("預估剩餘時間") || etaText.includes("Estimating"),
+    ).toBe(true);
+  });
+
+  it("接近完成（pct >= 99.5%）→ 顯示「即將完成」", () => {
+    setProgress(4.99 * MB, 5 * MB);
+    renderView();
+    const etaText = screen.getByTestId("uploading-eta-text").textContent ?? "";
+    expect(etaText.includes("即將完成") || etaText.includes("Almost")).toBe(
+      true,
+    );
+  });
+});
+
+describe("<UploadingView /> — 取消流程", () => {
+  it("點取消按鈕 → 開啟 AlertDialog（顯示確認文字）", () => {
+    setProgress(MB, 5 * MB);
+    renderView();
+
+    fireEvent.click(screen.getByTestId("uploading-cancel"));
+    // AlertDialog 是 Radix portal — confirm 內容應該出現
+    expect(screen.getByTestId("uploading-cancel-confirm")).toBeTruthy();
+    expect(screen.getByTestId("uploading-cancel-confirm-yes")).toBeTruthy();
+    expect(screen.getByTestId("uploading-cancel-confirm-no")).toBeTruthy();
+  });
+
+  it("確認取消 → 呼叫 store.cancelUpload", () => {
+    const cancelUpload = vi.fn();
+    useConversionStore.setState({ cancelUpload });
+    setProgress(MB, 5 * MB);
+    renderView();
+
+    fireEvent.click(screen.getByTestId("uploading-cancel"));
+    fireEvent.click(screen.getByTestId("uploading-cancel-confirm-yes"));
+    expect(cancelUpload).toHaveBeenCalledTimes(1);
+  });
+
+  it("選「繼續上傳」→ 不呼叫 cancelUpload", () => {
+    const cancelUpload = vi.fn();
+    useConversionStore.setState({ cancelUpload });
+    setProgress(MB, 5 * MB);
+    renderView();
+
+    fireEvent.click(screen.getByTestId("uploading-cancel"));
+    fireEvent.click(screen.getByTestId("uploading-cancel-confirm-no"));
+    expect(cancelUpload).not.toHaveBeenCalled();
+  });
+});
+
+describe("<UploadingView /> — beforeunload listener", () => {
+  it("mount → addEventListener('beforeunload')；unmount → removeEventListener", () => {
+    const addSpy = vi.spyOn(window, "addEventListener");
+    const removeSpy = vi.spyOn(window, "removeEventListener");
+
+    setProgress(0, 5 * MB);
+    const { unmount } = renderView();
+
+    // 找到 beforeunload listener
+    const addCall = addSpy.mock.calls.find((c) => c[0] === "beforeunload");
+    expect(addCall, "should add beforeunload listener on mount").toBeTruthy();
+
+    unmount();
+
+    const removeCall = removeSpy.mock.calls.find((c) => c[0] === "beforeunload");
+    expect(
+      removeCall,
+      "should remove beforeunload listener on unmount",
+    ).toBeTruthy();
+    // 確認移除的是同一個 handler reference（add[1] === remove[1]）
+    expect(removeCall?.[1]).toBe(addCall?.[1]);
+  });
+
+  it("beforeunload handler 設定 returnValue=''（觸發瀏覽器 generic 警告）", () => {
+    const handlers: EventListenerOrEventListenerObject[] = [];
+    const origAdd = window.addEventListener.bind(window);
+    vi.spyOn(window, "addEventListener").mockImplementation(
+      (type: string, handler, options) => {
+        if (type === "beforeunload" && handler) {
+          handlers.push(handler);
+        }
+        return origAdd(type, handler, options);
+      },
+    );
+
+    setProgress(0, 5 * MB);
+    renderView();
+
+    const handler = handlers[0];
+    expect(handler).toBeTruthy();
+
+    // 模擬 beforeunload：preventDefault + returnValue = ""
+    const event = new Event("beforeunload", { cancelable: true }) as BeforeUnloadEvent;
+    // BeforeUnloadEvent 在 happy-dom 是普通 Event；補 returnValue 屬性以驗證設值
+    Object.defineProperty(event, "returnValue", {
+      value: "",
+      writable: true,
+      configurable: true,
+    });
+    if (typeof handler === "function") {
+      handler(event);
+    } else {
+      handler.handleEvent(event);
+    }
+    // returnValue 已被 handler 寫成 ""
+    expect(event.returnValue).toBe("");
+    expect(event.defaultPrevented).toBe(true);
+  });
+});
+
+describe("<UploadingView /> — 來源檔名 / chip 顯示", () => {
+  it("job 帶 source_filename + target_chip → 都顯示", () => {
+    const job: ConversionJob = {
+      job_id: "abc-123",
+      status: "queued",
+      source_filename: "yolov5s.onnx",
+      target_chip: "KL720",
+      created_at: new Date().toISOString(),
+      expires_at: new Date(Date.now() + 7 * 86400_000).toISOString(),
+    };
+    useConversionStore.setState({
+      uiState: "uploading",
+      uploadProgress: { loaded: 0, total: 5 * MB },
+      job,
+    });
+    renderView();
+
+    expect(
+      screen.getByTestId("uploading-source-filename").textContent,
+    ).toContain("yolov5s.onnx");
+    const chipText =
+      screen.getByTestId("uploading-target-chip").textContent ?? "";
+    expect(chipText).toContain("KL720");
+  });
+
+  it("沒有 job → 不渲染檔名/chip 區塊（避免空 chip）", () => {
+    setProgress(0, 5 * MB);
+    renderView();
+    expect(screen.queryByTestId("uploading-source-filename")).toBeNull();
+    expect(screen.queryByTestId("uploading-target-chip")).toBeNull();
+  });
+});
diff --git a/visionA-frontend/src/app/conversion/components/UploadingView.tsx b/visionA-frontend/src/app/conversion/components/UploadingView.tsx
new file mode 100644
index 0000000..00f41ad
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/components/UploadingView.tsx
@@ -0,0 +1,402 @@
+"use client";
+
+/**
+ * UploadingView — Uploading state（XHR 進度條 + ETA + 取消 + beforeunload）
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §3.2 + §4.2)
+ *
+ * 對齊：
+ *   - flow-conversion.md §5.2（uploading state 邊界 — 切走頁面 / 失敗 / 取消）
+ *   - architecture/conversion.md §4.3.1（streaming proxy 進度語意：
+ *       XHR onprogress 是 browser→backend 的進度，不是端到端轉檔進度）
+ *
+ * 職責：
+ *   - 顯示來源檔名 + target chip
+ *   - Progress bar（store.uploadProgress 驅動，0–100%）
+ *   - 「{loaded MB} / {total MB} · 預估剩餘 {eta}」即時文字
+ *   - 「取消」按鈕 → AlertDialog 確認 → 呼叫 store.cancelUpload()
+ *   - 進入此 view 時掛 `beforeunload` listener，離開（state 切走 / unmount）自動移除
+ *
+ * 不做：
+ *   - 不直接打 API：所有進度資料、cancel 動作走 conversion-store（單一 source of truth）
+ *   - 不顯示 toast：toast 行為由 store / page 層統一處理（避免重複觸發）
+ *
+ * UX 細節：
+ *   - ETA 用 EWMA（指數加權移動平均，alpha=0.3）平滑速度，避免第一秒抖動
+ *   - eta < 5 秒 → 直接顯示「即將完成」（避免「3 秒 → 5 秒 → 2 秒」抖動）
+ *   - upload 一開始（loaded=0）顯示「預估剩餘時間…」
+ *
+ * a11y（review M2 修補）：
+ *   - 視覺進度文字**不**包 aria-live（每 50–250ms 更新一次，會讓 SR 過度朗讀）
+ *   - progressbar 元件自帶 aria-valuenow → SR 會在數值變動時自動 announce
+ *   - 額外加一個獨立 sr-only `aria-live="polite"` 區塊，**節流到每 5 秒最多朗讀一次**，
+ *     用 `aria-atomic="true"` 確保朗讀整段不是 diff
+ */
+
+import { XIcon } from "lucide-react";
+import { useEffect, useId, useMemo, useRef, useState } from "react";
+
+import {
+  AlertDialog,
+  AlertDialogAction,
+  AlertDialogCancel,
+  AlertDialogContent,
+  AlertDialogDescription,
+  AlertDialogFooter,
+  AlertDialogHeader,
+  AlertDialogTitle,
+} from "@/components/ui/alert-dialog";
+import { Button } from "@/components/ui/button";
+import { Progress } from "@/components/ui/progress";
+import { useT } from "@/lib/i18n/context";
+import {
+  ALMOST_DONE_THRESHOLD_SEC,
+  computeEtaUpdate,
+  type ProgressSample,
+} from "@/lib/utils/eta";
+import { useConversionStore } from "@/stores/conversion-store";
+
+/** sr-only 節流：5 秒內最多朗讀一次，避免每秒打斷 SR */
+const SR_ANNOUNCE_INTERVAL_MS = 5000;
+
+/* -------------------------------------------------------------------------- */
+/* 工具：bytes → 人類可讀（B / KB / MB / GB）                                   */
+/* -------------------------------------------------------------------------- */
+function formatBytes(bytes: number): string {
+  if (!Number.isFinite(bytes) || bytes < 0) return "0 B";
+  if (bytes < 1024) return `${bytes} B`;
+  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`;
+  if (bytes < 1024 * 1024 * 1024) {
+    return `${(bytes / (1024 * 1024)).toFixed(1)} MB`;
+  }
+  return `${(bytes / (1024 * 1024 * 1024)).toFixed(2)} GB`;
+}
+
+/* -------------------------------------------------------------------------- */
+/* 工具：秒數 → 「X 分 Y 秒」/「Y 秒」                                          */
+/* -------------------------------------------------------------------------- */
+function formatEtaSeconds(secondsRaw: number): string {
+  const seconds = Math.max(0, Math.round(secondsRaw));
+  if (seconds < 60) return `${seconds} 秒 / sec`;
+  const m = Math.floor(seconds / 60);
+  const s = seconds % 60;
+  return s === 0 ? `${m} 分 / min` : `${m} 分 ${s} 秒 / min`;
+}
+
+/* -------------------------------------------------------------------------- */
+/* hook：根據 uploadProgress 計算 ETA（EWMA）                                  */
+/* -------------------------------------------------------------------------- */
+interface EtaState {
+  /** 平滑後速度，bytes/sec；null 代表還沒有足夠資料 */
+  smoothedSpeed: number | null;
+  /** ETA 秒數；null 代表算不出來（loaded=0 / total=0 / speed=0） */
+  etaSeconds: number | null;
+}
+
+/**
+ * 根據 progress 變化算出 ETA。
+ *
+ * 演算法（EWMA / 邊界）抽到 `@/lib/utils/eta` 的純函式 `computeEtaUpdate`，
+ * 此 hook 只負責：
+ *   - 用 ref 保存上一次 sample（不觸發 re-render）
+ *   - 把純函式回傳的 next state 寫進 React state
+ *
+ * 詳細邊界（第一次 / dt<100ms / 倒退 / 正常）見 `eta.ts` 與 `eta.test.ts`。
+ */
+function useEta(loaded: number, total: number): EtaState {
+  const lastSampleRef = useRef<ProgressSample | null>(null);
+  const [state, setState] = useState<EtaState>({
+    smoothedSpeed: null,
+    etaSeconds: null,
+  });
+
+  useEffect(() => {
+    if (total <= 0 || loaded < 0) {
+      // 防呆
+      return;
+    }
+
+    const now =
+      typeof performance !== "undefined" ? performance.now() : Date.now();
+    const prev = lastSampleRef.current;
+
+    setState((curr) => {
+      const result = computeEtaUpdate(prev, curr.smoothedSpeed, now, loaded, total);
+
+      // 更新 ref（caller 端的責任）— reset / 第一次都要記下這次 sample
+      if (result.resetSample || prev === null || result.updated) {
+        lastSampleRef.current = { at: now, loaded };
+      }
+
+      if (result.resetSample) {
+        return { smoothedSpeed: null, etaSeconds: null };
+      }
+      if (!result.updated) {
+        return curr;
+      }
+      return {
+        smoothedSpeed: result.smoothedSpeed,
+        etaSeconds: result.etaSeconds,
+      };
+    });
+  }, [loaded, total]);
+
+  return state;
+}
+
+/* -------------------------------------------------------------------------- */
+/* hook：beforeunload 警告（只在掛載期間有效）                                  */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * 進入 uploading 時掛 `beforeunload` listener，unmount（離開頁面 / state 切走）
+ * 自動移除。Chrome 不會顯示自訂訊息，只會顯示 generic 警告 — `returnValue = ""` 即可觸發。
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/flows/flow-conversion.md §5.2 邊界 — 切走頁面)
+ */
+function useBeforeUnloadWarning(enabled: boolean): void {
+  useEffect(() => {
+    if (!enabled) return;
+    if (typeof window === "undefined") return;
+
+    const handler = (e: BeforeUnloadEvent) => {
+      // 標準寫法：preventDefault + returnValue = ""
+      // Chrome / Edge / Safari 顯示 generic 警告；Firefox 也接受
+      e.preventDefault();
+      e.returnValue = "";
+    };
+
+    window.addEventListener("beforeunload", handler);
+    return () => {
+      window.removeEventListener("beforeunload", handler);
+    };
+  }, [enabled]);
+}
+
+/* -------------------------------------------------------------------------- */
+/* Component                                                                  */
+/* -------------------------------------------------------------------------- */
+
+export function UploadingView() {
+  const t = useT();
+
+  // store state（用 selector 各別訂閱避免無謂 re-render）
+  const uploadProgress = useConversionStore((s) => s.uploadProgress);
+  const job = useConversionStore((s) => s.job);
+  const cancelUpload = useConversionStore((s) => s.cancelUpload);
+
+  // 取消確認 dialog
+  const [confirmOpen, setConfirmOpen] = useState(false);
+
+  // mount 期間掛 beforeunload；離開 uploading state（page.tsx 會 unmount 此元件）
+  // 自動移除。這樣不需要額外監聽 store.uiState — React lifecycle 已保證。
+  useBeforeUnloadWarning(true);
+
+  // sr-only 節流朗讀（review M2）：每 5 秒最多更新一次
+  const [accessibleStatus, setAccessibleStatus] = useState("");
+  const lastAnnouncedAtRef = useRef<number>(0);
+
+  /* ---- 衍生資料 ---- */
+  const loaded = uploadProgress?.loaded ?? 0;
+  // total 為 0 時可能是 store 還沒寫入；保守用 1 避免 progress = NaN（顯示時用實際 total 判斷）
+  const total = uploadProgress?.total ?? 0;
+  const pct = useMemo(() => {
+    if (total <= 0) return 0;
+    return Math.min(100, Math.max(0, (loaded / total) * 100));
+  }, [loaded, total]);
+
+  // ETA
+  const { etaSeconds } = useEta(loaded, total);
+
+  /* ---- 顯示文字 ---- */
+  // 進度文字：「11.9 MB / 28.4 MB」
+  const progressText = useMemo(
+    () =>
+      t("conversion.uploading.progress.format")
+        .replace("{loaded}", formatBytes(loaded))
+        .replace("{total}", formatBytes(total)),
+    [t, loaded, total],
+  );
+
+  // ETA 文字：三種狀態
+  //   1. pct >= 99.5%（最後一段，已不需要 ETA） → 「即將完成」
+  //   2. 還沒有速度資料 → 「預估剩餘時間…」
+  //   3. < 5 秒 → 「即將完成」（避免最後幾秒抖動）
+  //   4. 其他 → 「預估剩餘 X 分 Y 秒」
+  const etaText = useMemo(() => {
+    // 優先判斷接近完成（即使 etaSeconds 還沒算出來）
+    if (pct >= 99.5) return t("conversion.uploading.eta.almostDone");
+    if (etaSeconds === null) return t("conversion.uploading.eta.computing");
+    if (etaSeconds < ALMOST_DONE_THRESHOLD_SEC) {
+      return t("conversion.uploading.eta.almostDone");
+    }
+    return t("conversion.uploading.eta.format").replace(
+      "{eta}",
+      formatEtaSeconds(etaSeconds),
+    );
+  }, [t, etaSeconds, pct]);
+
+  // 來源檔名（uploading state 沒有 job.source_filename — 那是 backend 啟動後才知道；
+  // 上傳中 job 通常是 null，因此 fallback 用 i18n 通用標題）
+  const sourceFilename = job?.source_filename ?? "";
+  const targetChip = job?.target_chip;
+
+  /* ---- sr-only 節流朗讀 ---- */
+  // pct / etaText 每 50–250ms 變一次；SR 朗讀區每 5 秒最多更新一次。
+  // 起點（lastAnnouncedAtRef.current === 0）也算一次更新，確保第一次有 announce。
+  useEffect(() => {
+    const now = Date.now();
+    if (now - lastAnnouncedAtRef.current >= SR_ANNOUNCE_INTERVAL_MS) {
+      setAccessibleStatus(
+        t("conversion.uploading.aria.status")
+          .replace("{pct}", String(Math.round(pct)))
+          .replace("{eta}", etaText),
+      );
+      lastAnnouncedAtRef.current = now;
+    }
+  }, [t, pct, etaText]);
+
+  /* ---- a11y ids ---- */
+  const headingId = useId();
+  const progressLabelId = useId();
+
+  /* ---- handlers ---- */
+  const handleCancelClick = () => setConfirmOpen(true);
+  const handleConfirmCancel = () => {
+    setConfirmOpen(false);
+    cancelUpload();
+  };
+
+  return (
+    <div
+      data-testid="conversion-uploading"
+      className="bg-card space-y-4 rounded-xl border p-6"
+    >
+      {/* 標題區 */}
+      <div className="space-y-1">
+        <h2 id={headingId} className="text-lg font-semibold">
+          {t("conversion.uploading.heading")}
+        </h2>
+        <p className="text-muted-foreground text-sm">
+          {t("conversion.uploading.subtitle")}
+        </p>
+      </div>
+
+      {/* 檔名 + chip */}
+      {(sourceFilename || targetChip) && (
+        <div className="flex flex-wrap items-center gap-x-3 gap-y-1 text-sm">
+          {sourceFilename ? (
+            <span
+              className="font-mono"
+              data-testid="uploading-source-filename"
+            >
+              {sourceFilename}
+            </span>
+          ) : null}
+          {targetChip ? (
+            <span
+              className="bg-accent text-accent-foreground rounded px-2 py-0.5 text-xs font-medium"
+              data-testid="uploading-target-chip"
+            >
+              {t("conversion.uploading.target").replace(
+                "{chip}",
+                targetChip,
+              )}
+            </span>
+          ) : null}
+        </div>
+      )}
+
+      {/* Progress bar */}
+      <div className="space-y-2">
+        <span id={progressLabelId} className="sr-only">
+          {t("conversion.uploading.aria.progress")}
+        </span>
+        <Progress
+          value={pct}
+          aria-labelledby={progressLabelId}
+          aria-valuemin={0}
+          aria-valuemax={100}
+          aria-valuenow={Math.round(pct)}
+          data-testid="uploading-progress"
+        />
+        {/*
+          視覺進度文字 — **不要** aria-live：每 50–250ms 變動一次會打斷 SR。
+          progressbar 的 aria-valuenow 已自帶 a11y，下面 sr-only 區塊負責節流朗讀。
+        */}
+        <div className="text-muted-foreground flex flex-wrap items-center justify-between gap-2 text-sm">
+          <span data-testid="uploading-progress-text">
+            {progressText}
+            <span className="mx-2">·</span>
+            {`${Math.round(pct)}%`}
+          </span>
+          <span data-testid="uploading-eta-text">{etaText}</span>
+        </div>
+
+        {/*
+          sr-only 朗讀區（review M2）：每 5 秒最多朗讀一次；aria-atomic="true"
+          確保 SR 朗讀整段而不是 diff。視覺使用者看不到。
+        */}
+        <div
+          className="sr-only"
+          aria-live="polite"
+          aria-atomic="true"
+          role="status"
+          data-testid="uploading-sr-status"
+        >
+          {accessibleStatus}
+        </div>
+      </div>
+
+      {/* 取消按鈕 */}
+      <div className="flex justify-end">
+        <Button
+          type="button"
+          variant="outline"
+          onClick={handleCancelClick}
+          aria-label={t("conversion.uploading.aria.cancel")}
+          data-testid="uploading-cancel"
+        >
+          <XIcon aria-hidden="true" className="size-4" />
+          {t("conversion.uploading.cancel")}
+        </Button>
+      </div>
+
+      {/* 提示：上傳完後會接 processing */}
+      <p className="text-muted-foreground border-t pt-3 text-xs">
+        {t("conversion.uploading.info")}
+      </p>
+
+      {/* 警告：beforeunload 同時有 inline 警示，加強可見性 */}
+      <p className="text-amber-700 dark:text-amber-400 text-xs">
+        {t("conversion.uploading.warning")}
+      </p>
+
+      {/* 取消確認 dialog */}
+      <AlertDialog open={confirmOpen} onOpenChange={setConfirmOpen}>
+        <AlertDialogContent data-testid="uploading-cancel-confirm">
+          <AlertDialogHeader>
+            <AlertDialogTitle>
+              {t("conversion.uploading.cancel.confirm.title")}
+            </AlertDialogTitle>
+            <AlertDialogDescription>
+              {t("conversion.uploading.cancel.confirm.message")}
+            </AlertDialogDescription>
+          </AlertDialogHeader>
+          <AlertDialogFooter>
+            <AlertDialogCancel data-testid="uploading-cancel-confirm-no">
+              {t("conversion.uploading.cancel.confirm.no")}
+            </AlertDialogCancel>
+            <AlertDialogAction
+              variant="destructive"
+              onClick={handleConfirmCancel}
+              data-testid="uploading-cancel-confirm-yes"
+            >
+              {t("conversion.uploading.cancel.confirm.yes")}
+            </AlertDialogAction>
+          </AlertDialogFooter>
+        </AlertDialogContent>
+      </AlertDialog>
+    </div>
+  );
+}
diff --git a/visionA-frontend/src/app/conversion/e2e-conversion-flow.test.tsx b/visionA-frontend/src/app/conversion/e2e-conversion-flow.test.tsx
new file mode 100644
index 0000000..a6e28b1
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/e2e-conversion-flow.test.tsx
@@ -0,0 +1,615 @@
+/**
+ * E2E flow 整合測試（Phase 0.8 — F-T10）
+ *
+ * 對齊：
+ *   - PRD：`.autoflow/02-prd/features/feature-converter-integration.md` §9 驗收條件
+ *   - Flow：`.autoflow/03-design/flows/flow-conversion.md` state machine + §6 邊界
+ *   - Wireframe：`.autoflow/03-design/wireframes/wireframe-conversion.md`
+ *
+ * 範圍：
+ *   這次 **不是** unit test 也不是 component test，而是「跨元件 + 跨 store + 跨 API client mock 的
+ *   flow test」。從 `<ConversionPage />` 入口出發，走完 idle → uploading → queued → running →
+ *   succeeded → 加到模型庫 / 下載 / 開始新轉檔 等鏈路。
+ *
+ * 與既有 unit test 的差異：
+ *   - `IdleForm.test.tsx`：spy `store.startConversion`，不真的進 store 內部
+ *   - `conversion-store.test.ts`：mock API client，不真的 render UI
+ *   - `page.test.tsx`：直接設 `useConversionStore.setState({ uiState })`，跳過 view transition
+ *   - **本檔**：mock 最底層的 `@/lib/api/conversion`，讓 store 真的跑 + 讓 view 真的 transit；
+ *     驗 user 從點檔案、到看到 SuccessView 的整條鏈。
+ *
+ * Mock 策略：
+ *   - `@/lib/api/conversion` 的 5 個函式 → vi.mock（保留 ConversionAPIError class）
+ *   - `next/navigation` 的 `useRouter` → 簡 stub（SuccessView / FailedView 用到）
+ *   - `sonner` 的 `toast` → vi.mock，攔截 success/error 呼叫
+ *   - `vi.useFakeTimers()` 推進 polling（5s / 10s tick）
+ *   - `vi.spyOn(Date, "now")` 鎖時間，讓 SuccessView 的 countdown 不影響其他斷言
+ *
+ * 為什麼不 mock XHR 直接：
+ *   `initConversion` 既有 unit test 已覆蓋 XHR 細節（progress event、signal、abort）。
+ *   本檔 e2e 在 store 邊界 mock，焦點放在「flow 串通」而非「XHR 行為」。`onUploadProgress`
+ *   callback 改由 mock initConversion 主動呼叫模擬，效果等價但更穩定。
+ *
+ * 涵蓋（PRD §9 驗收條件）：
+ *   ✅ .onnx + KL720 + 0 ref images → e2e 成功（test 1）
+ *   ✅ .onnx + KL720 + 5 ref images → e2e 成功（test 2）
+ *   ✅ 上傳失敗 → idle + form 保留 → 重試（test 3）
+ *   ✅ polling 5xx → 指數退避 → 恢復繼續（test 4）
+ *   ✅ expired job 從 bootstrap 進入 → ExpiredView → reset 回 idle（test 5）
+ *
+ * 不重測的：
+ *   - 前端驗證錯誤（IdleForm.test 已蓋）
+ *   - PromoteDialog 內部驗證 / spinner / router push（SuccessView.test 已蓋）
+ *   - Failed view 細節 / 過期視覺（FailedView.test / SuccessView.test 已蓋）
+ */
+
+import { fireEvent, render, screen, waitFor, within } from "@testing-library/react";
+import {
+  afterEach,
+  beforeEach,
+  describe,
+  expect,
+  it,
+  vi,
+  type Mock,
+} from "vitest";
+
+import { ConversionAPIError } from "@/lib/api/conversion";
+import * as conversionApi from "@/lib/api/conversion";
+import { LocaleProvider } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+import type {
+  ConversionJob,
+  InitConversionArgs,
+  TargetChip,
+} from "@/types/conversion";
+
+/* -------------------------------------------------------------------------- */
+/* Mock @/lib/api/conversion — store 行為由 store 自己跑，但底層 5 個 fn 用 mock */
+/* -------------------------------------------------------------------------- */
+
+vi.mock("@/lib/api/conversion", async () => {
+  const actual = await vi.importActual<typeof import("@/lib/api/conversion")>(
+    "@/lib/api/conversion",
+  );
+  return {
+    ...actual,
+    getActiveConversion: vi.fn(),
+    initConversion: vi.fn(),
+    getConversion: vi.fn(),
+    promoteConversionToModels: vi.fn(),
+    getConversionDownloadURL: actual.getConversionDownloadURL,
+  };
+});
+
+const mockedApi = conversionApi as unknown as {
+  getActiveConversion: Mock;
+  initConversion: Mock;
+  getConversion: Mock;
+  promoteConversionToModels: Mock;
+};
+
+/* -------------------------------------------------------------------------- */
+/* Mock next/navigation — SuccessView / FailedView 內用 useRouter             */
+/* -------------------------------------------------------------------------- */
+
+const mockRouterPush = vi.fn();
+
+vi.mock("next/navigation", () => ({
+  useRouter: () => ({
+    push: mockRouterPush,
+    replace: vi.fn(),
+    back: vi.fn(),
+    forward: vi.fn(),
+    refresh: vi.fn(),
+    prefetch: vi.fn(),
+  }),
+}));
+
+/* -------------------------------------------------------------------------- */
+/* Mock sonner toast — 攔截 success / error 呼叫                                */
+/* -------------------------------------------------------------------------- */
+
+vi.mock("sonner", () => {
+  const success = vi.fn();
+  const error = vi.fn();
+  return {
+    toast: Object.assign(vi.fn(), {
+      success,
+      error,
+      warning: vi.fn(),
+      info: vi.fn(),
+      message: vi.fn(),
+    }),
+    Toaster: () => null,
+  };
+});
+
+import { toast } from "sonner";
+import ConversionPage from "./page";
+
+/* -------------------------------------------------------------------------- */
+/* Helpers                                                                    */
+/* -------------------------------------------------------------------------- */
+
+/** 建立指定 size / name 的 File（避免真的吃 RAM） */
+function makeFile(name: string, sizeBytes: number, type = "application/octet-stream"): File {
+  const file = new File([new Uint8Array(1)], name, { type });
+  Object.defineProperty(file, "size", { value: sizeBytes, configurable: true });
+  return file;
+}
+
+function makeImage(name: string, sizeBytes: number): File {
+  return makeFile(name, sizeBytes, "image/png");
+}
+
+/** 把 file 塞進 input[type=file]（DataTransfer mock） */
+function setInputFiles(input: HTMLInputElement, files: File[]) {
+  Object.defineProperty(input, "files", {
+    value: files,
+    configurable: true,
+  });
+  fireEvent.change(input);
+}
+
+/** 取「來源模型」的 file input */
+function getModelInput(): HTMLInputElement {
+  const dropzone = screen.getByTestId("model-dropzone");
+  const input = dropzone.querySelector("input[type='file']:not([multiple])");
+  if (!input) throw new Error("model file input not found");
+  return input as HTMLInputElement;
+}
+
+/** 取 ref images 的 file input（multiple） */
+function getRefImagesInput(): HTMLInputElement {
+  const dropzone = screen.getByTestId("ref-images-dropzone");
+  const input = dropzone.querySelector("input[type='file'][multiple]");
+  if (!input) throw new Error("ref images file input not found");
+  return input as HTMLInputElement;
+}
+
+/** 模板 ConversionJob — 每個測試用 spread 蓋自己想要的欄位 */
+function makeJob(overrides: Partial<ConversionJob> = {}): ConversionJob {
+  return {
+    job_id: "job-e2e-1",
+    status: "queued",
+    source_filename: "yolov5s.onnx",
+    target_chip: "KL720",
+    created_at: "2026-04-30T12:00:00Z",
+    // 7 天後（給 SuccessView countdown 顯示「剩 7 天」）
+    expires_at: "2026-05-07T12:00:00Z",
+    ...overrides,
+  };
+}
+
+/** 把整個 ConversionPage render 起來（含 LocaleProvider） */
+function renderApp() {
+  return render(
+    <LocaleProvider>
+      <ConversionPage />
+    </LocaleProvider>,
+  );
+}
+
+/* -------------------------------------------------------------------------- */
+/* Lifecycle                                                                  */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * 鎖 Date.now 到 created_at，避免 SuccessView 的 countdown / interval 觸發 setState 引發
+ * act warning。所有 job 的 created_at = 2026-04-30T12:00:00Z、expires_at = +7d。
+ */
+const NOW_FIXED = new Date("2026-04-30T12:00:00Z").getTime();
+
+beforeEach(() => {
+  vi.spyOn(Date, "now").mockReturnValue(NOW_FIXED);
+  // 每個測試前清 store + 所有 mock
+  useConversionStore.getState().reset();
+  vi.clearAllMocks();
+  (toast.success as Mock).mockReset();
+  (toast.error as Mock).mockReset();
+  mockRouterPush.mockReset();
+  // 預設 getActiveConversion → null（沒有 active job）
+  mockedApi.getActiveConversion.mockResolvedValue(null);
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  vi.useRealTimers();
+  useConversionStore.getState().reset();
+});
+
+/* ========================================================================== */
+/* Test 1：Happy path — .onnx + KL720 + 0 ref images                           */
+/* ========================================================================== */
+
+describe("E2E flow — happy path（.onnx + KL720 + 0 ref images）", () => {
+  it("idle → 選檔 → 上傳 → queued → running → succeeded → 加到模型庫", async () => {
+    // 全程 fake timer — 從 startPolling 排第一個 setTimeout 到 polling lifecycle 都受控
+    // 註：fake timer 下 waitFor 會卡住（內部用 setTimeout retry），所以全用 advance + 直接 expect
+    vi.useFakeTimers();
+
+    // 上傳 mock：在 onUploadProgress 推 30% / 70% / 100% 後 resolve queued job
+    let capturedArgs: InitConversionArgs | null = null;
+    mockedApi.initConversion.mockImplementation((args: InitConversionArgs) => {
+      capturedArgs = args;
+      args.onUploadProgress?.(args.file.size * 0.3, args.file.size);
+      args.onUploadProgress?.(args.file.size * 0.7, args.file.size);
+      args.onUploadProgress?.(args.file.size, args.file.size);
+      return Promise.resolve(makeJob({ status: "queued" }));
+    });
+
+    // polling 序列：第 1 次 queued → 第 2 次 running(stage=onnx) → 第 3 次 running(stage=bie)
+    // → 第 4 次 succeeded
+    mockedApi.getConversion
+      .mockResolvedValueOnce(makeJob({ status: "queued" }))
+      .mockResolvedValueOnce(
+        makeJob({ status: "running", stage: "onnx", progress: 25 }),
+      )
+      .mockResolvedValueOnce(
+        makeJob({ status: "running", stage: "bie", progress: 60 }),
+      )
+      .mockResolvedValueOnce(
+        makeJob({
+          status: "succeeded",
+          result: {
+            output_size_bytes: 12_300_000,
+            output_checksum: "sha256:e2eaaaabbbb111222333",
+          },
+        }),
+      );
+
+    renderApp();
+
+    // === Step 1：bootstrap → idle / IdleForm 顯示 ===
+    // bootstrap promise + React effects 走完需要 flush microtask
+    await vi.advanceTimersByTimeAsync(0);
+    expect(screen.getByTestId("conversion-idle-form")).toBeTruthy();
+    expect(mockedApi.getActiveConversion).toHaveBeenCalled();
+
+    // === Step 2：選 onnx 檔（KL720 是預設 chip） ===
+    const file = makeFile("yolov5s.onnx", 5 * 1024 * 1024);
+    setInputFiles(getModelInput(), [file]);
+
+    expect(screen.getByTestId("model-selected")).toBeTruthy();
+    const taskInput = screen.getByTestId("task-name-input") as HTMLInputElement;
+    expect(taskInput.value).toBe("yolov5s");
+    expect(screen.getByTestId("chip-kl720").getAttribute("data-checked")).toBe(
+      "true",
+    );
+
+    // === Step 3：點開始轉檔 → 上傳 + 切到 ProcessingView (queued) ===
+    fireEvent.click(screen.getByTestId("conversion-start"));
+
+    // upload promise 是 microtask，flush 需 advance 0ms
+    await vi.advanceTimersByTimeAsync(0);
+    const queuedView = screen.getByTestId("conversion-processing");
+    expect(queuedView.getAttribute("data-phase")).toBe("queued");
+
+    expect(mockedApi.initConversion).toHaveBeenCalledTimes(1);
+    expect(capturedArgs!.file).toBe(file);
+    expect(capturedArgs!.targetChip).toBe<TargetChip>("KL720");
+    expect(capturedArgs!.taskName).toBe("yolov5s");
+    expect(capturedArgs!.refImages).toBeUndefined();
+
+    // === 第 1 次 polling：advance 10s（queued 間隔） → mock 第 1 筆（queued）===
+    await vi.advanceTimersByTimeAsync(10_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(1);
+
+    // === 第 2 次 polling：仍是 queued，10s 間隔 → mock 第 2 筆（running）===
+    await vi.advanceTimersByTimeAsync(10_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(2);
+    expect(
+      screen.getByTestId("conversion-processing").getAttribute("data-phase"),
+    ).toBe("running");
+
+    // === 第 3 次 polling：running 5s 間隔 ===
+    await vi.advanceTimersByTimeAsync(5_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(3);
+
+    // === 第 4 次 polling：running → succeeded ===
+    await vi.advanceTimersByTimeAsync(5_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(4);
+
+    expect(screen.getByTestId("conversion-success")).toBeTruthy();
+    expect(screen.getByTestId("success-import-button")).toBeTruthy();
+    expect(screen.getByTestId("success-download-button")).toBeTruthy();
+
+    // 後續不再 polling（30s 內沒新 call）
+    mockedApi.getConversion.mockClear();
+    await vi.advanceTimersByTimeAsync(30_000);
+    expect(mockedApi.getConversion).not.toHaveBeenCalled();
+
+    // === Step 5：點「加到模型庫」→ PromoteDialog → 確認 promote ===
+    // TD-17: 切 useRealTimers 前先 clearAllTimers，避免 fake timers 殘留 callback
+    // 在 real timers 模式下意外觸發
+    vi.clearAllTimers();
+    vi.useRealTimers();
+    mockedApi.promoteConversionToModels.mockResolvedValue({
+      model_id: "model-from-onnx",
+    });
+
+    fireEvent.click(screen.getByTestId("success-import-button"));
+    expect(screen.getByTestId("promote-dialog")).toBeTruthy();
+    const nameInput = screen.getByTestId(
+      "promote-dialog-name",
+    ) as HTMLInputElement;
+    expect(nameInput.value).toBe("yolov5s_kl720");
+
+    fireEvent.click(screen.getByTestId("promote-dialog-confirm"));
+
+    await waitFor(() => {
+      expect(mockedApi.promoteConversionToModels).toHaveBeenCalledWith(
+        "job-e2e-1",
+        { name: "yolov5s_kl720" },
+      );
+    });
+    await waitFor(() => {
+      expect(toast.success as Mock).toHaveBeenCalled();
+    });
+    await waitFor(() => {
+      expect(screen.queryByTestId("promote-dialog")).toBeNull();
+    });
+
+    // === Step 6：「下載」<a href> 指向 /api/conversion/{jobId}/download ===
+    const downloadBtn = screen.getByTestId("success-download-button");
+    const anchor =
+      downloadBtn.tagName.toLowerCase() === "a"
+        ? (downloadBtn as HTMLAnchorElement)
+        : (downloadBtn.querySelector("a") as HTMLAnchorElement | null);
+    expect(anchor).toBeTruthy();
+    expect(anchor!.getAttribute("href")).toBe(
+      "/api/conversion/job-e2e-1/download",
+    );
+  });
+});
+
+/* ========================================================================== */
+/* Test 2：Variant — .onnx + KL720 + 5 ref images                              */
+/* ========================================================================== */
+
+describe("E2E flow — variant（5 ref images）", () => {
+  it("帶 5 張 ref images → initConversion 收到 refImages 5 個", async () => {
+    // TD-18: 這個 test 故意用 shouldAdvanceTime: true 模式（不同於其他 test 的純 fake timer）
+    // 因為這條 path 不需要驗 polling tick，只看 form submit → store init → mock 立刻 succeed；
+    // shouldAdvanceTime 讓 microtask queue / timer 自動前進，避免每個 await 後手動 advance。
+    // 別把這當成「應該統一」的 anti-pattern，是這條 test 的 trade-off。
+    vi.useFakeTimers({ shouldAdvanceTime: true });
+
+    let capturedArgs: InitConversionArgs | null = null;
+    mockedApi.initConversion.mockImplementation((args: InitConversionArgs) => {
+      capturedArgs = args;
+      // 即時 resolve 成 succeeded（converter 極快情境也合法 — store 會直接切 succeeded）
+      return Promise.resolve(
+        makeJob({
+          status: "succeeded",
+          result: { output_size_bytes: 9_876_543 },
+        }),
+      );
+    });
+
+    renderApp();
+    await waitFor(() => {
+      expect(screen.getByTestId("conversion-idle-form")).toBeTruthy();
+    });
+
+    // === Step 1：選 onnx ===
+    const file = makeFile("mobilenet.onnx", 8 * 1024 * 1024);
+    setInputFiles(getModelInput(), [file]);
+
+    // === Step 2：選 5 張 ref images ===
+    const refs = [
+      makeImage("ref-1.png", 200 * 1024),
+      makeImage("ref-2.png", 250 * 1024),
+      makeImage("ref-3.png", 300 * 1024),
+      makeImage("ref-4.png", 180 * 1024),
+      makeImage("ref-5.png", 220 * 1024),
+    ];
+    setInputFiles(getRefImagesInput(), refs);
+
+    // 確認 ref images 已被收下
+    const summary = screen.getByTestId("ref-images-selected");
+    expect(summary.textContent).toContain("ref-1.png");
+    expect(summary.textContent).toContain("ref-5.png");
+
+    // === Step 3：開始轉檔 ===
+    fireEvent.click(screen.getByTestId("conversion-start"));
+
+    // 切 uploading（短暫）→ 直接到 succeeded
+    await waitFor(() => {
+      expect(screen.getByTestId("conversion-success")).toBeTruthy();
+    });
+
+    // === Step 4：驗 initConversion 收到 5 張 ref images ===
+    expect(mockedApi.initConversion).toHaveBeenCalledTimes(1);
+    expect(capturedArgs!.refImages).toBeDefined();
+    expect(capturedArgs!.refImages).toHaveLength(5);
+    expect(capturedArgs!.refImages![0].name).toBe("ref-1.png");
+    expect(capturedArgs!.refImages![4].name).toBe("ref-5.png");
+    expect(capturedArgs!.targetChip).toBe<TargetChip>("KL720");
+  });
+});
+
+/* ========================================================================== */
+/* Test 3：上傳失敗 → idle + form 保留 → user retry 成功                        */
+/* ========================================================================== */
+
+describe("E2E flow — upload fails → retry 成功", () => {
+  it("上傳 5xx 失敗 → toast.error 顯示 → 切回 idle → user 重選後可再次提交", async () => {
+    // 第 1 次：rejected with 500
+    // 第 2 次：成功（succeeded — 為了流程簡單，直接結尾）
+    mockedApi.initConversion
+      .mockRejectedValueOnce(
+        new ConversionAPIError(500, "internal_error", "boom"),
+      )
+      .mockResolvedValueOnce(
+        makeJob({
+          status: "succeeded",
+          result: { output_size_bytes: 1_000_000 },
+        }),
+      );
+
+    renderApp();
+    await waitFor(() => {
+      expect(screen.getByTestId("conversion-idle-form")).toBeTruthy();
+    });
+
+    // === 第 1 次：選檔 → 點開始 → 失敗 ===
+    const file = makeFile("retry.onnx", 5 * 1024 * 1024);
+    setInputFiles(getModelInput(), [file]);
+    fireEvent.click(screen.getByTestId("conversion-start"));
+
+    // store 切回 idle + error 寫入；page.tsx 的 effect 顯示 toast
+    await waitFor(() => {
+      expect(toast.error as Mock).toHaveBeenCalled();
+    });
+
+    // toast 訊息含「上傳失敗」字樣
+    const [msg] = (toast.error as Mock).mock.calls[0];
+    expect(typeof msg).toBe("string");
+    expect((msg as string).length).toBeGreaterThan(0);
+
+    // 確認回到 idle 視圖
+    await waitFor(() => {
+      expect(screen.getByTestId("conversion-idle-form")).toBeTruthy();
+    });
+    // 不在 uploading / processing / success / failed
+    expect(screen.queryByTestId("conversion-uploading")).toBeNull();
+    expect(screen.queryByTestId("conversion-processing")).toBeNull();
+    expect(screen.queryByTestId("conversion-success")).toBeNull();
+    expect(screen.queryByTestId("conversion-failed")).toBeNull();
+
+    // === 第 2 次：重選檔（idle 後 IdleForm 是新 mount）→ 再點開始 → 走到成功 ===
+    // 註：page.tsx 把 uploading / idle 用 conditional render 切換，IdleForm 從 uploading
+    // 切回 idle 時是新 instance，local state 重置；user 需重新選檔（與既有產品行為一致）。
+    const file2 = makeFile("retry-2.onnx", 4 * 1024 * 1024);
+    setInputFiles(getModelInput(), [file2]);
+    fireEvent.click(screen.getByTestId("conversion-start"));
+
+    await waitFor(() => {
+      expect(screen.getByTestId("conversion-success")).toBeTruthy();
+    });
+
+    // initConversion 被叫了 2 次（第 1 次失敗 + 第 2 次成功）
+    expect(mockedApi.initConversion).toHaveBeenCalledTimes(2);
+  });
+});
+
+/* ========================================================================== */
+/* Test 4：polling 5xx → 指數退避 → 恢復後繼續                                  */
+/* ========================================================================== */
+
+describe("E2E flow — polling 失敗指數退避 + 恢復", () => {
+  it("running → 連 2 次 5xx → 第 3 次成功 → UI 不切 failed，繼續顯示 running", async () => {
+    // 全程 fake timer（包含 bootstrap 後 startPolling 排的第一個 setTimeout）
+    vi.useFakeTimers();
+
+    // 模擬：bootstrap 直接拿到一個 running 的 job（跳過 upload）
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "running", stage: "bie", progress: 50 }),
+    );
+
+    // polling 序列：第 1 次成功 (running 70%) → 第 2-3 次 5xx → 第 4 次成功 (running 90%)
+    mockedApi.getConversion
+      .mockResolvedValueOnce(
+        makeJob({ status: "running", stage: "bie", progress: 70 }),
+      )
+      .mockRejectedValueOnce(
+        new ConversionAPIError(503, "service_unavailable", "transient"),
+      )
+      .mockRejectedValueOnce(
+        new ConversionAPIError(503, "service_unavailable", "transient"),
+      )
+      .mockResolvedValueOnce(
+        makeJob({ status: "running", stage: "nef", progress: 90 }),
+      );
+
+    renderApp();
+
+    // bootstrap promise + React effects 走完需要 flush microtask
+    await vi.advanceTimersByTimeAsync(0);
+    expect(
+      screen.getByTestId("conversion-processing").getAttribute("data-phase"),
+    ).toBe("running");
+
+    // === 第 1 次 poll：5s 後（running 間隔）→ 成功 (running 70%) ===
+    await vi.advanceTimersByTimeAsync(5_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(1);
+    expect(useConversionStore.getState().pollErrorCount).toBe(0);
+
+    // === 第 2 次 poll：5s 後 → 5xx → pollErrorCount=1 ===
+    await vi.advanceTimersByTimeAsync(5_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(2);
+    expect(useConversionStore.getState().pollErrorCount).toBe(1);
+    // UI 仍是 running — 不切 failed
+    expect(
+      screen.getByTestId("conversion-processing").getAttribute("data-phase"),
+    ).toBe("running");
+
+    // === 第 3 次 poll：失敗後排 10s（10 * 2^0），先推 9s 不該觸發 ===
+    await vi.advanceTimersByTimeAsync(9_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(2);
+    // 推到 11s 總共 → 觸發第 3 次（仍 5xx）
+    await vi.advanceTimersByTimeAsync(2_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(3);
+    expect(useConversionStore.getState().pollErrorCount).toBe(2);
+
+    // === 第 4 次 poll：失敗後排 20s（10 * 2^1），推 21s 觸發 → 成功（running 90%）===
+    // pollErrorCount 重設為 0（成功 case 在 store 內 setState 重設）
+    await vi.advanceTimersByTimeAsync(21_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(4);
+    expect(useConversionStore.getState().pollErrorCount).toBe(0);
+
+    // TD-19: 也驗 pollVisibleError flag — 連續 5xx 沒到 GIVE_UP_VISIBLE_THRESHOLD（store 預設 ≥3 才標 true）
+    // 本 test 連續 2 次 5xx 後就成功，因此 pollVisibleError 應為 false（沒讓 user 看到「retrying」UI）
+    expect(useConversionStore.getState().pollVisibleError).toBe(false);
+
+    // UI 仍 running — 沒被 transient 5xx 誤殺成 failed
+    expect(
+      screen.getByTestId("conversion-processing").getAttribute("data-phase"),
+    ).toBe("running");
+  });
+});
+
+/* ========================================================================== */
+/* Test 5：bootstrap 拿到 expired job → ExpiredView → reset 回 idle             */
+/* ========================================================================== */
+
+describe("E2E flow — expired job 邊界", () => {
+  it("bootstrap 拿到一個過期 job → ExpiredView → 點重新轉檔回 idle", async () => {
+    // expires_at 在 NOW_FIXED 之前 → store 直接切 expired
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({
+        status: "succeeded",
+        expires_at: "2026-04-23T12:00:00Z", // 比 NOW_FIXED 早 7 天
+        result: { output_size_bytes: 5_000_000 },
+      }),
+    );
+
+    renderApp();
+
+    // 等 ExpiredView 顯示
+    await waitFor(() => {
+      expect(screen.getByTestId("conversion-expired")).toBeTruthy();
+    });
+    expect(screen.getByTestId("expired-hero")).toBeTruthy();
+
+    // 摘要顯示原始檔名 + chip
+    const summary = screen.getByTestId("expired-summary");
+    expect(within(summary).getByTestId("expired-source-filename").textContent).toContain(
+      "yolov5s.onnx",
+    );
+    expect(within(summary).getByTestId("expired-target-chip").textContent).toContain(
+      "KL720",
+    );
+
+    // 點「重新轉檔」→ store.reset() → 切回 idle
+    fireEvent.click(screen.getByTestId("expired-start-new"));
+
+    await waitFor(() => {
+      expect(screen.getByTestId("conversion-idle-form")).toBeTruthy();
+    });
+    // ExpiredView 已被卸載
+    expect(screen.queryByTestId("conversion-expired")).toBeNull();
+  });
+});
diff --git a/visionA-frontend/src/app/conversion/page.test.tsx b/visionA-frontend/src/app/conversion/page.test.tsx
new file mode 100644
index 0000000..fa82965
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/page.test.tsx
@@ -0,0 +1,368 @@
+/**
+ * /conversion 頁單元測試（Phase 0.8 F-T4 + F-T9）
+ *
+ * 對齊：
+ *   - flow-conversion.md §5.1 idle bootstrap
+ *   - flow-conversion.md §4 state machine
+ *   - flow-conversion.md §6.2（上傳失敗 toast）
+ *   - flow-conversion.md §6.4（多 tab 一致性）
+ *
+ * 覆蓋（F-T4）：
+ *   - mount → 呼叫 store.bootstrap()（一次）
+ *   - isInitializing=true → 顯示 loading skeleton
+ *   - 各 uiState → 顯示對應 view
+ *
+ * 覆蓋（F-T9 sub-3 / sub-4）：
+ *   - store.error null → 非 null：toast.error 觸發一次（不重複）
+ *   - error.code='aborted' / 'active_job_exists' 不 toast
+ *   - 多 tab：頁面 mount 各自獨立 bootstrap（兩個 tab 都會呼叫 store.bootstrap）
+ *
+ * 不負責：
+ *   - IdleForm 自己的行為（已在 IdleForm.test.tsx 測）
+ */
+
+import { render, screen } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import type { Mock } from "vitest";
+
+import { LocaleProvider } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+
+// SuccessView 與 FailedView 內部使用 next/navigation 的 useRouter；jsdom 沒有 app router
+// context，需 mock 一個極簡 stub 才能讓 succeeded / failed 分支被渲染。
+vi.mock("next/navigation", () => ({
+  useRouter: () => ({
+    push: vi.fn(),
+    replace: vi.fn(),
+    back: vi.fn(),
+    forward: vi.fn(),
+    refresh: vi.fn(),
+    prefetch: vi.fn(),
+  }),
+}));
+
+// Mock sonner — 攔截 toast.error 的呼叫（F-T9 sub-3）
+vi.mock("sonner", () => {
+  return {
+    toast: Object.assign(vi.fn(), {
+      success: vi.fn(),
+      error: vi.fn(),
+      warning: vi.fn(),
+      info: vi.fn(),
+      message: vi.fn(),
+    }),
+    Toaster: () => null,
+  };
+});
+
+import { toast } from "sonner";
+
+import ConversionPage from "./page";
+
+function renderPage() {
+  return render(
+    <LocaleProvider>
+      <ConversionPage />
+    </LocaleProvider>,
+  );
+}
+
+beforeEach(() => {
+  useConversionStore.getState().reset();
+  (toast.error as Mock).mockReset();
+  (toast.success as Mock).mockReset();
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+  useConversionStore.getState().reset();
+});
+
+describe("<ConversionPage />", () => {
+  it("mount 時呼叫 store.bootstrap()", () => {
+    const bootstrap = vi
+      .spyOn(useConversionStore.getState(), "bootstrap")
+      .mockImplementation(async () => {});
+    useConversionStore.setState({ bootstrap });
+
+    renderPage();
+    expect(bootstrap).toHaveBeenCalledTimes(1);
+  });
+
+  it("isInitializing=true → 顯示 loading skeleton（不渲 IdleForm）", () => {
+    useConversionStore.setState({
+      isInitializing: true,
+      bootstrap: vi.fn(async () => {}),
+    });
+
+    renderPage();
+    expect(screen.getByTestId("conversion-loading")).toBeTruthy();
+    expect(screen.queryByTestId("conversion-idle-form")).toBeNull();
+  });
+
+  it("uiState=idle 且非 initializing → 顯示 IdleForm", () => {
+    useConversionStore.setState({
+      uiState: "idle",
+      isInitializing: false,
+      bootstrap: vi.fn(async () => {}),
+    });
+
+    renderPage();
+    expect(screen.getByTestId("conversion-idle-form")).toBeTruthy();
+    // 沒進度 / 結果 placeholder
+    expect(screen.queryByTestId("conversion-processing")).toBeNull();
+    expect(screen.queryByTestId("conversion-loading")).toBeNull();
+  });
+
+  it("uiState=uploading → 顯示 UploadingView（F-T5）", () => {
+    useConversionStore.setState({
+      uiState: "uploading",
+      isInitializing: false,
+      uploadProgress: { loaded: 0, total: 1024 },
+      bootstrap: vi.fn(async () => {}),
+    });
+
+    renderPage();
+    expect(screen.getByTestId("conversion-uploading")).toBeTruthy();
+    // 不渲染 ProcessingView / IdleForm
+    expect(screen.queryByTestId("conversion-processing")).toBeNull();
+    expect(screen.queryByTestId("conversion-idle-form")).toBeNull();
+  });
+
+  it("uiState=queued → 顯示 ProcessingView（F-T6）", () => {
+    useConversionStore.setState({
+      uiState: "queued",
+      isInitializing: false,
+      job: {
+        job_id: "job-q",
+        status: "queued",
+        source_filename: "yolov5s.onnx",
+        target_chip: "KL720",
+        created_at: new Date().toISOString(),
+        expires_at: new Date(Date.now() + 7 * 86400_000).toISOString(),
+      },
+      bootstrap: vi.fn(async () => {}),
+    });
+
+    renderPage();
+    const view = screen.getByTestId("conversion-processing");
+    expect(view).toBeTruthy();
+    expect(view.getAttribute("data-phase")).toBe("queued");
+  });
+
+  it("uiState=running → 顯示 ProcessingView（F-T6）", () => {
+    useConversionStore.setState({
+      uiState: "running",
+      isInitializing: false,
+      job: {
+        job_id: "job-r",
+        status: "running",
+        stage: "bie",
+        progress: 45,
+        source_filename: "yolov5s.onnx",
+        target_chip: "KL720",
+        created_at: new Date().toISOString(),
+        expires_at: new Date(Date.now() + 7 * 86400_000).toISOString(),
+      },
+      bootstrap: vi.fn(async () => {}),
+    });
+
+    renderPage();
+    const view = screen.getByTestId("conversion-processing");
+    expect(view).toBeTruthy();
+    expect(view.getAttribute("data-phase")).toBe("running");
+  });
+
+  it("uiState=succeeded → 顯示 SuccessView（F-T7 已接）", () => {
+    useConversionStore.setState({
+      uiState: "succeeded",
+      isInitializing: false,
+      job: {
+        job_id: "job-s",
+        status: "succeeded",
+        source_filename: "yolov5s.onnx",
+        target_chip: "KL720",
+        created_at: new Date().toISOString(),
+        expires_at: new Date(Date.now() + 7 * 86400_000).toISOString(),
+        result: { output_size_bytes: 12_300_000 },
+      },
+      bootstrap: vi.fn(async () => {}),
+    });
+
+    renderPage();
+    expect(screen.getByTestId("conversion-success")).toBeTruthy();
+  });
+
+  it("uiState=failed → 顯示 FailedView（F-T8 已接）", () => {
+    useConversionStore.setState({
+      uiState: "failed",
+      isInitializing: false,
+      job: {
+        job_id: "abcdef12-3456-7890-aaaa-bbbbccccdddd",
+        status: "failed",
+        source_filename: "yolov5s.onnx",
+        target_chip: "KL720",
+        created_at: new Date().toISOString(),
+        expires_at: new Date(Date.now() + 7 * 86400_000).toISOString(),
+        error: { code: "QUANTIZATION_FAILED" },
+      },
+      bootstrap: vi.fn(async () => {}),
+    });
+
+    renderPage();
+    expect(screen.getByTestId("conversion-failed")).toBeTruthy();
+    // FailedView 才有的 hero / restart 按鈕
+    expect(screen.getByTestId("failed-hero")).toBeTruthy();
+    expect(screen.getByTestId("failed-restart")).toBeTruthy();
+  });
+
+  it("uiState=expired → 顯示 ExpiredView（F-T9 sub-1）", () => {
+    useConversionStore.setState({
+      uiState: "expired",
+      isInitializing: false,
+      job: {
+        job_id: "job-x",
+        status: "succeeded",
+        source_filename: "yolov5s.onnx",
+        target_chip: "KL720",
+        created_at: "2026-04-23T00:00:00Z",
+        expires_at: "2026-04-30T00:00:00Z", // 已過期
+      },
+      bootstrap: vi.fn(async () => {}),
+    });
+
+    renderPage();
+    // ExpiredView 提供的 hero / 按鈕
+    expect(screen.getByTestId("conversion-expired")).toBeTruthy();
+    expect(screen.getByTestId("expired-hero")).toBeTruthy();
+    expect(screen.getByTestId("expired-start-new")).toBeTruthy();
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* F-T9 sub-3：上傳失敗 toast                                                   */
+/* -------------------------------------------------------------------------- */
+
+describe("<ConversionPage /> — error toast (F-T9 sub-3)", () => {
+  it("一般錯誤（status >= 500）→ 顯示「上傳失敗」toast", () => {
+    useConversionStore.setState({
+      uiState: "idle",
+      isInitializing: false,
+      error: {
+        code: "internal_error",
+        status: 500,
+        message: "internal",
+      },
+      bootstrap: vi.fn(async () => {}),
+    });
+    renderPage();
+
+    expect(toast.error).toHaveBeenCalledTimes(1);
+    const [msg] = (toast.error as Mock).mock.calls[0];
+    expect(msg).toMatch(/上傳失敗/);
+  });
+
+  it("network 錯誤（status=0）→ toast 顯示網路錯誤訊息", () => {
+    useConversionStore.setState({
+      uiState: "idle",
+      isInitializing: false,
+      error: {
+        code: "network",
+        status: 0,
+      },
+      bootstrap: vi.fn(async () => {}),
+    });
+    renderPage();
+
+    expect(toast.error).toHaveBeenCalledTimes(1);
+    const [msg, opts] = (toast.error as Mock).mock.calls[0];
+    expect(msg).toMatch(/網路錯誤|上傳失敗/);
+    // 描述包含 retryHint（F-T9 M1：toast 文案改成「請重新選擇檔案」對齊真實行為 —
+    // metadata 由 store.formDraft 保留、File 物件需重選）
+    expect(opts?.description).toMatch(/重新選擇檔案|re-select/i);
+  });
+
+  it("error.code='aborted' 不 toast（取消上傳）", () => {
+    useConversionStore.setState({
+      uiState: "idle",
+      isInitializing: false,
+      error: {
+        code: "aborted",
+        status: 0,
+      },
+      bootstrap: vi.fn(async () => {}),
+    });
+    renderPage();
+
+    expect(toast.error).not.toHaveBeenCalled();
+  });
+
+  it("error.code='active_job_exists' 不 toast（已由 banner 提示）", () => {
+    useConversionStore.setState({
+      // active_job_exists 後 store 會走 bootstrap → 切到 queued/running；
+      // 這裡測 page 邏輯，模擬 idle + 該 code 仍存在的極端情況
+      uiState: "idle",
+      isInitializing: false,
+      error: {
+        code: "active_job_exists",
+        status: 409,
+      },
+      bootstrap: vi.fn(async () => {}),
+    });
+    renderPage();
+
+    expect(toast.error).not.toHaveBeenCalled();
+  });
+
+  it("同一個 error reference 不會 toast 兩次（避免重複觸發）", () => {
+    const errObj = { code: "internal_error", status: 500, message: "x" };
+    useConversionStore.setState({
+      uiState: "idle",
+      isInitializing: false,
+      error: errObj,
+      bootstrap: vi.fn(async () => {}),
+    });
+    const { rerender } = renderPage();
+    expect(toast.error).toHaveBeenCalledTimes(1);
+
+    // 重新 render 同一個 error reference → 不該再觸發
+    rerender(
+      <LocaleProvider>
+        <ConversionPage />
+      </LocaleProvider>,
+    );
+    expect(toast.error).toHaveBeenCalledTimes(1);
+  });
+});
+
+/* -------------------------------------------------------------------------- */
+/* F-T9 sub-4：多 tab 一致性 — 兩個 tab 都會 mount 各自的 ConversionPage         */
+/* -------------------------------------------------------------------------- */
+
+describe("<ConversionPage /> — multi-tab consistency (F-T9 sub-4)", () => {
+  it("兩個獨立 ConversionPage instance 都會呼叫 store.bootstrap()（從 backend 取一致狀態）", () => {
+    const bootstrap = vi.fn(async () => {});
+    useConversionStore.setState({ bootstrap });
+
+    // 模擬「同 user 開兩個 tab」— 兩個 ConversionPage instance 各自獨立
+    // 這裡用同一個 store（zustand 單例 — Phase 0.8 conversion 對齊：天然 cohesion，
+    // store 用 backend 當 source of truth）
+    const tabA = render(
+      <LocaleProvider>
+        <ConversionPage />
+      </LocaleProvider>,
+    );
+    const tabB = render(
+      <LocaleProvider>
+        <ConversionPage />
+      </LocaleProvider>,
+    );
+
+    // 兩個 tab 都 bootstrap（各自從 backend 取一致狀態 —— 真實環境是兩個獨立 zustand
+    // instance；jsdom 共用 store 不影響「都會 bootstrap」這個基本性質）
+    expect(bootstrap).toHaveBeenCalledTimes(2);
+
+    tabA.unmount();
+    tabB.unmount();
+  });
+});
diff --git a/visionA-frontend/src/app/conversion/page.tsx b/visionA-frontend/src/app/conversion/page.tsx
new file mode 100644
index 0000000..756b651
--- /dev/null
+++ b/visionA-frontend/src/app/conversion/page.tsx
@@ -0,0 +1,150 @@
+"use client";
+
+/**
+ * /conversion — 轉檔主頁（Phase 0.8 — feature-converter-integration）
+ *
+ * 對齊：
+ *   - Wireframe：.autoflow/03-design/wireframes/wireframe-conversion.md
+ *   - Flow：     .autoflow/03-design/flows/flow-conversion.md
+ *   - PRD：     .autoflow/02-prd/features/feature-converter-integration.md
+ *   - API：     .autoflow/04-architecture/api/api-conversion.md
+ *
+ * F-T4 範圍：
+ *   - mount → 呼叫 store.bootstrap()（從 backend 重抓 active job 重建狀態）
+ *   - 根據 store.uiState 切渲染：
+ *       - isInitializing → loading skeleton（避免 SSR/hydration 後第一幀閃 idle）
+ *       - idle           → <IdleForm />
+ *       - uploading      → <UploadingView />（F-T5：XHR 進度條 + ETA + 取消）
+ *       - queued/running → <ProcessingView />（F-T6：stage indicator + progress + tab title）
+ *       - succeeded/failed/expired → 結果 placeholder（F-T7/F-T8）
+ *
+ * F-T9 sub-3：
+ *   - 訂閱 store.error，從 null → 非 null 時顯示 toast「上傳失敗」/「無法載入」
+ *     （flow §6.2：上傳失敗 → toast + 保留 form 內容讓使用者重試）
+ *
+ * 不做：
+ *   - Upload Dialog 模式（wireframe §4 寫的是 Dialog，但 PM/Design 確認後 F-T4 改在主畫面 inline 顯示表單；
+ *     差異紀錄在交付報告，後續若 PM 認為要回 Dialog 模式再切換）
+ */
+
+import { useEffect, useRef } from "react";
+import { toast } from "sonner";
+
+import { useT } from "@/lib/i18n/context";
+import { useConversionStore } from "@/stores/conversion-store";
+
+import { ExpiredView } from "./components/ExpiredView";
+import { FailedView } from "./components/FailedView";
+import { IdleForm } from "./components/IdleForm";
+import { ProcessingView } from "./components/ProcessingView";
+import { SuccessView } from "./components/SuccessView";
+import { UploadingView } from "./components/UploadingView";
+
+export default function ConversionPage() {
+  const t = useT();
+  const uiState = useConversionStore((s) => s.uiState);
+  const isInitializing = useConversionStore((s) => s.isInitializing);
+  const bootstrap = useConversionStore((s) => s.bootstrap);
+  // F-T9 sub-3 — 上傳 / promote / bootstrap 失敗時，store 寫入 error；這裡 toast 提示
+  const error = useConversionStore((s) => s.error);
+
+  // mount 時 bootstrap（store 內部已有重複呼叫保護）
+  // Phase 0.8 conversion (見 .autoflow/03-design/flows/flow-conversion.md §5.1)
+  useEffect(() => {
+    void bootstrap();
+  }, [bootstrap]);
+
+  // F-T9 sub-3 — 監聽 store.error（null → 非 null）→ 顯示 toast
+  // 設計：
+  //   - 用 ref 記住上次看到的 error reference，避免 toast 在 re-render 時重複觸發
+  //   - error.code === 'aborted' 不 toast（取消上傳已由 cancelUpload 流程處理）
+  //   - error.code === 'active_job_exists' 不 toast（已由 banner 提示）
+  //   - 其他 error → toast「上傳失敗：{訊息}」/「無法載入轉檔狀態」
+  //
+  // F-T9 M1 修補（form 保留設計）：
+  //   - page.tsx 是條件 render（idle / uploading 各自分支），IdleForm 在 idle ↔ uploading
+  //     之間會 unmount → re-mount。原本假設「同一棵 tree」是錯的。
+  //   - 修法：IdleForm 的 metadata（chip / taskName / 上次選的檔名清單）提到 store.formDraft
+  //     —— 跨 mount 自動保留。File 物件本身不存 store（不可序列化 / unsafe），
+  //     所以失敗回 idle 後使用者仍需重選檔；toast.retryHint 文案已對齊真實行為。
+  const lastErrorRef = useRef<typeof error>(null);
+  useEffect(() => {
+    if (error === lastErrorRef.current) return;
+    lastErrorRef.current = error;
+    if (!error) return;
+
+    // 不 toast 的情況
+    if (error.code === "aborted" || error.code === "active_job_exists") return;
+
+    // 用 toastFailed 統一文案；reason 在「網路類錯誤」用人話、其他用 error code（給 ops 偵錯）
+    const isNetworkLike =
+      error.status === 0 || error.status >= 500 || error.code === "network";
+    const message = isNetworkLike
+      ? t("conversion.uploading.toastFailed").replace(
+          "{reason}",
+          t("conversion.toast.networkError"),
+        )
+      : t("conversion.uploading.toastFailed").replace(
+          "{reason}",
+          error.code,
+        );
+    toast.error(message, {
+      description: t("conversion.toast.retryHint"),
+    });
+  }, [error, t]);
+
+  return (
+    <div
+      className="mx-auto max-w-7xl space-y-6 px-6 py-8"
+      data-testid="conversion-page"
+    >
+      {/* 頁面標題 */}
+      <div className="space-y-1">
+        <h1 className="text-2xl font-bold">{t("conversion.title")}</h1>
+        <p className="text-muted-foreground text-sm">
+          {t("conversion.subtitle")}
+        </p>
+      </div>
+
+      {/* 內容區 — 依 store.uiState 切換 */}
+      <div data-ui-state={uiState}>
+        {isInitializing ? (
+          <ConversionLoadingSkeleton />
+        ) : uiState === "idle" ? (
+          <IdleForm />
+        ) : uiState === "uploading" ? (
+          <UploadingView />
+        ) : uiState === "queued" || uiState === "running" ? (
+          <ProcessingView />
+        ) : uiState === "succeeded" ? (
+          <SuccessView />
+        ) : uiState === "failed" ? (
+          <FailedView />
+        ) : uiState === "expired" ? (
+          <ExpiredView />
+        ) : null}
+      </div>
+    </div>
+  );
+}
+
+/**
+ * Loading skeleton — bootstrap 進行中時顯示，避免 SSR 第一幀閃 idle / 又秒切走的視覺跳動。
+ *
+ * 視覺與後續 IdleForm / progress card 寬度對齊（都是 max-w-7xl 容器內全寬）。
+ */
+function ConversionLoadingSkeleton() {
+  return (
+    <div
+      data-testid="conversion-loading"
+      role="status"
+      aria-busy="true"
+      className="space-y-4"
+    >
+      <div className="bg-muted h-10 w-full animate-pulse rounded-md" />
+      <div className="bg-muted h-32 w-full animate-pulse rounded-md" />
+      <div className="bg-muted h-10 w-1/3 animate-pulse rounded-md" />
+    </div>
+  );
+}
+
diff --git a/visionA-frontend/src/components/layout/sidebar.test.tsx b/visionA-frontend/src/components/layout/sidebar.test.tsx
index d1002c8..1379be2 100644
--- a/visionA-frontend/src/components/layout/sidebar.test.tsx
+++ b/visionA-frontend/src/components/layout/sidebar.test.tsx
@@ -88,7 +88,7 @@ describe("<Sidebar />", () => {
     );
   });
 
-  it("包含 pages.md 總覽規定的 6 個主導航項目", () => {
+  it("包含 pages.md 總覽規定的 7 個主導航項目（Phase 0.8 加入「轉檔」）", () => {
     usePathnameMock.mockReturnValue("/");
 
     render(
@@ -97,12 +97,15 @@ describe("<Sidebar />", () => {
       </LocaleProvider>,
     );
 
-    // nav 內部的 link 數 = 6（不含品牌 logo link）
+    // nav 內部的 link 數 = 7（不含品牌 logo link）
+    // Phase 0.8 conversion: 新增「轉檔」tab，見 .autoflow/03-design/wireframes/wireframe-conversion.md §1.1
     const nav = screen.getByRole("navigation");
     const links = nav.querySelectorAll("a");
-    expect(links).toHaveLength(6);
+    expect(links).toHaveLength(7);
 
     // 抽樣：確保 clusters 已納入（雲端版新增）
     expect(screen.getByRole("link", { name: /叢集/ })).toBeInTheDocument();
+    // 抽樣：確保「轉檔」tab 存在（Phase 0.8 新增）
+    expect(screen.getByRole("link", { name: /轉檔/ })).toBeInTheDocument();
   });
 });
diff --git a/visionA-frontend/src/components/layout/sidebar.tsx b/visionA-frontend/src/components/layout/sidebar.tsx
index 0ac5020..bb043f9 100644
--- a/visionA-frontend/src/components/layout/sidebar.tsx
+++ b/visionA-frontend/src/components/layout/sidebar.tsx
@@ -29,6 +29,7 @@ import {
   Network,
   Play,
   Settings,
+  Wand2,
   type LucideIcon,
 } from "lucide-react";
 
@@ -50,6 +51,10 @@ const NAV_ITEMS: readonly NavItem[] = [
   { href: "/", labelKey: "nav.dashboard", icon: LayoutDashboard },
   { href: "/devices", labelKey: "nav.devices", icon: Cable },
   { href: "/models", labelKey: "nav.models", icon: Boxes },
+  // Phase 0.8 conversion (見 .autoflow/03-design/wireframes/wireframe-conversion.md §1.1)：
+  // 「轉檔」放在「模型」之後，與 Models 相鄰 — 心智模型上「外部模型 → 轉檔產生模型」
+  // 是延伸動作。Icon 採 Wand2 取「魔法轉換」隱喻，與 Boxes / Cable / Play 視覺密度相近。
+  { href: "/conversion", labelKey: "nav.conversion", icon: Wand2 },
   { href: "/workspace", labelKey: "nav.workspace", icon: Play },
   { href: "/clusters", labelKey: "nav.clusters", icon: Network },
   { href: "/settings", labelKey: "nav.settings", icon: Settings },
diff --git a/visionA-frontend/src/lib/api/conversion.test.ts b/visionA-frontend/src/lib/api/conversion.test.ts
new file mode 100644
index 0000000..e489692
--- /dev/null
+++ b/visionA-frontend/src/lib/api/conversion.test.ts
@@ -0,0 +1,552 @@
+/**
+ * Conversion API Client 單元測試（Phase 0.8 F-T2）
+ *
+ * 覆蓋 5 個 endpoint：
+ *   1. initConversion — XHR multipart upload + progress / abort / 409
+ *   2. getActiveConversion — has_active true / false / 異常
+ *   3. getConversion — 200 / 403 / 404
+ *   4. promoteConversionToModels — 201 / 409 / parse 缺欄
+ *   5. getConversionDownloadURL — 純函式輸入輸出
+ */
+
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import {
+  ConversionAPIError,
+  getActiveConversion,
+  getConversion,
+  getConversionDownloadURL,
+  initConversion,
+  promoteConversionToModels,
+} from "./conversion";
+
+/* -------------------------------------------------------------------------- */
+/* XHR mock helper — 取代 jsdom 的 XMLHttpRequest                             */
+/* -------------------------------------------------------------------------- */
+
+interface MockXHRInstance {
+  open: ReturnType<typeof vi.fn>;
+  send: ReturnType<typeof vi.fn>;
+  abort: ReturnType<typeof vi.fn>;
+  setRequestHeader: ReturnType<typeof vi.fn>;
+  getResponseHeader: ReturnType<typeof vi.fn>;
+  upload: { onprogress: ((ev: ProgressEvent) => void) | null };
+  withCredentials: boolean;
+  status: number;
+  responseText: string;
+  onload: (() => void) | null;
+  onerror: (() => void) | null;
+  ontimeout: (() => void) | null;
+  // 觸發測試輔助
+  _fireLoad: (status: number, body: unknown, headers?: Record<string, string>) => void;
+  _fireError: () => void;
+  _fireProgress: (loaded: number, total: number) => void;
+  _formDataSent: FormData | null;
+}
+
+function installMockXHR(): { instances: MockXHRInstance[] } {
+  const instances: MockXHRInstance[] = [];
+
+  // 必須是真 constructor function（不能用 vi.fn().mockImplementation — 那回的是 mock，不可 `new`）
+  function MockXHR(this: MockXHRInstance) {
+    const headers: Record<string, string> = {};
+    // 直接賦值到 this，避免 this 別名被 lint 警示
+    this.open = vi.fn();
+    this.abort = vi.fn();
+    this.setRequestHeader = vi.fn();
+    this.getResponseHeader = vi.fn((k: string) => headers[k.toLowerCase()] ?? null);
+    this.upload = { onprogress: null };
+    this.withCredentials = false;
+    this.status = 0;
+    this.responseText = "";
+    this.onload = null;
+    this.onerror = null;
+    this.ontimeout = null;
+    this._formDataSent = null;
+    // send / fire* 需要持有 instance 參考；用 instance push 後再裝上
+    instances.push(this);
+    const idx = instances.length - 1;
+    this.send = vi.fn((body: unknown) => {
+      instances[idx]._formDataSent = body instanceof FormData ? body : null;
+    });
+    this._fireLoad = (status, body, hdrs) => {
+      const ref = instances[idx];
+      ref.status = status;
+      ref.responseText =
+        typeof body === "string" ? body : body == null ? "" : JSON.stringify(body);
+      if (hdrs) {
+        for (const [k, v] of Object.entries(hdrs)) headers[k.toLowerCase()] = v;
+      }
+      ref.onload?.();
+    };
+    this._fireError = () => {
+      instances[idx].onerror?.();
+    };
+    this._fireProgress = (loaded, total) => {
+      instances[idx].upload.onprogress?.({
+        lengthComputable: true,
+        loaded,
+        total,
+      } as ProgressEvent);
+    };
+  }
+
+  // 覆蓋 global XMLHttpRequest
+  (globalThis as unknown as { XMLHttpRequest: unknown }).XMLHttpRequest = MockXHR;
+  return { instances };
+}
+
+/* -------------------------------------------------------------------------- */
+/* fetch mock helper — 給 4 個非 init 的 endpoint                             */
+/* -------------------------------------------------------------------------- */
+
+function jsonResponse(body: unknown, status = 200): Response {
+  return new Response(JSON.stringify(body), {
+    status,
+    headers: { "Content-Type": "application/json" },
+  });
+}
+
+let fetchMock: ReturnType<typeof vi.fn>;
+
+beforeEach(() => {
+  fetchMock = vi.fn();
+  globalThis.fetch = fetchMock as unknown as typeof fetch;
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+});
+
+/* ========================================================================== */
+/* 1. initConversion                                                           */
+/* ========================================================================== */
+
+describe("initConversion", () => {
+  it("happy path：multipart 含 model + ref_images + platform，回 normalized Job", async () => {
+    const { instances } = installMockXHR();
+    const file = new File(["onnx-bytes"], "yolov5s.onnx", {
+      type: "application/octet-stream",
+    });
+    const ref = new File(["img"], "ref.jpg", { type: "image/jpeg" });
+
+    const promise = initConversion({
+      file,
+      refImages: [ref],
+      targetChip: "KL720",
+      taskName: "yolov5s_test",
+    });
+
+    // 確認 XHR 已建立並送 form
+    expect(instances.length).toBe(1);
+    const xhr = instances[0];
+    expect(xhr.open).toHaveBeenCalledWith(
+      "POST",
+      expect.stringMatching(/\/api\/conversion\/init$/),
+      true,
+    );
+    expect(xhr.withCredentials).toBe(true);
+
+    const form = xhr._formDataSent;
+    expect(form).toBeInstanceOf(FormData);
+    // model 檔
+    expect((form!.get("model") as File).name).toBe("yolov5s.onnx");
+    // ref_images[]（多筆同 key）
+    const refs = form!.getAll("ref_images[]");
+    expect(refs.length).toBe(1);
+    expect((refs[0] as File).name).toBe("ref.jpg");
+    // text fields — backend 用 `model_id` 欄裝 taskName、`platform` 用 wire 數字格式
+    expect(form!.get("model_id")).toBe("yolov5s_test");
+    expect(form!.get("platform")).toBe("720");
+    expect(form!.get("version")).toBe("v1.0.0");
+
+    // 模擬後端 200 回 envelope
+    xhr._fireLoad(200, {
+      success: true,
+      data: {
+        job_id: "550e8400-e29b-41d4-a716-446655440000",
+        status: "running",
+        stage: "onnx",
+        progress: 0,
+        created_at: "2026-04-30T12:00:00Z",
+        expires_at: "2026-05-07T12:00:00Z",
+        source_filename: "yolov5s.onnx",
+        target_chip: "720",
+      },
+    });
+
+    const job = await promise;
+    expect(job.job_id).toBe("550e8400-e29b-41d4-a716-446655440000");
+    expect(job.status).toBe("running");
+    expect(job.target_chip).toBe("KL720"); // wire 520→KL520 normalize
+    expect(job.stage).toBe("onnx");
+  });
+
+  it("沒給 taskName 時用檔名當 model_id", async () => {
+    const { instances } = installMockXHR();
+    const file = new File(["x"], "model.onnx");
+    const promise = initConversion({ file, targetChip: "KL520" });
+    const xhr = instances[0];
+    xhr._fireLoad(200, {
+      success: true,
+      data: {
+        job_id: "j1",
+        status: "running",
+        stage: "onnx",
+        created_at: "2026-04-30T12:00:00Z",
+        expires_at: "2026-05-07T12:00:00Z",
+        source_filename: "model.onnx",
+        target_chip: "520",
+      },
+    });
+    await promise;
+    expect(xhr._formDataSent!.get("model_id")).toBe("model.onnx");
+    expect(xhr._formDataSent!.get("platform")).toBe("520");
+  });
+
+  it("onUploadProgress 被呼叫", async () => {
+    const { instances } = installMockXHR();
+    const file = new File(["x".repeat(100)], "m.onnx");
+    const onUploadProgress = vi.fn();
+
+    const promise = initConversion({
+      file,
+      targetChip: "KL520",
+      onUploadProgress,
+    });
+
+    const xhr = instances[0];
+    xhr._fireProgress(50, 100);
+    xhr._fireProgress(100, 100);
+    xhr._fireLoad(200, {
+      success: true,
+      data: {
+        job_id: "j2",
+        status: "running",
+        stage: "onnx",
+        created_at: "2026-04-30T12:00:00Z",
+        expires_at: "2026-05-07T12:00:00Z",
+        source_filename: "m.onnx",
+        target_chip: "520",
+      },
+    });
+
+    await promise;
+    expect(onUploadProgress).toHaveBeenCalledWith(50, 100);
+    expect(onUploadProgress).toHaveBeenCalledWith(100, 100);
+    expect(onUploadProgress).toHaveBeenCalledTimes(2);
+  });
+
+  it("409 active_job_exists → throw ConversionAPIError(409, 'active_job_exists', requestId)", async () => {
+    const { instances } = installMockXHR();
+    const file = new File(["x"], "m.onnx");
+    const promise = initConversion({ file, targetChip: "KL520" });
+
+    instances[0]._fireLoad(
+      409,
+      {
+        success: false,
+        error: {
+          code: "active_job_exists",
+          message: "你已有進行中任務",
+        },
+      },
+      { "X-Request-Id": "req-abc" },
+    );
+
+    await expect(promise).rejects.toBeInstanceOf(ConversionAPIError);
+    try {
+      await promise;
+    } catch (e) {
+      const err = e as ConversionAPIError;
+      expect(err.status).toBe(409);
+      expect(err.code).toBe("active_job_exists");
+      expect(err.message).toBe("你已有進行中任務");
+      expect(err.requestId).toBe("req-abc");
+    }
+  });
+
+  it("network error → throw ConversionAPIError(0, 'network_error')", async () => {
+    const { instances } = installMockXHR();
+    const file = new File(["x"], "m.onnx");
+    const promise = initConversion({ file, targetChip: "KL520" });
+    instances[0]._fireError();
+    await expect(promise).rejects.toMatchObject({
+      name: "ConversionAPIError",
+      status: 0,
+      code: "network_error",
+    });
+  });
+
+  it("AbortSignal.abort → 呼叫 xhr.abort 並 reject ConversionAPIError(0, 'aborted')", async () => {
+    const { instances } = installMockXHR();
+    const file = new File(["x"], "m.onnx");
+    const ctrl = new AbortController();
+
+    const promise = initConversion({
+      file,
+      targetChip: "KL520",
+      signal: ctrl.signal,
+    });
+
+    ctrl.abort();
+    await expect(promise).rejects.toMatchObject({
+      name: "ConversionAPIError",
+      code: "aborted",
+    });
+    expect(instances[0].abort).toHaveBeenCalled();
+  });
+
+  it("已 abort 的 signal → 立刻 reject 不送 XHR", async () => {
+    const { instances } = installMockXHR();
+    const file = new File(["x"], "m.onnx");
+    const ctrl = new AbortController();
+    ctrl.abort();
+
+    const promise = initConversion({
+      file,
+      targetChip: "KL520",
+      signal: ctrl.signal,
+    });
+
+    await expect(promise).rejects.toMatchObject({ code: "aborted" });
+    expect(instances[0].send).not.toHaveBeenCalled();
+  });
+});
+
+/* ========================================================================== */
+/* 2. getActiveConversion                                                      */
+/* ========================================================================== */
+
+describe("getActiveConversion", () => {
+  it("has_active=true → 回 normalized Job", async () => {
+    fetchMock.mockResolvedValue(
+      jsonResponse({
+        success: true,
+        data: {
+          has_active: true,
+          job: {
+            job_id: "j-active",
+            status: "running",
+            stage: "bie",
+            progress: 45,
+            created_at: "2026-04-30T12:00:00Z",
+            expires_at: "2026-05-07T12:00:00Z",
+            source_filename: "yolov5s.onnx",
+            target_chip: "720",
+          },
+        },
+      }),
+    );
+
+    const job = await getActiveConversion();
+    expect(job).not.toBeNull();
+    expect(job!.job_id).toBe("j-active");
+    expect(job!.target_chip).toBe("KL720");
+    expect(job!.stage).toBe("bie");
+    expect(job!.progress).toBe(45);
+  });
+
+  it("has_active=false → 回 null", async () => {
+    fetchMock.mockResolvedValue(
+      jsonResponse({ success: true, data: { has_active: false, job: null } }),
+    );
+    const job = await getActiveConversion();
+    expect(job).toBeNull();
+  });
+
+  it("backend 401 → throw ConversionAPIError(401, 'unauthorized')", async () => {
+    // F-T2 review Major #1：code 統一全小寫，對齊 conversion.md §6 i18n key 命名
+    fetchMock.mockResolvedValue(new Response("", { status: 401 }));
+    await expect(getActiveConversion()).rejects.toMatchObject({
+      name: "ConversionAPIError",
+      status: 401,
+      code: "unauthorized",
+    });
+  });
+});
+
+/* ========================================================================== */
+/* 3. getConversion                                                            */
+/* ========================================================================== */
+
+describe("getConversion", () => {
+  it("成功回 normalized Job（completed → succeeded）", async () => {
+    fetchMock.mockResolvedValue(
+      jsonResponse({
+        success: true,
+        data: {
+          job_id: "j-1",
+          status: "completed",
+          progress: 100,
+          created_at: "2026-04-30T12:00:00Z",
+          expires_at: "2026-05-07T12:00:00Z",
+          source_filename: "m.onnx",
+          target_chip: "520",
+          error_code: null,
+          error_message: null,
+        },
+      }),
+    );
+
+    const job = await getConversion("j-1");
+    expect(job.status).toBe("succeeded"); // completed → succeeded
+    expect(job.target_chip).toBe("KL520");
+    expect(job.error).toBeUndefined();
+  });
+
+  it("failed 時 error_code/message 包成 error 物件", async () => {
+    fetchMock.mockResolvedValue(
+      jsonResponse({
+        success: true,
+        data: {
+          job_id: "j-2",
+          status: "failed",
+          progress: 30,
+          created_at: "2026-04-30T12:00:00Z",
+          expires_at: "2026-05-07T12:00:00Z",
+          source_filename: "m.onnx",
+          target_chip: "720",
+          error_code: "QUANTIZATION_FAILED",
+          error_message: "Custom op X not supported",
+        },
+      }),
+    );
+
+    const job = await getConversion("j-2");
+    expect(job.status).toBe("failed");
+    expect(job.error).toEqual({
+      code: "QUANTIZATION_FAILED",
+      message: "Custom op X not supported",
+    });
+  });
+
+  it("404 not_found → throw ConversionAPIError(404, 'not_found')", async () => {
+    fetchMock.mockResolvedValue(
+      jsonResponse(
+        { success: false, error: { code: "not_found", message: "任務不存在" } },
+        404,
+      ),
+    );
+    await expect(getConversion("missing")).rejects.toMatchObject({
+      name: "ConversionAPIError",
+      status: 404,
+      code: "not_found",
+    });
+  });
+
+  it("403 forbidden → throw ConversionAPIError(403, 'forbidden')", async () => {
+    fetchMock.mockResolvedValue(
+      jsonResponse(
+        { success: false, error: { code: "forbidden", message: "你無權存取此任務" } },
+        403,
+      ),
+    );
+    await expect(getConversion("other-user-job")).rejects.toMatchObject({
+      status: 403,
+      code: "forbidden",
+    });
+  });
+
+  it("空 jobId → 立刻 throw ConversionAPIError 不打 fetch", async () => {
+    await expect(getConversion("")).rejects.toMatchObject({
+      code: "validation_failed",
+    });
+    expect(fetchMock).not.toHaveBeenCalled();
+  });
+});
+
+/* ========================================================================== */
+/* 4. promoteConversionToModels                                                */
+/* ========================================================================== */
+
+describe("promoteConversionToModels", () => {
+  it("成功回 { model_id }", async () => {
+    fetchMock.mockResolvedValue(
+      jsonResponse(
+        {
+          success: true,
+          data: {
+            model_id: "m-abc-123",
+            source: "converted",
+            source_job_id: "j-1",
+            name: "yolov5s_kl720",
+            target_chip: "kl720",
+            file_size: 12345678,
+            status: "ready",
+            created_at: "2026-04-30T12:30:00Z",
+          },
+        },
+        201,
+      ),
+    );
+
+    const res = await promoteConversionToModels("j-1", { name: "yolov5s_kl720" });
+    expect(res).toEqual({ model_id: "m-abc-123" });
+
+    // 驗證 request body
+    const [, init] = fetchMock.mock.calls[0] as [string, RequestInit];
+    expect(init.method).toBe("POST");
+    expect(init.body).toBe(JSON.stringify({ name: "yolov5s_kl720" }));
+  });
+
+  it("body 省略時送空物件", async () => {
+    fetchMock.mockResolvedValue(
+      jsonResponse(
+        { success: true, data: { model_id: "m-1" } },
+        200,
+      ),
+    );
+    await promoteConversionToModels("j-2");
+    const [, init] = fetchMock.mock.calls[0] as [string, RequestInit];
+    expect(init.body).toBe("{}");
+  });
+
+  it("409 job_not_completed → throw ConversionAPIError(409, 'job_not_completed')", async () => {
+    fetchMock.mockResolvedValue(
+      jsonResponse(
+        { success: false, error: { code: "job_not_completed", message: "尚未完成" } },
+        409,
+      ),
+    );
+    await expect(promoteConversionToModels("j-3")).rejects.toMatchObject({
+      status: 409,
+      code: "job_not_completed",
+    });
+  });
+
+  it("response 缺 model_id → throw ConversionAPIError(500, 'parse_error')", async () => {
+    fetchMock.mockResolvedValue(
+      jsonResponse({ success: true, data: { source: "converted" } }, 201),
+    );
+    await expect(promoteConversionToModels("j-4")).rejects.toMatchObject({
+      code: "parse_error",
+      status: 500,
+    });
+  });
+
+  it("空 jobId → 立刻 throw 不打 fetch", async () => {
+    await expect(promoteConversionToModels("")).rejects.toMatchObject({
+      code: "validation_failed",
+    });
+    expect(fetchMock).not.toHaveBeenCalled();
+  });
+});
+
+/* ========================================================================== */
+/* 5. getConversionDownloadURL                                                 */
+/* ========================================================================== */
+
+describe("getConversionDownloadURL", () => {
+  it("組相對 URL（不含 base，給 anchor / location.href 用）", () => {
+    expect(getConversionDownloadURL("550e8400-e29b-41d4-a716-446655440000")).toBe(
+      "/api/conversion/550e8400-e29b-41d4-a716-446655440000/download",
+    );
+  });
+
+  it("encodeURIComponent 防止 jobId 含特殊字元注入", () => {
+    expect(getConversionDownloadURL("a/b?c=d")).toBe(
+      "/api/conversion/a%2Fb%3Fc%3Dd/download",
+    );
+  });
+});
diff --git a/visionA-frontend/src/lib/api/conversion.ts b/visionA-frontend/src/lib/api/conversion.ts
new file mode 100644
index 0000000..1238ada
--- /dev/null
+++ b/visionA-frontend/src/lib/api/conversion.ts
@@ -0,0 +1,442 @@
+/**
+ * Conversion API Client（Phase 0.8）
+ *
+ * 對齊：
+ *   - `.autoflow/04-architecture/api/api-conversion.md`（5 個 endpoint 完整 spec）
+ *   - `.autoflow/04-architecture/conversion.md` §6（錯誤碼 mapping）
+ *   - `.autoflow/03-design/wireframes/wireframe-conversion.md`（UI 對應）
+ *
+ * 設計原則：
+ *   1. **沿用 `@/lib/api` 的 fetch wrapper**：所有 GET / POST 走 `api.get` / `api.post`，
+ *      自動帶 `credentials: 'include'`、自動解 envelope、ApiError mapping。
+ *   2. **唯一例外是 `initConversion`**：multipart upload 需要 progress callback，
+ *      `lib/api.ts` 的 `upload()` 只支援單 Blob，因此這裡自寫 XHR multipart 版。
+ *   3. **錯誤型別**：對外暴露 `ConversionAPIError`（含 status / code / message / requestId），
+ *      讓 store / UI 用 `error.code` 對應 i18n。底層仍以 `ApiError` 為來源，convert 包一層。
+ *      _client 層不翻譯錯誤成中文_ — i18n 留在 store / UI。
+ *   4. **wire format 正規化**：backend 用 snake_case + chip 數字字串 `520` / `720`、
+ *      status `created` / `completed`；client 統一輸出 camelCase / `KL520` / `queued` / `succeeded`。
+ *   5. **download 不 fetch**：`getConversionDownloadURL` 純字串組裝，給 UI 用 `<a href>` /
+ *      `window.location.href`，server-side 302 redirect 流程詳見 api-conversion.md §4。
+ */
+
+import { ApiError, api, getApiBaseUrl } from "@/lib/api";
+import type {
+  ActiveConversionResponse,
+  ConversionJob,
+  ConversionStage,
+  ConversionStatus,
+  InitConversionArgs,
+  PromoteConversionBody,
+  PromoteConversionResult,
+  TargetChip,
+} from "@/types/conversion";
+
+/* -------------------------------------------------------------------------- */
+/* Error class                                                                */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * Conversion 專用錯誤。store / UI 用 `error.code` 對應 i18n key
+ * （`conversion.error.<code>`），不需要 client 端先翻譯。
+ *
+ * 來源：
+ *   - 底層 `ApiError`（fetch wrapper / XHR）→ wrap 成 `ConversionAPIError`
+ *   - XHR network / abort → 直接 throw 對應的 ConversionAPIError(0, "network_error" | "aborted", ...)
+ */
+export class ConversionAPIError extends Error {
+  readonly status: number;
+  readonly code: string;
+  readonly requestId?: string;
+
+  constructor(status: number, code: string, message: string, requestId?: string) {
+    super(message);
+    this.name = "ConversionAPIError";
+    this.status = status;
+    this.code = code;
+    this.requestId = requestId;
+    if (typeof Error.captureStackTrace === "function") {
+      Error.captureStackTrace(this, ConversionAPIError);
+    }
+  }
+}
+
+/** 把底層 `ApiError` 包成 `ConversionAPIError`（保留 status / code / message）
+ *
+ * code 統一全小寫 — 對齊 conversion.md §6 i18n key 命名規範（`conversion.error.<code>` 永遠小寫）。
+ * F-T2 review Major #1：原本 ApiError 路徑保留大寫（`UNAUTHORIZED`），其他錯誤 toLowerCase，
+ * 同函式兩套規範會讓 store/UI 對 i18n key 對應時要做大小寫處理。統一為小寫單一規範。
+ */
+function wrapApiError(err: unknown): ConversionAPIError {
+  if (err instanceof ConversionAPIError) return err;
+  if (err instanceof ApiError) {
+    return new ConversionAPIError(err.status, err.code.toLowerCase(), err.message);
+  }
+  // NetworkError / TimeoutError / AbortError / ParseError 都掉到這
+  if (err instanceof Error) {
+    // 用 BaseApiClientError.code（NETWORK_ERROR / TIMEOUT / ABORTED / PARSE_ERROR）
+    const maybeCode = (err as unknown as { code?: unknown }).code;
+    const code =
+      typeof maybeCode === "string" ? maybeCode.toLowerCase() : "network_error";
+    return new ConversionAPIError(0, code, err.message);
+  }
+  return new ConversionAPIError(0, "unknown", String(err));
+}
+
+/* -------------------------------------------------------------------------- */
+/* Wire format normalize                                                      */
+/* -------------------------------------------------------------------------- */
+
+/** wire `520` / `720` / `630` / `730` → UI `KL520` ... */
+function normalizeTargetChip(raw: unknown): TargetChip {
+  const v = String(raw ?? "").toUpperCase();
+  // 兩種格式都接：純數字 ("520") 或已帶 KL 前綴 ("KL520" / "kl520")
+  const num = v.startsWith("KL") ? v.slice(2) : v;
+  switch (num) {
+    case "520":
+      return "KL520";
+    case "630":
+      return "KL630";
+    case "720":
+      return "KL720";
+    case "730":
+      return "KL730";
+    default:
+      // 未知 chip 回 KL520 作 fallback（不該發生；backend schema 限制 4 種）
+      return "KL520";
+  }
+}
+
+/** UI `KL520` ... → wire `520` ... */
+function targetChipToWire(chip: TargetChip): string {
+  return chip.replace(/^KL/, "");
+}
+
+/** backend status `created` / `completed` → UI `queued` / `succeeded` */
+function normalizeStatus(raw: unknown): ConversionStatus {
+  const v = String(raw ?? "").toLowerCase();
+  switch (v) {
+    case "created":
+    case "queued":
+      return "queued";
+    case "running":
+      return "running";
+    case "completed":
+    case "succeeded":
+      return "succeeded";
+    case "failed":
+      return "failed";
+    default:
+      // 未知狀態保守當 running（讓 polling 繼續）
+      return "running";
+  }
+}
+
+function normalizeStage(raw: unknown): ConversionStage | undefined {
+  const v = String(raw ?? "").toLowerCase();
+  if (v === "onnx" || v === "bie" || v === "nef") return v;
+  return undefined;
+}
+
+/**
+ * 把 backend job DTO（snake_case）正規化為 client `ConversionJob`。
+ *
+ * 寬容讀取：同時接受 snake_case / camelCase（避免 backend 之後改格式時 client 即崩）。
+ */
+function normalizeJob(raw: unknown): ConversionJob {
+  const r = (raw ?? {}) as Record<string, unknown>;
+
+  const errorCode = (r.error_code as string | null | undefined) ?? null;
+  const errorMessage = (r.error_message as string | null | undefined) ?? null;
+
+  // result 欄位：backend Phase 0.8 spec 沒包，但留位置給未來擴充
+  const rawResult = r.result as Record<string, unknown> | undefined;
+  const result =
+    rawResult && typeof rawResult === "object"
+      ? {
+          output_size_bytes: Number(
+            rawResult.output_size_bytes ?? rawResult.outputSizeBytes ?? 0,
+          ),
+          output_checksum: (rawResult.output_checksum ??
+            rawResult.outputChecksum ??
+            undefined) as string | undefined,
+        }
+      : undefined;
+
+  const progressRaw = r.progress;
+  const progress =
+    typeof progressRaw === "number" && Number.isFinite(progressRaw)
+      ? progressRaw
+      : undefined;
+
+  return {
+    job_id: String(r.job_id ?? r.jobId ?? ""),
+    status: normalizeStatus(r.status),
+    stage: normalizeStage(r.stage),
+    progress,
+    source_filename: String(r.source_filename ?? r.sourceFilename ?? ""),
+    target_chip: normalizeTargetChip(r.target_chip ?? r.targetChip),
+    created_at: String(r.created_at ?? r.createdAt ?? ""),
+    expires_at: String(r.expires_at ?? r.expiresAt ?? ""),
+    error: errorCode ? { code: errorCode, message: errorMessage ?? undefined } : undefined,
+    result,
+  };
+}
+
+/* -------------------------------------------------------------------------- */
+/* 1. POST /api/conversion/init — multipart streaming upload (XHR)            */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * 啟動轉檔。multipart 上傳，支援 onUploadProgress callback。
+ *
+ * @see api-conversion.md §1
+ *
+ * 為什麼自寫 XHR 而不用 `lib/api.ts` 的 `upload()`：
+ *   - 既有 `upload(path, file, options)` 只接受單一 Blob，不支援 multipart 多檔 + text fields。
+ *   - fetch API 不支援 upload progress（只有 download progress），必填 XHR。
+ */
+export function initConversion(args: InitConversionArgs): Promise<ConversionJob> {
+  const url = `${getApiBaseUrl()}/api/conversion/init`;
+
+  // multipart fields — 對齊 api-conversion.md §1 表格
+  const form = new FormData();
+  form.append("model", args.file);
+  if (args.refImages && args.refImages.length > 0) {
+    for (const img of args.refImages) {
+      // backend 接 `ref_images[]`（converter 規格）— FormData 多筆同 key 即可
+      form.append("ref_images[]", img);
+    }
+  }
+  // backend 必填欄位：`model_id`（1–65535 字串使用者編號）+ `version` + `platform`
+  // task spec 用 taskName 作 model_id（轉檔任務的顯示名稱），非 model 庫的 model_id
+  form.append("model_id", args.taskName ?? args.file.name);
+  form.append("version", args.version ?? "v1.0.0");
+  form.append("platform", targetChipToWire(args.targetChip));
+
+  return new Promise((resolve, reject) => {
+    const xhr = new XMLHttpRequest();
+    xhr.open("POST", url, true);
+    // BFF cookie session — 同 `lib/api.ts` upload()
+    xhr.withCredentials = true;
+    // 不設 Content-Type，讓 browser 自動帶 boundary
+
+    if (args.onUploadProgress) {
+      xhr.upload.onprogress = (ev) => {
+        // multipart 上傳：以 ev.total 為準（含 boundary 開銷，誤差 < 1%）
+        if (ev.lengthComputable) {
+          args.onUploadProgress!(ev.loaded, ev.total);
+        }
+      };
+    }
+
+    xhr.onload = () => {
+      const requestId = xhr.getResponseHeader("X-Request-Id") ?? undefined;
+
+      if (xhr.status >= 200 && xhr.status < 300) {
+        // 解 envelope { success, data }
+        let payload: unknown = null;
+        try {
+          payload = xhr.responseText ? JSON.parse(xhr.responseText) : null;
+        } catch {
+          reject(
+            new ConversionAPIError(
+              xhr.status,
+              "parse_error",
+              "init: invalid JSON response",
+              requestId,
+            ),
+          );
+          return;
+        }
+        const env = payload as
+          | { success?: boolean; data?: unknown; error?: { code?: string; message?: string } }
+          | null;
+        if (env && env.success === true && env.data) {
+          resolve(normalizeJob(env.data));
+          return;
+        }
+        if (env && env.success === false && env.error) {
+          reject(
+            new ConversionAPIError(
+              xhr.status,
+              env.error.code ?? "unknown",
+              env.error.message ?? "init failed",
+              requestId,
+            ),
+          );
+          return;
+        }
+        // envelope 不符規範 — 視為 parse 失敗
+        reject(
+          new ConversionAPIError(
+            xhr.status,
+            "parse_error",
+            "init: unexpected envelope shape",
+            requestId,
+          ),
+        );
+      } else {
+        // non-2xx
+        let code = "unknown";
+        let message = `HTTP ${xhr.status}`;
+        try {
+          const parsed = JSON.parse(xhr.responseText) as {
+            error?: { code?: string; message?: string };
+          };
+          if (parsed?.error) {
+            code = parsed.error.code ?? code;
+            message = parsed.error.message ?? message;
+          }
+        } catch {
+          // body 非 JSON：保留預設訊息
+          if (xhr.responseText) message = xhr.responseText.slice(0, 200);
+        }
+        reject(new ConversionAPIError(xhr.status, code, message, requestId));
+      }
+    };
+
+    xhr.onerror = () => {
+      reject(
+        new ConversionAPIError(0, "network_error", `Failed to reach ${url} (network)`),
+      );
+    };
+
+    xhr.ontimeout = () => {
+      reject(new ConversionAPIError(0, "timeout", `Upload to ${url} timed out`));
+    };
+
+    if (args.signal) {
+      if (args.signal.aborted) {
+        reject(new ConversionAPIError(0, "aborted", "Request aborted before send"));
+        return;
+      }
+      args.signal.addEventListener(
+        "abort",
+        () => {
+          xhr.abort();
+          reject(new ConversionAPIError(0, "aborted", "Request aborted"));
+        },
+        { once: true },
+      );
+    }
+
+    xhr.send(form);
+  });
+}
+
+/* -------------------------------------------------------------------------- */
+/* 2. GET /api/conversion/active                                              */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * 查當前 user 的 active job — 給 frontend 在「上傳」UI 進入前 pre-check。
+ *
+ * @see api-conversion.md §5
+ *
+ * Backend 永遠回 200 + envelope；
+ *   - `data: { has_active: true,  job: {...} }` → 回 normalized Job
+ *   - `data: { has_active: false, job: null }` → 回 `null`
+ *
+ * 註：backend Phase 0.8 強化過 lazy rebuild ownership（重啟恢復），對 client 完全透明。
+ */
+export async function getActiveConversion(
+  signal?: AbortSignal,
+): Promise<ActiveConversionResponse> {
+  try {
+    const data = await api.get<{ has_active?: boolean; job?: unknown } | null>(
+      "/api/conversion/active",
+      { signal },
+    );
+    if (!data || data.has_active !== true || !data.job) return null;
+    return normalizeJob(data.job);
+  } catch (err) {
+    throw wrapApiError(err);
+  }
+}
+
+/* -------------------------------------------------------------------------- */
+/* 3. GET /api/conversion/{job_id}                                            */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * Poll 單一 job 狀態（建議 2 秒輪詢，由 store 控制節奏）。
+ *
+ * @see api-conversion.md §2
+ */
+export async function getConversion(
+  jobId: string,
+  signal?: AbortSignal,
+): Promise<ConversionJob> {
+  if (!jobId) {
+    throw new ConversionAPIError(0, "validation_failed", "jobId is required");
+  }
+  try {
+    const data = await api.get<unknown>(
+      `/api/conversion/${encodeURIComponent(jobId)}`,
+      { signal },
+    );
+    return normalizeJob(data);
+  } catch (err) {
+    throw wrapApiError(err);
+  }
+}
+
+/* -------------------------------------------------------------------------- */
+/* 4. POST /api/conversion/{job_id}/promote-to-models                         */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * 把已完成的轉檔 job 加到模型庫。冪等 — 重複呼叫同一 job_id 回同一個 model record。
+ *
+ * @see api-conversion.md §3
+ */
+export async function promoteConversionToModels(
+  jobId: string,
+  body?: PromoteConversionBody,
+  signal?: AbortSignal,
+): Promise<PromoteConversionResult> {
+  if (!jobId) {
+    throw new ConversionAPIError(0, "validation_failed", "jobId is required");
+  }
+  try {
+    // backend 回的是完整 model record（含 model_id / source / name / ...），
+    // client 只需 model_id 給 UI 跳頁；其他欄位 store fetchModels() 會重拉。
+    const raw = await api.post<{ model_id?: string; modelId?: string }>(
+      `/api/conversion/${encodeURIComponent(jobId)}/promote-to-models`,
+      body ?? {},
+      { signal },
+    );
+    const modelId = raw?.model_id ?? raw?.modelId;
+    if (!modelId) {
+      throw new ConversionAPIError(
+        500,
+        "parse_error",
+        "promote-to-models: missing model_id in response",
+      );
+    }
+    return { model_id: String(modelId) };
+  } catch (err) {
+    throw wrapApiError(err);
+  }
+}
+
+/* -------------------------------------------------------------------------- */
+/* 5. GET /api/conversion/{job_id}/download — pure URL builder                */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * 組「下載」endpoint URL — 給 UI 用 `<a href download>` 或 `window.location.href` 觸發。
+ *
+ * **注意：這是 server-side 302 redirect 的 entry point，client 不該用 fetch / XHR 打**：
+ *   - fetch redirect 跨 origin 會被 browser 攔，且 Authorization / cookie 不一定 propagate
+ *   - browser navigation（anchor / location.href）不適用 CORS，Server-side 302 即可全程串通
+ *
+ * Token 永遠不過 frontend JS — 詳見 api-conversion.md §4。
+ */
+export function getConversionDownloadURL(jobId: string): string {
+  // 不接 base URL — anchor / location.href 會自動接當前 origin（同 origin 部署）；
+  // 跨 origin dev 環境的下載走 browser navigation 也不需要 CORS。若未來要支援跨 origin，
+  // 需要改回 `${getApiBaseUrl()}/api/conversion/...` 並由 server 設適當的 redirect target。
+  return `/api/conversion/${encodeURIComponent(jobId)}/download`;
+}
diff --git a/visionA-frontend/src/lib/i18n/dictionaries/en.ts b/visionA-frontend/src/lib/i18n/dictionaries/en.ts
index 29c1de7..ae1720a 100644
--- a/visionA-frontend/src/lib/i18n/dictionaries/en.ts
+++ b/visionA-frontend/src/lib/i18n/dictionaries/en.ts
@@ -32,6 +32,7 @@ export const en: Dictionary = {
   "nav.dashboard": "Dashboard",
   "nav.devices": "Devices",
   "nav.models": "Models",
+  "nav.conversion": "Convert",
   "nav.workspace": "Workspace",
   "nav.clusters": "Clusters",
   "nav.settings": "Settings",
@@ -336,6 +337,288 @@ export const en: Dictionary = {
   "account.danger.deleteAccount.tooltip":
     "Please handle this at the Innovedus Account Center.",
 
+  // ── Conversion (Phase 0.8 — feature-converter-integration) ──
+  // Spec: .autoflow/03-design/wireframes/wireframe-conversion.md §11
+  // PRD:  .autoflow/02-prd/features/feature-converter-integration.md
+  // Scope: 5 states (idle / uploading / processing / success / failed) + 6 error code translations + expired
+  "conversion.title": "Convert",
+  "conversion.subtitle":
+    "Turn ONNX / TFLite models into .nef so they can run on Kneron edge devices.",
+
+  // idle empty state
+  "conversion.idle.heading": "No conversion in progress",
+  "conversion.idle.description":
+    "Upload an ONNX / TFLite model, pick a target Kneron chip, and we'll produce a flashable .nef file for you.",
+  "conversion.idle.cta": "Start conversion",
+  "conversion.idle.formats": "Supports .onnx / .tflite · max 500 MB",
+  "conversion.idle.about.title": "About conversion",
+  "conversion.idle.about.line1":
+    "Only one conversion job per user at a time (across tabs).",
+  "conversion.idle.about.line2":
+    "Results are downloadable for 7 days, then automatically cleared.",
+  "conversion.idle.about.line3":
+    "Conversion typically takes 1–10 minutes depending on model size.",
+
+  // Upload Dialog
+  "conversion.upload.title": "Start conversion",
+  "conversion.upload.description":
+    "Upload a model, choose a target chip, and optionally attach reference images for better accuracy.",
+  "conversion.upload.source.label": "Source model",
+  "conversion.upload.source.dropzone": "Drag .onnx / .tflite here",
+  "conversion.upload.source.or": "or",
+  "conversion.upload.source.browse": "Choose file",
+  "conversion.upload.source.formatHint":
+    "Format: .onnx · .tflite · max 500 MB",
+  "conversion.upload.source.remove": "Remove",
+  "conversion.upload.name.label": "Job name (optional)",
+  "conversion.upload.name.hint": "Display only; does not change output filename.",
+  "conversion.upload.chip.label": "Target chip",
+  "conversion.upload.refImages.label": "Reference images (optional)",
+  "conversion.upload.refImages.dropzone": "Drag images here (optional)",
+  "conversion.upload.refImages.hint":
+    "Reference images can improve quantized accuracy (max 100 images, ≤ 10 MB each).",
+  "conversion.upload.refImages.summary":
+    "{count} reference images selected ({totalSize})",
+  "conversion.upload.refImages.removeAll": "Remove all",
+  "conversion.upload.cancel": "Cancel",
+  "conversion.upload.start": "Start conversion",
+  "conversion.upload.error.noFile": "Please choose a .onnx or .tflite file.",
+  "conversion.upload.error.unsupported":
+    "Unsupported format — please use ONNX or TFLite.",
+  "conversion.upload.error.modelTooLarge":
+    "Model exceeds the 500 MB limit; please use a smaller model.",
+  "conversion.upload.error.noChip": "Please pick a target chip.",
+  "conversion.upload.error.refTooLarge":
+    "{filename} is over 10 MB — please remove or compress it.",
+  "conversion.upload.error.refTooMany":
+    "Reference images cannot exceed 100 files.",
+
+  // uploading stage (inside Dialog)
+  "conversion.uploading.title": "Uploading",
+  "conversion.uploading.heading": "Uploading to visionA…",
+  "conversion.uploading.progress": "{loaded} / {total} uploaded · {eta} remaining",
+  "conversion.uploading.almostDone": "Almost done…",
+  "conversion.uploading.warning":
+    "Please don't close this tab — the upload will be aborted.",
+  "conversion.uploading.cancel": "Cancel upload",
+  "conversion.uploading.cancelConfirm":
+    "Upload not finished — cancel anyway?",
+  "conversion.uploading.tabTitle": "visionA Cloud · Uploading ({pct}%)",
+  "conversion.uploading.toastCanceled": "Upload canceled.",
+  "conversion.uploading.toastFailed": "Upload failed: {reason}",
+  // F-T9 sub-3 / M1: upload failure toast hint
+  // M1 fix: File objects can't live in the store (non-serializable / unsafe across unmounts);
+  // chip / task name are preserved via store.formDraft, but the file itself must be re-selected.
+  "conversion.toast.retryHint":
+    "Your settings (chip / task name) are preserved — please re-select the file to retry.",
+  "conversion.toast.networkError":
+    "Network error — please check your connection and retry.",
+  "conversion.uploading.toastStarted":
+    "Conversion started (job #{shortJobId}).",
+  // F-T5: ETA / cancel confirm / beforeunload (detailed keys)
+  "conversion.uploading.subtitle": "Uploading model to visionA backend",
+  "conversion.uploading.eta.computing": "Estimating time remaining…",
+  "conversion.uploading.eta.almostDone": "Almost done…",
+  "conversion.uploading.eta.format": "{eta} remaining",
+  "conversion.uploading.progress.format": "{loaded} / {total}",
+  "conversion.uploading.info":
+    "Conversion will start automatically (typically 10–30 seconds).",
+  "conversion.uploading.cancel.confirm.title": "Cancel conversion?",
+  "conversion.uploading.cancel.confirm.message":
+    "Upload is not finished — uploaded progress will be lost. Cancel anyway?",
+  "conversion.uploading.cancel.confirm.yes": "Yes, cancel",
+  "conversion.uploading.cancel.confirm.no": "Keep uploading",
+  "conversion.uploading.warning.beforeunload":
+    "Upload not finished — leaving will abort the upload.",
+  "conversion.uploading.target": "Target: {chip}",
+  "conversion.uploading.aria.cancel": "Cancel upload",
+  "conversion.uploading.aria.progress": "Upload progress",
+  "conversion.uploading.aria.status": "Uploaded {pct}%, {eta}",
+
+  // processing stage
+  "conversion.processing.title": "Convert",
+  "conversion.processing.cardHeading": "In progress",
+  "conversion.processing.statusBadge": "Converting",
+  "conversion.processing.startedAgo": "Started {time}",
+  "conversion.processing.stage1": "Upload complete",
+  "conversion.processing.stage2": "Parsing model",
+  "conversion.processing.stage3": "Compiling NEF",
+  "conversion.processing.processing": "Processing…",
+  "conversion.processing.hint":
+    "Typically 1–10 minutes · You can leave this page; progress will resume when you return.",
+  "conversion.processing.background.title": "Feel free to walk away",
+  "conversion.processing.background.l1":
+    "We poll progress in the background (every 5–10 seconds).",
+  "conversion.processing.background.l2":
+    "The tab title will notify you on completion.",
+  "conversion.processing.background.l3":
+    "Closing this page is fine — it will resume automatically.",
+  "conversion.processing.queueLong":
+    "Queue is currently long — you can come back later.",
+  "conversion.processing.runLong":
+    "This conversion is taking a while; still running.",
+  "conversion.processing.pollFailed":
+    "Couldn't fetch conversion status — please retry.",
+  "conversion.processing.bannerActive":
+    "A conversion was still running when you left.",
+  "conversion.processing.bannerExisting":
+    "You already have a conversion in progress — switched to that job.",
+  // F-T9 sub-2: banner dismiss button a11y label
+  "conversion.processing.bannerDismiss": "Dismiss notice",
+
+  // F-T6: ProcessingView (queued / running shared UI)
+  "conversion.processing.subtitle":
+    "Conversion in progress — please keep this page open",
+  "conversion.processing.queued": "Queued…",
+  "conversion.processing.stage.onnx": "Parsing model",
+  "conversion.processing.stage.bie": "Quantize & compile",
+  "conversion.processing.stage.nef": "Compile NEF",
+  "conversion.processing.stage.status.completed": "Done",
+  "conversion.processing.stage.status.current": "In progress",
+  "conversion.processing.stage.status.pending": "Pending",
+  "conversion.processing.stage.aria.completed": "{name} (completed)",
+  "conversion.processing.stage.aria.current": "{name} (in progress)",
+  "conversion.processing.stage.aria.pending": "{name} (pending)",
+  "conversion.processing.eta.pending": "Please wait",
+  "conversion.processing.eta.computing": "Estimating time remaining",
+  "conversion.processing.expiryHint":
+    "Job will be auto-deleted in 7 days — please download or add it to your model library before then.",
+  "conversion.processing.tabTitle.prefix": "(Converting) ",
+  "conversion.processing.aria.progressIndeterminate":
+    "Conversion in progress; remaining time unknown",
+  "conversion.processing.aria.queueProgress":
+    "Queued, waiting for conversion to start",
+  "conversion.processing.targetChipPrefix": "→",
+
+  // active job hint (also shown on idle)
+  "conversion.busy.title": "You already have a conversion in progress",
+  "conversion.busy.cta": "View progress",
+
+  // success
+  "conversion.success.heading": "Conversion complete",
+  "conversion.success.summary.chip": "Target chip",
+  "conversion.success.summary.size": "Output size",
+  "conversion.success.summary.duration": "Duration",
+  "conversion.success.summary.checksum": "checksum",
+  "conversion.success.summary.jobId": "Job",
+  "conversion.success.nextStep": "What's next?",
+  "conversion.success.import.title": "Add to model library",
+  "conversion.success.import.description":
+    "You can deploy it from the model library to any {chip} device.",
+  "conversion.success.import.cta": "Add to library",
+  "conversion.success.import.dialog.title": "Add to model library",
+  "conversion.success.import.dialog.description":
+    "Add this conversion result to the model library so you can deploy it to {chip} devices.",
+  "conversion.success.import.dialog.nameLabel": "Model name",
+  "conversion.success.import.dialog.nameHint":
+    "Display name in the model library; up to 100 characters; cannot contain / or \\.",
+  "conversion.success.import.dialog.nameError.required": "Please enter a model name.",
+  "conversion.success.import.dialog.nameError.tooLong":
+    "Model name must be 100 characters or fewer.",
+  "conversion.success.import.dialog.nameError.invalidChars":
+    "Model name cannot contain / or \\.",
+  "conversion.success.import.dialog.descLabel": "Description (optional)",
+  "conversion.success.import.dialog.sourceLabel": "Source",
+  "conversion.success.import.dialog.sourceValue":
+    "Conversion (job #{shortJobId})",
+  "conversion.success.import.dialog.confirm": "Add to library",
+  "conversion.success.import.dialog.cancel": "Cancel",
+  "conversion.success.import.processing": "Processing…",
+  "conversion.success.import.toastDone": "Added to model library.",
+  "conversion.success.import.toastDoneAction": "Open model library →",
+  "conversion.success.import.toastDup":
+    "This job has already been added to the library.",
+  "conversion.success.import.toastDupAction": "View existing model →",
+  "conversion.success.import.statusDone": "✓ Added (open it →)",
+  "conversion.success.import.errorGeneric":
+    "Couldn't add to model library; please try again.",
+  "conversion.success.import.aria.cta":
+    "Add to model library (opens a confirmation dialog)",
+  "conversion.success.download.title": "Download .nef",
+  "conversion.success.description":
+    "{source} has been converted into a .nef compatible with {chip}.",
+  "conversion.success.summary.outputFile": "Output file",
+  "conversion.success.summary.notAvailable": "—",
+  "conversion.success.download.description":
+    "Save it locally to use elsewhere.",
+  "conversion.success.download.cta": "Download",
+  "conversion.success.download.preparing": "Preparing download…",
+  "conversion.success.download.toastStart": "Download started.",
+  "conversion.success.download.toastHint":
+    "If no download prompt appears, check your browser settings.",
+  "conversion.success.download.toastFail": "Couldn't fetch download link.",
+  "conversion.success.download.aria.cta": "Download .nef file to your computer",
+  "conversion.success.download.aria.disabled":
+    "Download link expired; start a new conversion",
+  "conversion.success.expiry":
+    "This result will be auto-deleted in {time}; please finish using it before then.",
+  "conversion.success.expiry.expired": "This conversion result has expired.",
+  "conversion.success.expiry.remaining.daysHours": "{days}d {hours}h",
+  "conversion.success.expiry.remaining.daysOnly": "{days}d",
+  "conversion.success.expiry.remaining.hoursMinutes": "{hours}h {minutes}m",
+  "conversion.success.expiry.remaining.hoursOnly": "{hours}h",
+  "conversion.success.expiry.remaining.minutes": "{minutes}m",
+  "conversion.success.startNew": "Start new conversion",
+
+  // failed
+  "conversion.failed.heading": "Conversion failed",
+  "conversion.failed.errorCode": "Error code",
+  "conversion.failed.suggestionsTitle": "Things you can try:",
+  "conversion.failed.retry": "Try again",
+  "conversion.failed.backToModels": "Back to models",
+  "conversion.failed.contactSupport":
+    "If this keeps happening, copy the job ID and contact support.",
+  "conversion.failed.copyJobId": "Copy job ID",
+  "conversion.failed.toastJobIdCopied": "Job ID copied.",
+  // F-T8 — FailedView
+  "conversion.failed.aria.alert": "Conversion failure notice",
+  "conversion.failed.jobIdLabel": "Job ID",
+  "conversion.failed.summary.failedSuffix": " (failed)",
+  "conversion.failed.aria.retry": "Reset and start a new conversion",
+
+  // error code translations (mirrors zh-Hant; one key per suggestion line)
+  "conversion.error.UNSUPPORTED_FORMAT.message":
+    "This model format isn't supported — please use ONNX / TFLite.",
+  "conversion.error.UNSUPPORTED_FORMAT.suggestion1": "Verify file extension.",
+  "conversion.error.UNSUPPORTED_FORMAT.suggestion2":
+    "Use a standard export tool.",
+  "conversion.error.INVALID_CHECKSUM.message":
+    "File was corrupted in transit — please re-upload.",
+  "conversion.error.INVALID_CHECKSUM.suggestion1": "Restart the upload.",
+  "conversion.error.QUANTIZATION_FAILED.message":
+    "Model contains unsupported operators and can't be quantized for the target chip.",
+  "conversion.error.QUANTIZATION_FAILED.suggestion1": "Simplify the model.",
+  "conversion.error.QUANTIZATION_FAILED.suggestion2": "Remove custom ops.",
+  "conversion.error.QUANTIZATION_FAILED.suggestion3":
+    "Use a smaller input shape.",
+  "conversion.error.MODEL_TOO_LARGE.message": "Model exceeds the 500 MB limit.",
+  "conversion.error.MODEL_TOO_LARGE.suggestion1": "Use a smaller model.",
+  "conversion.error.MODEL_TOO_LARGE.suggestion2":
+    "Try pruning / quantization first.",
+  "conversion.error.QUOTA_EXCEEDED.message":
+    "System is busy right now — please try again later.",
+  "conversion.error.QUOTA_EXCEEDED.suggestion1": "Wait 5 minutes and retry.",
+  "conversion.error.unknown.message":
+    "Conversion failed. If it keeps happening, contact support.",
+  "conversion.error.unknown.suggestion1":
+    "Copy the job ID and report it to support.",
+
+  // expired / not-found
+  "conversion.expired.heading": "This conversion result has expired",
+  "conversion.expired.description":
+    "Conversion results are kept for 7 days; this one has been auto-cleared.",
+  // F-T9 sub-1: ExpiredView extra description — explain how to recover
+  "conversion.expired.subDescription":
+    "To get a new conversion result, please submit the model again.",
+  // F-T9 sub-1: ExpiredView a11y
+  "conversion.expired.aria.alert": "Conversion result has expired notice",
+  "conversion.expired.aria.startNew": "Reset and start a new conversion",
+  "conversion.expired.startNew": "Start new conversion",
+
+  // mobile hint
+  "conversion.mobileHint":
+    "Uploading large models on mobile can be unreliable; we recommend a desktop browser.",
+
   // ── Clusters (F7 stub) ──
   "clusters.title": "Clusters",
   "clusters.subtitle":
diff --git a/visionA-frontend/src/lib/i18n/dictionaries/zh-Hant.ts b/visionA-frontend/src/lib/i18n/dictionaries/zh-Hant.ts
index c920f57..9c42e31 100644
--- a/visionA-frontend/src/lib/i18n/dictionaries/zh-Hant.ts
+++ b/visionA-frontend/src/lib/i18n/dictionaries/zh-Hant.ts
@@ -35,6 +35,7 @@ export const zhHant: Dictionary = {
   "nav.dashboard": "儀表板",
   "nav.devices": "裝置",
   "nav.models": "模型",
+  "nav.conversion": "轉檔",
   "nav.workspace": "推論工作區",
   "nav.clusters": "叢集",
   "nav.settings": "設定",
@@ -325,6 +326,268 @@ export const zhHant: Dictionary = {
   "account.danger.deleteAccount.tooltip":
     "請至 Innovedus 帳號中心處理。",
 
+  // ── Conversion / 轉檔（Phase 0.8 — feature-converter-integration）──
+  // 設計來源：.autoflow/03-design/wireframes/wireframe-conversion.md §11
+  // 對應 PRD：.autoflow/02-prd/features/feature-converter-integration.md
+  // 範圍：5 個 state（idle / uploading / processing / success / failed）+ 6 種錯誤碼翻譯 + 過期狀態
+  "conversion.title": "轉檔",
+  "conversion.subtitle":
+    "把 ONNX / TFLite 模型轉成 .nef，跑在 Kneron 邊緣裝置上",
+
+  // idle 空狀態
+  "conversion.idle.heading": "還沒有進行中的轉檔",
+  "conversion.idle.description":
+    "上傳一個 ONNX / TFLite 模型，選擇目標 Kneron 晶片，我們幫你產出可直接燒錄的 .nef 檔案",
+  "conversion.idle.cta": "開始轉檔",
+  "conversion.idle.formats": "支援 .onnx / .tflite · 最大 500 MB",
+  "conversion.idle.about.title": "關於轉檔",
+  "conversion.idle.about.line1": "一次只能跑一個轉檔任務（包含其他分頁）",
+  "conversion.idle.about.line2": "完成後 7 天內可下載結果，過期自動清除",
+  "conversion.idle.about.line3": "轉檔約耗時 1–10 分鐘，依模型大小而定",
+
+  // Upload Dialog
+  "conversion.upload.title": "開始轉檔",
+  "conversion.upload.description":
+    "上傳模型、選擇目標晶片，可選擇加上 reference images 提升精度",
+  "conversion.upload.source.label": "來源模型",
+  "conversion.upload.source.dropzone": "拖曳 .onnx / .tflite 到此處",
+  "conversion.upload.source.or": "或",
+  "conversion.upload.source.browse": "選擇檔案",
+  "conversion.upload.source.formatHint":
+    "支援格式：.onnx · .tflite · 最大 500 MB",
+  "conversion.upload.source.remove": "移除",
+  "conversion.upload.name.label": "任務名稱（選填）",
+  "conversion.upload.name.hint": "顯示用，不影響輸出檔名",
+  "conversion.upload.chip.label": "目標晶片",
+  "conversion.upload.refImages.label": "Reference images（選填）",
+  "conversion.upload.refImages.dropzone": "拖曳圖片到此處（選填）",
+  "conversion.upload.refImages.hint":
+    "加上 ref images 可提升量化後精度（最多 100 張，每張 ≤ 10 MB）",
+  "conversion.upload.refImages.summary":
+    "已選 {count} 張 ref images（共 {totalSize}）",
+  "conversion.upload.refImages.removeAll": "移除全部",
+  "conversion.upload.cancel": "取消",
+  "conversion.upload.start": "開始轉檔",
+  "conversion.upload.error.noFile": "請選擇 .onnx 或 .tflite 檔案",
+  "conversion.upload.error.unsupported":
+    "不支援的格式，請改用 ONNX 或 TFLite",
+  "conversion.upload.error.modelTooLarge":
+    "模型超過 500 MB 上限，請改用較小的模型",
+  "conversion.upload.error.noChip": "請選擇目標晶片",
+  "conversion.upload.error.refTooLarge":
+    "{filename} 超過 10 MB，請移除或壓縮後再試",
+  "conversion.upload.error.refTooMany": "Reference images 上限 100 張",
+
+  // uploading 階段（Dialog 內）
+  "conversion.uploading.title": "上傳中",
+  "conversion.uploading.heading": "正在上傳到 visionA…",
+  "conversion.uploading.progress": "已上傳 {loaded} / {total} · 預估剩餘 {eta}",
+  "conversion.uploading.almostDone": "即將完成…",
+  "conversion.uploading.warning": "請勿關閉此分頁，否則上傳會中斷",
+  "conversion.uploading.cancel": "取消上傳",
+  "conversion.uploading.cancelConfirm": "上傳尚未完成，確定取消？",
+  "conversion.uploading.tabTitle": "visionA Cloud · 上傳中 ({pct}%)",
+  "conversion.uploading.toastCanceled": "已取消上傳",
+  "conversion.uploading.toastFailed": "上傳失敗：{reason}",
+  "conversion.uploading.toastStarted": "已開始轉檔（任務 #{shortJobId}）",
+  // F-T9 sub-3 / M1：上傳失敗 toast hint
+  // M1 修補：File 物件不能保留在 store（不可序列化、跨 unmount 不安全），
+  // 失敗回 idle 後 chip / taskName 透過 store.formDraft 保留，但檔案需重選
+  "conversion.toast.retryHint": "您之前的設定（晶片 / 任務名稱）仍保留，請重新選擇檔案再試",
+  "conversion.toast.networkError": "網路錯誤，請檢查連線後重試",
+  // F-T5：ETA / 取消確認 / beforeunload（細節 keys）
+  "conversion.uploading.subtitle": "正在上傳模型到 visionA backend",
+  "conversion.uploading.eta.computing": "預估剩餘時間…",
+  "conversion.uploading.eta.almostDone": "即將完成…",
+  "conversion.uploading.eta.format": "預估剩餘 {eta}",
+  "conversion.uploading.progress.format": "{loaded} / {total}",
+  "conversion.uploading.info": "上傳完成後將開始轉檔（10–30 秒不等）",
+  "conversion.uploading.cancel.confirm.title": "取消轉檔？",
+  "conversion.uploading.cancel.confirm.message":
+    "上傳尚未完成，已上傳的進度會丟失。確定要取消嗎？",
+  "conversion.uploading.cancel.confirm.yes": "確定取消",
+  "conversion.uploading.cancel.confirm.no": "繼續上傳",
+  "conversion.uploading.warning.beforeunload":
+    "上傳尚未完成，離開將中斷上傳。",
+  "conversion.uploading.target": "目標晶片：{chip}",
+  "conversion.uploading.aria.cancel": "取消上傳",
+  "conversion.uploading.aria.progress": "上傳進度",
+  "conversion.uploading.aria.status": "已上傳 {pct}%，{eta}",
+
+  // processing 階段（轉檔進行中）
+  "conversion.processing.title": "轉檔",
+  "conversion.processing.cardHeading": "進行中",
+  "conversion.processing.statusBadge": "轉檔中",
+  "conversion.processing.startedAgo": "開始於 {time}",
+  "conversion.processing.stage1": "上傳完成",
+  "conversion.processing.stage2": "解析模型",
+  "conversion.processing.stage3": "編譯 NEF",
+  "conversion.processing.processing": "處理中…",
+  "conversion.processing.hint":
+    "通常需要 1–10 分鐘 · 你可以離開此頁面，回來時會自動更新進度",
+  "conversion.processing.background.title": "你可以放著不管",
+  "conversion.processing.background.l1":
+    "我們會在背景持續查詢進度（每 5–10 秒一次）",
+  "conversion.processing.background.l2": "完成後分頁標題會通知你",
+  "conversion.processing.background.l3":
+    "此頁面關掉也沒關係，回來時會自動恢復",
+  "conversion.processing.queueLong":
+    "目前排隊較久，你可以離開此頁稍後再回",
+  "conversion.processing.runLong": "轉檔耗時較長，仍在進行中",
+  "conversion.processing.pollFailed": "無法取得轉檔狀態，請重試",
+  "conversion.processing.bannerActive": "您離開前的轉檔仍在進行中",
+  "conversion.processing.bannerExisting":
+    "您已有一個轉檔正在進行中，已切換至該任務",
+  // F-T9 sub-2：banner dismiss 按鈕的 a11y label
+  "conversion.processing.bannerDismiss": "關閉提示",
+
+  // F-T6：ProcessingView（queued / running 共用 UI）
+  // 任務描述對應 converter `stage` enum（onnx / bie / nef）— 與既有 stage1/2/3
+  // （上傳完成 / 解析模型 / 編譯 NEF）的「使用者感知」三段不同；ProcessingView
+  // 採用 onnx / bie / nef 對應 converter 真實 stage。詳見任務說明 §wireframe §3.3。
+  "conversion.processing.subtitle": "正在轉檔，請保持頁面開啟",
+  "conversion.processing.queued": "排隊中⋯",
+  "conversion.processing.stage.onnx": "解析模型",
+  "conversion.processing.stage.bie": "量化編譯",
+  "conversion.processing.stage.nef": "編譯 NEF",
+  "conversion.processing.stage.status.completed": "完成",
+  "conversion.processing.stage.status.current": "進行中",
+  "conversion.processing.stage.status.pending": "待處理",
+  "conversion.processing.stage.aria.completed": "{name}（已完成）",
+  "conversion.processing.stage.aria.current": "{name}（進行中）",
+  "conversion.processing.stage.aria.pending": "{name}（待處理）",
+  "conversion.processing.eta.pending": "請耐心等候",
+  "conversion.processing.eta.computing": "剩餘時間估算中",
+  "conversion.processing.expiryHint":
+    "7 天後將自動清除任務，請完成下載或加到模型庫",
+  "conversion.processing.tabTitle.prefix": "(轉檔中) ",
+  "conversion.processing.aria.progressIndeterminate":
+    "轉檔進行中，剩餘時間未知",
+  "conversion.processing.aria.queueProgress": "排隊中，等待轉檔開始",
+  "conversion.processing.targetChipPrefix": "→",
+
+  // 已有 active job 提示（idle 頁也會用到）
+  "conversion.busy.title": "您已有一個轉檔正在進行中",
+  "conversion.busy.cta": "查看進度",
+
+  // success 結果
+  "conversion.success.heading": "轉檔完成",
+  "conversion.success.summary.chip": "目標晶片",
+  "conversion.success.summary.size": "輸出大小",
+  "conversion.success.summary.duration": "耗時",
+  "conversion.success.summary.checksum": "checksum",
+  "conversion.success.summary.jobId": "任務",
+  "conversion.success.nextStep": "接下來要做什麼？",
+  "conversion.success.import.title": "加到模型庫",
+  "conversion.success.import.description":
+    "之後可以從模型庫部署到任何 {chip} 裝置",
+  "conversion.success.import.cta": "加到模型庫",
+  "conversion.success.import.dialog.title": "加到模型庫",
+  "conversion.success.import.dialog.description":
+    "把這個轉檔結果加到模型庫，之後可以直接部署到 {chip} 裝置",
+  "conversion.success.import.dialog.nameLabel": "模型名稱",
+  "conversion.success.import.dialog.nameHint":
+    "顯示在模型庫中的名稱，最多 100 字元；不可包含 / 或 \\",
+  "conversion.success.import.dialog.nameError.required": "請輸入模型名稱",
+  "conversion.success.import.dialog.nameError.tooLong":
+    "模型名稱不可超過 100 字元",
+  "conversion.success.import.dialog.nameError.invalidChars":
+    "模型名稱不可包含 / 或 \\",
+  "conversion.success.import.dialog.descLabel": "描述（選填）",
+  "conversion.success.import.dialog.sourceLabel": "來源",
+  "conversion.success.import.dialog.sourceValue": "轉檔（job #{shortJobId}）",
+  "conversion.success.import.dialog.confirm": "加到模型庫",
+  "conversion.success.import.dialog.cancel": "取消",
+  "conversion.success.import.processing": "處理中…",
+  "conversion.success.import.toastDone": "已加入模型庫",
+  "conversion.success.import.toastDoneAction": "前往模型庫 →",
+  "conversion.success.import.toastDup": "此任務已加入過模型庫",
+  "conversion.success.import.toastDupAction": "查看現有模型 →",
+  "conversion.success.import.statusDone": "✓ 已加入（前往查看 →）",
+  "conversion.success.import.errorGeneric":
+    "加到模型庫失敗，請稍後再試",
+  "conversion.success.import.aria.cta":
+    "加到模型庫（會開啟確認對話框）",
+  "conversion.success.download.title": "下載 .nef",
+  "conversion.success.description":
+    "{source} 已成功轉成 {chip} 可用的 .nef 檔",
+  "conversion.success.summary.outputFile": "輸出檔案",
+  "conversion.success.summary.notAvailable": "—",
+  "conversion.success.download.description": "存到本機自行使用",
+  "conversion.success.download.cta": "下載",
+  "conversion.success.download.preparing": "準備下載…",
+  "conversion.success.download.toastStart": "下載已開始",
+  "conversion.success.download.toastHint":
+    "若沒看到下載提示，請檢查瀏覽器設定",
+  "conversion.success.download.toastFail": "下載連結取得失敗",
+  "conversion.success.download.aria.cta": "下載 .nef 檔到本機",
+  "conversion.success.download.aria.disabled":
+    "下載連結已過期，請開始新轉檔",
+  "conversion.success.expiry":
+    "此轉檔結果將在 {time} 後自動清除，請在期限內完成處理",
+  "conversion.success.expiry.expired": "此轉檔結果已過期",
+  "conversion.success.expiry.remaining.daysHours": "{days} 天 {hours} 小時",
+  "conversion.success.expiry.remaining.daysOnly": "{days} 天",
+  "conversion.success.expiry.remaining.hoursMinutes":
+    "{hours} 小時 {minutes} 分鐘",
+  "conversion.success.expiry.remaining.hoursOnly": "{hours} 小時",
+  "conversion.success.expiry.remaining.minutes": "{minutes} 分鐘",
+  "conversion.success.startNew": "開始新轉檔",
+
+  // failed 結果
+  "conversion.failed.heading": "轉檔失敗",
+  "conversion.failed.errorCode": "錯誤代碼",
+  "conversion.failed.suggestionsTitle": "你可以試試：",
+  "conversion.failed.retry": "重新開始",
+  "conversion.failed.backToModels": "回模型庫",
+  "conversion.failed.contactSupport":
+    "若持續發生，請複製任務 ID 聯絡支援團隊",
+  "conversion.failed.copyJobId": "複製任務 ID",
+  "conversion.failed.toastJobIdCopied": "已複製任務 ID",
+  // F-T8 新增 — FailedView 用
+  "conversion.failed.aria.alert": "轉檔失敗通知",
+  "conversion.failed.jobIdLabel": "Job ID",
+  "conversion.failed.summary.failedSuffix": "（失敗）",
+  "conversion.failed.aria.retry": "回到起點，重新開始一次轉檔",
+
+  // 錯誤碼翻譯（對應 PRD §F5 + .autoflow/04-architecture/conversion.md）
+  "conversion.error.UNSUPPORTED_FORMAT.message":
+    "此模型格式目前不支援，請改用 ONNX / TFLite",
+  "conversion.error.UNSUPPORTED_FORMAT.suggestion1": "確認檔案副檔名",
+  "conversion.error.UNSUPPORTED_FORMAT.suggestion2": "用標準 export 工具",
+  "conversion.error.INVALID_CHECKSUM.message":
+    "檔案傳輸過程毀損，請重新上傳",
+  "conversion.error.INVALID_CHECKSUM.suggestion1": "重新開始上傳",
+  "conversion.error.QUANTIZATION_FAILED.message":
+    "模型內含不支援的運算子，無法量化到目標晶片",
+  "conversion.error.QUANTIZATION_FAILED.suggestion1": "簡化模型結構",
+  "conversion.error.QUANTIZATION_FAILED.suggestion2": "移除 Custom Op",
+  "conversion.error.QUANTIZATION_FAILED.suggestion3": "改用較小的 input shape",
+  "conversion.error.MODEL_TOO_LARGE.message": "模型超過 500 MB 上限",
+  "conversion.error.MODEL_TOO_LARGE.suggestion1": "改用較小模型",
+  "conversion.error.MODEL_TOO_LARGE.suggestion2": "嘗試 Pruning / Quantization",
+  "conversion.error.QUOTA_EXCEEDED.message": "系統暫時繁忙，請稍後再試",
+  "conversion.error.QUOTA_EXCEEDED.suggestion1": "等 5 分鐘後重試",
+  "conversion.error.unknown.message":
+    "轉檔失敗，請稍後重試。若持續發生請聯絡支援團隊",
+  "conversion.error.unknown.suggestion1": "複製任務 ID 回報給支援團隊",
+
+  // 已過期 / 找不到
+  "conversion.expired.heading": "此轉檔結果已過期",
+  "conversion.expired.description":
+    "轉檔結果保留期為 7 天，目前已超過保留期限並自動清除。",
+  // F-T9 sub-1：ExpiredView 補充說明 — 解釋為什麼過期 + 怎麼處理
+  "conversion.expired.subDescription":
+    "如需重新取得轉檔結果，請按下方按鈕重新提交一次。",
+  // F-T9 sub-1：ExpiredView a11y
+  "conversion.expired.aria.alert": "轉檔結果已過期通知",
+  "conversion.expired.aria.startNew": "重新開始一次轉檔",
+  "conversion.expired.startNew": "重新轉檔",
+
+  // mobile hint（≥ 500 MB 檔在手機上傳體驗差）
+  "conversion.mobileHint":
+    "Mobile 設備上傳大型模型可能不穩定，建議使用桌面版瀏覽器",
+
   // ── Clusters（F7 新增 stub）──
   "clusters.title": "叢集",
   "clusters.subtitle": "把多台 Kneron 裝置組成平行推論叢集",
diff --git a/visionA-frontend/src/lib/utils/eta.test.ts b/visionA-frontend/src/lib/utils/eta.test.ts
new file mode 100644
index 0000000..ad28dc7
--- /dev/null
+++ b/visionA-frontend/src/lib/utils/eta.test.ts
@@ -0,0 +1,170 @@
+/**
+ * ETA 純函式單元測試（Phase 0.8 F-T5 — M1 補強）
+ *
+ * 對應 review M1：F-T5 review 指出 UploadingView.test.tsx 13 個測試裡 ETA 只測
+ * 「無資料」+「pct≥99.5%」兩個邊界，EWMA 演算法本身完全沒測。本檔把核心
+ * 演算法抽出為純函式測，覆蓋：
+ *   - smoothSpeed 第一次採用 instant、之後跑 EWMA 公式
+ *   - estimateRemainingSeconds 正常 / 邊界
+ *   - computeEtaUpdate：第一次 / 倒退 / dt<100ms / 正常 / EWMA 平滑
+ */
+
+import { describe, expect, it } from "vitest";
+
+import {
+  computeEtaUpdate,
+  estimateRemainingSeconds,
+  EWMA_ALPHA,
+  instantSpeedBytesPerSec,
+  smoothSpeed,
+  MIN_SAMPLE_INTERVAL_MS,
+} from "./eta";
+
+const MB = 1024 * 1024;
+
+describe("smoothSpeed — EWMA 平滑", () => {
+  it("第一次（prev=null）直接採 instant，不從 0 起算被拉低", () => {
+    expect(smoothSpeed(null, 10 * MB)).toBe(10 * MB);
+  });
+
+  it("EWMA 公式：instant 暴增（10→50 MB/s）→ next = 0.3*50 + 0.7*10 = 22 MB/s", () => {
+    const prev = 10 * MB;
+    const instant = 50 * MB;
+    const next = smoothSpeed(prev, instant);
+    // 0.3 * 50 + 0.7 * 10 = 15 + 7 = 22
+    expect(next).toBeCloseTo(EWMA_ALPHA * instant + (1 - EWMA_ALPHA) * prev, 6);
+    expect(next / MB).toBeCloseTo(22, 6);
+  });
+
+  it("instant 暴跌（50→10 MB/s）→ next = 0.3*10 + 0.7*50 = 38 MB/s", () => {
+    const next = smoothSpeed(50 * MB, 10 * MB);
+    expect(next / MB).toBeCloseTo(38, 6);
+  });
+
+  it("速度穩定 → smoothed 不變", () => {
+    expect(smoothSpeed(20 * MB, 20 * MB)).toBeCloseTo(20 * MB, 6);
+  });
+
+  it("自訂 alpha：alpha=1 → 完全採 instant；alpha=0 → 完全採 prev", () => {
+    expect(smoothSpeed(10, 50, 1)).toBe(50);
+    expect(smoothSpeed(10, 50, 0)).toBe(10);
+  });
+});
+
+describe("instantSpeedBytesPerSec", () => {
+  it("dBytes=10MB / dt=1000ms → 10 MB/s", () => {
+    expect(instantSpeedBytesPerSec(10 * MB, 1000) / MB).toBeCloseTo(10, 6);
+  });
+
+  it("dt<=0 → 0（防呆，避免除以 0）", () => {
+    expect(instantSpeedBytesPerSec(10 * MB, 0)).toBe(0);
+    expect(instantSpeedBytesPerSec(10 * MB, -50)).toBe(0);
+  });
+});
+
+describe("estimateRemainingSeconds", () => {
+  it("100MB total / 20MB loaded / 10 MB/s → ETA=8s", () => {
+    const eta = estimateRemainingSeconds(20 * MB, 100 * MB, 10 * MB);
+    expect(eta).toBeCloseTo(8, 6);
+  });
+
+  it("speed<=0 → null", () => {
+    expect(estimateRemainingSeconds(10, 100, 0)).toBeNull();
+    expect(estimateRemainingSeconds(10, 100, -1)).toBeNull();
+  });
+
+  it("total<=0 → null", () => {
+    expect(estimateRemainingSeconds(0, 0, 10)).toBeNull();
+    expect(estimateRemainingSeconds(0, -1, 10)).toBeNull();
+  });
+
+  it("loaded >= total → 0（已完成，不要回負數）", () => {
+    expect(estimateRemainingSeconds(100, 100, 10)).toBe(0);
+    expect(estimateRemainingSeconds(120, 100, 10)).toBe(0);
+  });
+});
+
+describe("computeEtaUpdate — progress 一次更新", () => {
+  it("第一次採樣（prevSample=null）→ updated=false、etaSeconds=null", () => {
+    const r = computeEtaUpdate(null, null, 1000, 10 * MB, 100 * MB);
+    expect(r.updated).toBe(false);
+    expect(r.etaSeconds).toBeNull();
+    expect(r.smoothedSpeed).toBeNull();
+    expect(r.resetSample).toBe(false);
+  });
+
+  it("ETA 正常計算：loaded 10MB→20MB / dt=1s / total=100MB → speed=10MB/s, ETA=8s", () => {
+    const prevSample = { at: 1000, loaded: 10 * MB };
+    const r = computeEtaUpdate(prevSample, null, 2000, 20 * MB, 100 * MB);
+    expect(r.updated).toBe(true);
+    // 第一次 EWMA：prevSpeed=null → smoothed=instant=10MB/s
+    expect(r.smoothedSpeed! / MB).toBeCloseTo(10, 6);
+    expect(r.etaSeconds).toBeCloseTo(8, 6);
+    expect(r.resetSample).toBe(false);
+  });
+
+  it("EWMA 平滑：instant 暴增不會讓 ETA 跳到瞬時值", () => {
+    // 已平滑速度 = 10 MB/s；本次 dt=1s, 收到 50 MB → instant=50MB/s
+    const prevSample = { at: 1000, loaded: 50 * MB };
+    const prevSpeed = 10 * MB;
+    const r = computeEtaUpdate(prevSample, prevSpeed, 2000, 100 * MB, 200 * MB);
+    expect(r.updated).toBe(true);
+    // newSpeed = 0.3*50 + 0.7*10 = 22 MB/s（不是 50）
+    expect(r.smoothedSpeed! / MB).toBeCloseTo(22, 6);
+    // ETA = (200-100)/22 ≈ 4.545s（不是 (200-100)/50 = 2s）
+    expect(r.etaSeconds).toBeCloseTo(100 / 22, 4);
+  });
+
+  it("loaded 倒退 → resetSample=true、smoothedSpeed 重置為 null", () => {
+    const prevSample = { at: 1000, loaded: 50 * MB };
+    const r = computeEtaUpdate(prevSample, 20 * MB, 2000, 10 * MB, 100 * MB);
+    expect(r.updated).toBe(false);
+    expect(r.resetSample).toBe(true);
+    expect(r.smoothedSpeed).toBeNull();
+    expect(r.etaSeconds).toBeNull();
+  });
+
+  it(`dt < ${MIN_SAMPLE_INTERVAL_MS}ms → 跳過採樣（updated=false、smoothedSpeed 維持 prev）`, () => {
+    const prevSample = { at: 1000, loaded: 10 * MB };
+    const prevSpeed = 5 * MB;
+    // dt = 50ms < 100ms
+    const r = computeEtaUpdate(prevSample, prevSpeed, 1050, 11 * MB, 100 * MB);
+    expect(r.updated).toBe(false);
+    expect(r.smoothedSpeed).toBe(prevSpeed); // 不動
+    expect(r.etaSeconds).toBeNull();
+    expect(r.resetSample).toBe(false);
+  });
+
+  it(`dt 剛好 ${MIN_SAMPLE_INTERVAL_MS}ms → 採樣（邊界）`, () => {
+    const prevSample = { at: 1000, loaded: 10 * MB };
+    const r = computeEtaUpdate(
+      prevSample,
+      null,
+      1000 + MIN_SAMPLE_INTERVAL_MS,
+      11 * MB,
+      100 * MB,
+    );
+    expect(r.updated).toBe(true);
+  });
+
+  it("初始 sample 採用 instant（不是 0 * 0.7 + instant * 0.3）", () => {
+    // prevSpeed=null（第一次平滑），確認 smoothSpeed 直接採 instant
+    const prevSample = { at: 0, loaded: 0 };
+    const r = computeEtaUpdate(prevSample, null, 1000, 5 * MB, 100 * MB);
+    expect(r.updated).toBe(true);
+    // dt=1000ms, dBytes=5MB → instant=5MB/s；smoothed=null→直接 5MB/s（不是 1.5MB/s）
+    expect(r.smoothedSpeed! / MB).toBeCloseTo(5, 6);
+    // ETA = (100-5)/5 = 19s
+    expect(r.etaSeconds).toBeCloseTo(19, 6);
+  });
+
+  it("ETA < 5s 邊界：構造 loaded/total/speed 讓 eta=3 秒", () => {
+    // total=100MB, loaded=70MB, speed=10MB/s → ETA=3s
+    // 用 computeEtaUpdate 驗 ETA 算出 3 秒（UI 端再判 < 5s 顯示「即將完成」）
+    const prevSample = { at: 0, loaded: 60 * MB };
+    const r = computeEtaUpdate(prevSample, null, 1000, 70 * MB, 100 * MB);
+    expect(r.updated).toBe(true);
+    expect(r.smoothedSpeed! / MB).toBeCloseTo(10, 6);
+    expect(r.etaSeconds).toBeCloseTo(3, 6);
+  });
+});
diff --git a/visionA-frontend/src/lib/utils/eta.ts b/visionA-frontend/src/lib/utils/eta.ts
new file mode 100644
index 0000000..7ec95c6
--- /dev/null
+++ b/visionA-frontend/src/lib/utils/eta.ts
@@ -0,0 +1,156 @@
+/**
+ * ETA 工具：EWMA 平滑速度 + 剩餘秒數
+ *
+ * Phase 0.8 conversion (見 `.autoflow/05-implementation/phase-0.8-F-T5.md`)
+ *
+ * 拆出純函式（從 UploadingView 內 useEta hook）的理由：
+ *   - 可獨立、確定性測試（不依賴 React render lifecycle、performance.now、useRef）
+ *   - 邏輯與顯示解耦：UploadingView 只負責記 lastSample（in ref）、呼叫純函式
+ *
+ * 對齊：
+ *   - wireframe-conversion.md §3.2（uploading state 視覺）
+ *   - architecture/conversion.md §4.3.1（XHR onprogress 是 browser→backend，不是端到端）
+ */
+
+/** EWMA 平滑因子（0–1）：越大越敏感、越小越平滑 */
+export const EWMA_ALPHA = 0.3;
+
+/** ETA < 此秒數 → UI 顯示「即將完成」，避免最後幾秒抖動 */
+export const ALMOST_DONE_THRESHOLD_SEC = 5;
+
+/** 兩次 sample 間隔太短就跳過（避免 0 秒除法 + 高頻 onprogress 噪音） */
+export const MIN_SAMPLE_INTERVAL_MS = 100;
+
+/**
+ * 用 EWMA 平滑速度。
+ *
+ * - prev === null → 第一次 sample，直接採 instant（不要從 0 起算被拉低）
+ * - 否則 → alpha * instant + (1 - alpha) * prev
+ *
+ * @param prev      上次平滑後速度（bytes/sec），null = 第一次
+ * @param instant   本次瞬時速度（bytes/sec）
+ * @param alpha     EWMA alpha（0–1），預設 0.3
+ */
+export function smoothSpeed(
+  prev: number | null,
+  instant: number,
+  alpha: number = EWMA_ALPHA,
+): number {
+  if (prev === null) return instant;
+  return alpha * instant + (1 - alpha) * prev;
+}
+
+/**
+ * 根據已上傳 / 總量 / 平滑速度算剩餘秒數。
+ *
+ * @returns 剩餘秒數；無法估算（speed<=0 / total<=0 / 已超過）回傳 null
+ */
+export function estimateRemainingSeconds(
+  loaded: number,
+  total: number,
+  smoothedSpeed: number,
+): number | null {
+  if (smoothedSpeed <= 0) return null;
+  if (total <= 0) return null;
+  const remaining = total - loaded;
+  if (remaining <= 0) return 0;
+  return remaining / smoothedSpeed;
+}
+
+/**
+ * 計算瞬時速度（bytes/sec）。
+ *
+ * @param dBytes  本次間隔內新增 bytes
+ * @param dtMs    本次間隔（ms）
+ * @returns       瞬時速度（bytes/sec）；dtMs<=0 回傳 0
+ */
+export function instantSpeedBytesPerSec(dBytes: number, dtMs: number): number {
+  if (dtMs <= 0) return 0;
+  return (dBytes / dtMs) * 1000;
+}
+
+/** 一次 progress sample 的描述 */
+export interface ProgressSample {
+  /** 時間戳（performance.now() 或 Date.now()） */
+  at: number;
+  /** 已上傳 bytes */
+  loaded: number;
+}
+
+export interface EtaCalcResult {
+  /** 是否更新了 EWMA state（false 代表 sample 太密 / 第一次 / 倒退；caller 仍要更新 lastSample） */
+  updated: boolean;
+  /** 新的平滑速度（bytes/sec），未更新時為 prevSpeed */
+  smoothedSpeed: number | null;
+  /** 新 ETA 秒數，未更新時為 null */
+  etaSeconds: number | null;
+  /** caller 是否該重置 lastSample（loaded 倒退時 = true） */
+  resetSample: boolean;
+}
+
+/**
+ * 一次 progress 的 EWMA 更新（純函式版本）。
+ *
+ * 行為：
+ *   - prevSample === null（第一次）→ updated=false，caller 要把當下存進 lastSample
+ *   - loaded 倒退（不該發生，但保險）→ resetSample=true，平滑速度歸 null
+ *   - dt < MIN_SAMPLE_INTERVAL_MS → updated=false（跳過避免噪音）
+ *   - 其他 → 計算 instant、跑 EWMA、算 ETA
+ *
+ * 此函式**不**寫 ref / state — caller 拿 result 自己決定要不要更新。
+ *
+ * @param prevSample  上次 sample（null = 第一次）
+ * @param prevSpeed   上次平滑速度（null = 還沒平滑過）
+ * @param now         本次時間戳（ms）
+ * @param loaded      本次 loaded bytes
+ * @param total       總 bytes
+ */
+export function computeEtaUpdate(
+  prevSample: ProgressSample | null,
+  prevSpeed: number | null,
+  now: number,
+  loaded: number,
+  total: number,
+): EtaCalcResult {
+  // 第一次 sample — 不算速度，caller 應記下 lastSample
+  if (prevSample === null) {
+    return {
+      updated: false,
+      smoothedSpeed: prevSpeed,
+      etaSeconds: null,
+      resetSample: false,
+    };
+  }
+
+  // 倒退（不該發生）→ 重置
+  if (loaded < prevSample.loaded) {
+    return {
+      updated: false,
+      smoothedSpeed: null,
+      etaSeconds: null,
+      resetSample: true,
+    };
+  }
+
+  const dtMs = now - prevSample.at;
+  if (dtMs < MIN_SAMPLE_INTERVAL_MS) {
+    return {
+      updated: false,
+      smoothedSpeed: prevSpeed,
+      etaSeconds: null,
+      resetSample: false,
+    };
+  }
+
+  const dBytes = loaded - prevSample.loaded;
+  const instant = instantSpeedBytesPerSec(dBytes, dtMs);
+  const nextSmoothed = smoothSpeed(prevSpeed, instant);
+  const eta = estimateRemainingSeconds(loaded, total, nextSmoothed);
+
+  return {
+    updated: true,
+    smoothedSpeed: nextSmoothed,
+    etaSeconds: eta,
+    resetSample: false,
+  };
+}
diff --git a/visionA-frontend/src/stores/conversion-store.test.ts b/visionA-frontend/src/stores/conversion-store.test.ts
new file mode 100644
index 0000000..3c0e663
--- /dev/null
+++ b/visionA-frontend/src/stores/conversion-store.test.ts
@@ -0,0 +1,881 @@
+/**
+ * Conversion Store 單元測試（Phase 0.8 F-T3）
+ *
+ * 對齊：
+ *   - flow-conversion.md §4 state machine + §5.4 polling 策略
+ *   - api-conversion.md §2 / §3 / §5
+ *
+ * 覆蓋：
+ *   - bootstrap 沒 active job → idle
+ *   - bootstrap 有 active job(running) → 開始 polling
+ *   - bootstrap 有 active job 且已過期 → expired
+ *   - startConversion happy path
+ *   - startConversion 409 → 自動 bootstrap
+ *   - startConversion onUploadProgress 觸發 uploadProgress state
+ *   - startConversion 上傳失敗（其他錯誤）→ 回 idle + error
+ *   - polling 收 succeeded → stopPolling + state succeeded
+ *   - polling 收 failed → state failed + error
+ *   - polling 收 5xx → 指數退避 + pollErrorCount 累計
+ *   - polling 5 次失敗 → pollVisibleError = true
+ *   - visibilitychange 隱藏 → 暫停；顯示 → 立刻 poll
+ *   - promoteToModels happy
+ *   - promoteToModels 409 → throw 給上層
+ *   - cancelUpload → AbortController.abort + state idle
+ *   - reset → 清所有 state + 停 polling
+ *
+ * Mock 策略：
+ *   - lib/api/conversion 的 5 個函式直接 vi.mock
+ *   - vi.useFakeTimers() 控制 setTimeout（polling delay）
+ *   - document.hidden / visibilityState 透過 Object.defineProperty 覆寫（happy-dom / jsdom 都吃）
+ */
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+
+import { ConversionAPIError } from "@/lib/api/conversion";
+import * as conversionApi from "@/lib/api/conversion";
+import type { ConversionJob } from "@/types/conversion";
+
+import { useConversionStore } from "./conversion-store";
+
+/* -------------------------------------------------------------------------- */
+/* Mock lib/api/conversion                                                    */
+/* -------------------------------------------------------------------------- */
+
+vi.mock("@/lib/api/conversion", async () => {
+  // 保留 ConversionAPIError export
+  const actual = await vi.importActual<typeof import("@/lib/api/conversion")>(
+    "@/lib/api/conversion",
+  );
+  return {
+    ...actual,
+    getActiveConversion: vi.fn(),
+    initConversion: vi.fn(),
+    getConversion: vi.fn(),
+    promoteConversionToModels: vi.fn(),
+    getConversionDownloadURL: actual.getConversionDownloadURL,
+  };
+});
+
+const mockedApi = conversionApi as unknown as {
+  getActiveConversion: ReturnType<typeof vi.fn>;
+  initConversion: ReturnType<typeof vi.fn>;
+  getConversion: ReturnType<typeof vi.fn>;
+  promoteConversionToModels: ReturnType<typeof vi.fn>;
+};
+
+/* -------------------------------------------------------------------------- */
+/* Helpers                                                                    */
+/* -------------------------------------------------------------------------- */
+
+function makeJob(overrides: Partial<ConversionJob> = {}): ConversionJob {
+  return {
+    job_id: "j-1",
+    status: "running",
+    stage: "bie",
+    progress: 50,
+    source_filename: "yolov5s.onnx",
+    target_chip: "KL720",
+    created_at: "2026-04-30T12:00:00Z",
+    expires_at: "2026-05-07T12:00:00Z",
+    ...overrides,
+  };
+}
+
+/** 把 document.hidden / visibilityState 設為指定值，並 dispatch event */
+function setDocumentVisibility(visible: boolean): void {
+  Object.defineProperty(document, "hidden", {
+    configurable: true,
+    get: () => !visible,
+  });
+  Object.defineProperty(document, "visibilityState", {
+    configurable: true,
+    get: () => (visible ? "visible" : "hidden"),
+  });
+  document.dispatchEvent(new Event("visibilitychange"));
+}
+
+/** 清 store 回初始狀態 + 卸 polling listener（必做，否則跨測試 leak） */
+function resetStore(): void {
+  // reset() 會卸 visibility hook + 清 timer
+  useConversionStore.getState().reset();
+  // 確保 setDocumentVisibility 不會洩漏到下個測試
+  setDocumentVisibility(true);
+}
+
+beforeEach(() => {
+  vi.clearAllMocks();
+  resetStore();
+});
+
+afterEach(() => {
+  // 確保所有 fake timer / listener 都清掉
+  vi.useRealTimers();
+  resetStore();
+});
+
+/* ========================================================================== */
+/* bootstrap                                                                   */
+/* ========================================================================== */
+
+describe("bootstrap", () => {
+  it("沒 active job → state 維持 idle", async () => {
+    mockedApi.getActiveConversion.mockResolvedValue(null);
+
+    await useConversionStore.getState().bootstrap();
+
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("idle");
+    expect(s.job).toBeNull();
+    expect(s.isInitializing).toBe(false);
+    expect(s.error).toBeNull();
+  });
+
+  it("有 active job(running) → state running + 開始 polling", async () => {
+    vi.useFakeTimers();
+    const job = makeJob({ status: "running" });
+    mockedApi.getActiveConversion.mockResolvedValue(job);
+
+    await useConversionStore.getState().bootstrap();
+
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("running");
+    expect(s.job?.job_id).toBe("j-1");
+    // 排程的 timer 還沒觸發 → mockedApi.getConversion 還沒被叫
+    expect(mockedApi.getConversion).not.toHaveBeenCalled();
+    // 推進 5 秒（POLL_INTERVAL_RUNNING_MS）→ 應該打 GET /api/conversion/{id}
+    mockedApi.getConversion.mockResolvedValue(makeJob({ status: "running" }));
+    await vi.advanceTimersByTimeAsync(5_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledWith(
+      "j-1",
+      expect.any(AbortSignal),
+    );
+  });
+
+  it("有 active job 且已過期 → state expired，不 polling", async () => {
+    vi.useFakeTimers();
+    // expires_at 在過去
+    const expiredJob = makeJob({
+      status: "running",
+      expires_at: "2020-01-01T00:00:00Z",
+    });
+    mockedApi.getActiveConversion.mockResolvedValue(expiredJob);
+
+    await useConversionStore.getState().bootstrap();
+
+    expect(useConversionStore.getState().uiState).toBe("expired");
+    // 推進時間，確認沒有 polling
+    await vi.advanceTimersByTimeAsync(20_000);
+    expect(mockedApi.getConversion).not.toHaveBeenCalled();
+  });
+
+  it("有 active job(succeeded) → state succeeded，不 polling", async () => {
+    vi.useFakeTimers();
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "succeeded" }),
+    );
+
+    await useConversionStore.getState().bootstrap();
+
+    expect(useConversionStore.getState().uiState).toBe("succeeded");
+    await vi.advanceTimersByTimeAsync(20_000);
+    expect(mockedApi.getConversion).not.toHaveBeenCalled();
+  });
+
+  it("bootstrap 失敗 → state idle + error", async () => {
+    mockedApi.getActiveConversion.mockRejectedValue(
+      new ConversionAPIError(500, "internal_error", "boom"),
+    );
+
+    await useConversionStore.getState().bootstrap();
+
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("idle");
+    expect(s.isInitializing).toBe(false);
+    expect(s.error?.code).toBe("internal_error");
+  });
+});
+
+/* ========================================================================== */
+/* startConversion                                                             */
+/* ========================================================================== */
+
+describe("startConversion", () => {
+  it("happy path：state 經 uploading → running，開始 polling", async () => {
+    vi.useFakeTimers();
+    const file = new File(["x".repeat(100)], "model.onnx");
+    mockedApi.initConversion.mockResolvedValue(
+      makeJob({ status: "running" }),
+    );
+
+    const promise = useConversionStore.getState().startConversion({
+      file,
+      targetChip: "KL720",
+    });
+
+    // 上傳啟動瞬間應該切到 uploading
+    expect(useConversionStore.getState().uiState).toBe("uploading");
+    expect(useConversionStore.getState().uploadProgress).toEqual({
+      loaded: 0,
+      total: 100,
+    });
+
+    await promise;
+
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("running");
+    expect(s.job?.job_id).toBe("j-1");
+    expect(s.uploadProgress).toBeNull();
+
+    // 確認 initConversion 被正確呼叫
+    expect(mockedApi.initConversion).toHaveBeenCalledWith(
+      expect.objectContaining({
+        file,
+        targetChip: "KL720",
+        signal: expect.any(AbortSignal),
+        onUploadProgress: expect.any(Function),
+      }),
+    );
+  });
+
+  it("onUploadProgress 觸發 uploadProgress state 更新", async () => {
+    const file = new File(["x"], "model.onnx");
+    let captured: ((loaded: number, total: number) => void) | null = null;
+    mockedApi.initConversion.mockImplementation(async (args) => {
+      captured = args.onUploadProgress ?? null;
+      // 不立刻 resolve，讓我們有時間呼叫 progress
+      return new Promise((resolve) => {
+        setTimeout(() => resolve(makeJob({ status: "running" })), 0);
+      });
+    });
+
+    const promise = useConversionStore.getState().startConversion({
+      file,
+      targetChip: "KL520",
+    });
+
+    // 等 microtask flush，captured 應已就位
+    await Promise.resolve();
+    expect(captured).not.toBeNull();
+    captured!(50, 200);
+    expect(useConversionStore.getState().uploadProgress).toEqual({
+      loaded: 50,
+      total: 200,
+    });
+    captured!(150, 200);
+    expect(useConversionStore.getState().uploadProgress).toEqual({
+      loaded: 150,
+      total: 200,
+    });
+
+    await promise;
+  });
+
+  it("startConversion 收 409 active_job_exists → 自動 bootstrap + switchedFromActiveJob = true", async () => {
+    const file = new File(["x"], "m.onnx");
+    mockedApi.initConversion.mockRejectedValue(
+      new ConversionAPIError(
+        409,
+        "active_job_exists",
+        "你已有進行中任務",
+        "req-x",
+      ),
+    );
+    // bootstrap 會 fallback 找到既存 active job
+    const existingJob = makeJob({ job_id: "j-existing", status: "running" });
+    mockedApi.getActiveConversion.mockResolvedValue(existingJob);
+
+    await useConversionStore.getState().startConversion({
+      file,
+      targetChip: "KL720",
+    });
+
+    const s = useConversionStore.getState();
+    // bootstrap 把 state 切到 running、job 變既存的
+    expect(s.uiState).toBe("running");
+    expect(s.job?.job_id).toBe("j-existing");
+    // banner flag 應為 true（給 UI 顯示「已切換至該任務」）
+    expect(s.switchedFromActiveJob).toBe(true);
+    // 不寫 error（這不是錯誤，是業務狀態切換）
+    expect(s.error).toBeNull();
+    expect(mockedApi.getActiveConversion).toHaveBeenCalled();
+  });
+
+  it("startConversion 一般錯誤 → 回 idle + 寫 error", async () => {
+    const file = new File(["x"], "m.onnx");
+    mockedApi.initConversion.mockRejectedValue(
+      new ConversionAPIError(413, "payload_too_large", "too big"),
+    );
+
+    await useConversionStore.getState().startConversion({
+      file,
+      targetChip: "KL520",
+    });
+
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("idle");
+    expect(s.uploadProgress).toBeNull();
+    expect(s.error?.code).toBe("payload_too_large");
+    expect(s.error?.status).toBe(413);
+  });
+
+  it("startConversion 在非 idle 狀態被叫 → 不動", async () => {
+    // 先強制 state 進 running
+    useConversionStore.getState()._setState({
+      uiState: "running",
+      job: makeJob({ status: "running" }),
+    });
+    const file = new File(["x"], "m.onnx");
+
+    await useConversionStore.getState().startConversion({
+      file,
+      targetChip: "KL520",
+    });
+
+    expect(mockedApi.initConversion).not.toHaveBeenCalled();
+    // state 維持 running
+    expect(useConversionStore.getState().uiState).toBe("running");
+  });
+});
+
+/* ========================================================================== */
+/* polling                                                                     */
+/* ========================================================================== */
+
+describe("polling", () => {
+  it("收 succeeded → stopPolling + state succeeded", async () => {
+    vi.useFakeTimers();
+    // 先 bootstrap 進 running
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "running" }),
+    );
+    await useConversionStore.getState().bootstrap();
+
+    // 第一次 poll 回 succeeded
+    mockedApi.getConversion.mockResolvedValueOnce(
+      makeJob({ status: "succeeded" }),
+    );
+
+    // 推 5s 觸發 poll
+    await vi.advanceTimersByTimeAsync(5_000);
+
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("succeeded");
+    expect(s.job?.status).toBe("succeeded");
+
+    // 確認後續不再 polling（再推 30s）
+    mockedApi.getConversion.mockClear();
+    await vi.advanceTimersByTimeAsync(30_000);
+    expect(mockedApi.getConversion).not.toHaveBeenCalled();
+  });
+
+  it("收 failed → state failed + error 來自 job.error", async () => {
+    vi.useFakeTimers();
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "running" }),
+    );
+    await useConversionStore.getState().bootstrap();
+
+    mockedApi.getConversion.mockResolvedValueOnce(
+      makeJob({
+        status: "failed",
+        error: { code: "QUANTIZATION_FAILED", message: "op not supported" },
+      }),
+    );
+    await vi.advanceTimersByTimeAsync(5_000);
+
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("failed");
+    expect(s.error?.code).toBe("QUANTIZATION_FAILED");
+    expect(s.error?.message).toBe("op not supported");
+  });
+
+  it("收 queued → 維持 polling（10s 間隔）", async () => {
+    vi.useFakeTimers();
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "queued" }),
+    );
+    await useConversionStore.getState().bootstrap();
+
+    mockedApi.getConversion.mockResolvedValue(makeJob({ status: "queued" }));
+
+    // queued 用 10s 間隔，5s 不會觸發
+    await vi.advanceTimersByTimeAsync(5_000);
+    expect(mockedApi.getConversion).not.toHaveBeenCalled();
+
+    // 再 5s（總 10s）觸發第一次
+    await vi.advanceTimersByTimeAsync(5_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(1);
+
+    // 再 10s 觸發第二次
+    await vi.advanceTimersByTimeAsync(10_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(2);
+
+    // 維持 queued state
+    expect(useConversionStore.getState().uiState).toBe("queued");
+  });
+
+  it("polling 收到 expires_at < now → 切 expired", async () => {
+    vi.useFakeTimers();
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "running" }),
+    );
+    await useConversionStore.getState().bootstrap();
+
+    mockedApi.getConversion.mockResolvedValueOnce(
+      makeJob({ status: "running", expires_at: "2020-01-01T00:00:00Z" }),
+    );
+    await vi.advanceTimersByTimeAsync(5_000);
+
+    expect(useConversionStore.getState().uiState).toBe("expired");
+    // 不再 polling
+    mockedApi.getConversion.mockClear();
+    await vi.advanceTimersByTimeAsync(30_000);
+    expect(mockedApi.getConversion).not.toHaveBeenCalled();
+  });
+
+  it("polling 失敗 → 累計 pollErrorCount + 指數退避", async () => {
+    vi.useFakeTimers();
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "running" }),
+    );
+    await useConversionStore.getState().bootstrap();
+
+    // 全程都 reject
+    mockedApi.getConversion.mockRejectedValue(
+      new ConversionAPIError(500, "internal_error", "boom"),
+    );
+
+    // 第一次：5s 後觸發
+    await vi.advanceTimersByTimeAsync(5_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(1);
+    expect(useConversionStore.getState().pollErrorCount).toBe(1);
+
+    // 第二次：失敗後排 10s（10 * 2^0），9s 內不該打
+    await vi.advanceTimersByTimeAsync(9_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(1);
+    // 推到 10.5s 觸發第二次
+    await vi.advanceTimersByTimeAsync(1_500);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(2);
+    expect(useConversionStore.getState().pollErrorCount).toBe(2);
+
+    // 第三次：失敗後排 20s（10 * 2^1），15s 內不該打
+    await vi.advanceTimersByTimeAsync(15_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(2);
+    // 推到 21s 觸發第三次
+    await vi.advanceTimersByTimeAsync(6_000);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(3);
+    expect(useConversionStore.getState().pollErrorCount).toBe(3);
+  });
+
+  it("polling 連 5 次失敗 → pollVisibleError = true", async () => {
+    vi.useFakeTimers();
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "running" }),
+    );
+    await useConversionStore.getState().bootstrap();
+
+    mockedApi.getConversion.mockRejectedValue(
+      new ConversionAPIError(500, "internal_error", "boom"),
+    );
+
+    // 連續 5 次失敗：跳到時間軸末端（足夠涵蓋所有 backoff）
+    // 退避序列：5s (initial), 10s, 20s, 30s (cap), 30s（cap） — 共需 95s+
+    await vi.advanceTimersByTimeAsync(5_000); // 1st
+    await vi.advanceTimersByTimeAsync(10_000); // 2nd
+    await vi.advanceTimersByTimeAsync(20_000); // 3rd
+    await vi.advanceTimersByTimeAsync(30_000); // 4th
+    await vi.advanceTimersByTimeAsync(30_000); // 5th
+
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(5);
+    expect(useConversionStore.getState().pollErrorCount).toBe(5);
+    expect(useConversionStore.getState().pollVisibleError).toBe(true);
+  });
+});
+
+/* ========================================================================== */
+/* visibilitychange                                                            */
+/* ========================================================================== */
+
+describe("visibilitychange", () => {
+  it("tab 切走 → 暫停下次 poll；回來 → 立刻打一次", async () => {
+    vi.useFakeTimers();
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "running" }),
+    );
+    await useConversionStore.getState().bootstrap();
+
+    // 切到隱藏：scheduler.timerId 應被清掉
+    setDocumentVisibility(false);
+
+    // 推進時間，不會打
+    mockedApi.getConversion.mockResolvedValue(makeJob({ status: "running" }));
+    await vi.advanceTimersByTimeAsync(60_000);
+    expect(mockedApi.getConversion).not.toHaveBeenCalled();
+
+    // 切回可見：立刻打一次
+    setDocumentVisibility(true);
+    // pollOnce 是 async，需 microtask flush
+    await vi.advanceTimersByTimeAsync(0);
+    expect(mockedApi.getConversion).toHaveBeenCalledTimes(1);
+  });
+});
+
+/* ========================================================================== */
+/* promoteToModels                                                             */
+/* ========================================================================== */
+
+describe("promoteToModels", () => {
+  it("happy path → 回 model_id", async () => {
+    useConversionStore.getState()._setState({
+      uiState: "succeeded",
+      job: makeJob({ status: "succeeded" }),
+    });
+    mockedApi.promoteConversionToModels.mockResolvedValue({
+      model_id: "m-abc",
+    });
+
+    const result = await useConversionStore
+      .getState()
+      .promoteToModels("yolov5s_kl720");
+
+    expect(result.model_id).toBe("m-abc");
+    expect(mockedApi.promoteConversionToModels).toHaveBeenCalledWith(
+      "j-1",
+      { name: "yolov5s_kl720" },
+    );
+    // state 維持 succeeded
+    expect(useConversionStore.getState().uiState).toBe("succeeded");
+    expect(useConversionStore.getState().error).toBeNull();
+  });
+
+  it("沒給 name → 送空 body", async () => {
+    useConversionStore.getState()._setState({
+      uiState: "succeeded",
+      job: makeJob({ status: "succeeded" }),
+    });
+    mockedApi.promoteConversionToModels.mockResolvedValue({
+      model_id: "m-abc",
+    });
+
+    await useConversionStore.getState().promoteToModels();
+
+    expect(mockedApi.promoteConversionToModels).toHaveBeenCalledWith("j-1", {});
+  });
+
+  it("409 already imported → throw + 寫入 error", async () => {
+    useConversionStore.getState()._setState({
+      uiState: "succeeded",
+      job: makeJob({ status: "succeeded" }),
+    });
+    mockedApi.promoteConversionToModels.mockRejectedValue(
+      new ConversionAPIError(409, "already_imported", "已加入過模型庫"),
+    );
+
+    await expect(
+      useConversionStore.getState().promoteToModels("dup"),
+    ).rejects.toBeInstanceOf(ConversionAPIError);
+
+    expect(useConversionStore.getState().error?.code).toBe("already_imported");
+  });
+
+  it("沒 active job → throw validation_failed", async () => {
+    await expect(
+      useConversionStore.getState().promoteToModels("x"),
+    ).rejects.toMatchObject({ code: "validation_failed" });
+  });
+
+  it("非 succeeded state → throw job_not_completed", async () => {
+    useConversionStore.getState()._setState({
+      uiState: "running",
+      job: makeJob({ status: "running" }),
+    });
+    await expect(
+      useConversionStore.getState().promoteToModels("x"),
+    ).rejects.toMatchObject({ code: "job_not_completed" });
+  });
+});
+
+/* ========================================================================== */
+/* cancelUpload + reset                                                        */
+/* ========================================================================== */
+
+describe("cancelUpload", () => {
+  it("uploading 中呼叫 → state 回 idle + 上傳被 abort", async () => {
+    const file = new File(["x"], "m.onnx");
+    let initSignal: AbortSignal | null = null;
+    mockedApi.initConversion.mockImplementation(async (args) => {
+      initSignal = args.signal ?? null;
+      return new Promise((_, reject) => {
+        args.signal?.addEventListener("abort", () => {
+          reject(
+            new ConversionAPIError(0, "aborted", "Request aborted"),
+          );
+        });
+      });
+    });
+
+    const promise = useConversionStore.getState().startConversion({
+      file,
+      targetChip: "KL720",
+    });
+    // 微任務 flush，讓 initConversion 的 mock 被呼到
+    await Promise.resolve();
+    expect(useConversionStore.getState().uiState).toBe("uploading");
+
+    useConversionStore.getState().cancelUpload();
+    expect(useConversionStore.getState().uiState).toBe("idle");
+    expect(useConversionStore.getState().uploadProgress).toBeNull();
+
+    // initConversion 的 promise 應該被 abort 觸發 reject
+    await promise;
+    expect(initSignal).not.toBeNull();
+    expect(initSignal!.aborted).toBe(true);
+  });
+
+  it("非 uploading 狀態呼叫 cancelUpload → no-op", () => {
+    useConversionStore.getState()._setState({
+      uiState: "running",
+      job: makeJob({ status: "running" }),
+    });
+    useConversionStore.getState().cancelUpload();
+    expect(useConversionStore.getState().uiState).toBe("running");
+  });
+});
+
+describe("reset", () => {
+  it("清所有 state + 停 polling", async () => {
+    vi.useFakeTimers();
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "running" }),
+    );
+    await useConversionStore.getState().bootstrap();
+    expect(useConversionStore.getState().uiState).toBe("running");
+
+    useConversionStore.getState().reset();
+
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("idle");
+    expect(s.job).toBeNull();
+    expect(s.uploadProgress).toBeNull();
+    expect(s.error).toBeNull();
+    expect(s.pollErrorCount).toBe(0);
+    expect(s.pollVisibleError).toBe(false);
+    expect(s.switchedFromActiveJob).toBe(false);
+
+    // 不再 polling
+    mockedApi.getConversion.mockClear();
+    await vi.advanceTimersByTimeAsync(30_000);
+    expect(mockedApi.getConversion).not.toHaveBeenCalled();
+  });
+
+  it("reset 清掉 switchedFromActiveJob = false（user dismiss banner）", () => {
+    useConversionStore.getState()._setState({
+      uiState: "running",
+      job: makeJob({ status: "running" }),
+      switchedFromActiveJob: true,
+    });
+    expect(useConversionStore.getState().switchedFromActiveJob).toBe(true);
+
+    useConversionStore.getState().reset();
+
+    expect(useConversionStore.getState().switchedFromActiveJob).toBe(false);
+  });
+});
+
+/* ========================================================================== */
+/* switchedFromActiveJob — banner flag                                         */
+/* ========================================================================== */
+
+/* ========================================================================== */
+/* F-T9 M1：formDraft —— IdleForm metadata 提到 store                          */
+/* ========================================================================== */
+
+describe("formDraft (F-T9 M1)", () => {
+  it("初始值為 DEFAULT_FORM_DRAFT（chip=KL720、其他空）", () => {
+    const { formDraft } = useConversionStore.getState();
+    expect(formDraft).toEqual({
+      fileName: null,
+      fileSize: null,
+      refImagesNames: [],
+      targetChip: "KL720",
+      taskName: "",
+      taskNameTouched: false,
+    });
+  });
+
+  it("updateFormDraft 部分 patch：只覆蓋指定欄位、其他保留", () => {
+    useConversionStore
+      .getState()
+      .updateFormDraft({ taskName: "yolov5s", taskNameTouched: true });
+    let s = useConversionStore.getState().formDraft;
+    expect(s.taskName).toBe("yolov5s");
+    expect(s.taskNameTouched).toBe(true);
+    // 其他欄位保留
+    expect(s.targetChip).toBe("KL720");
+
+    useConversionStore.getState().updateFormDraft({ targetChip: "KL520" });
+    s = useConversionStore.getState().formDraft;
+    expect(s.targetChip).toBe("KL520");
+    // 不會清掉之前 patch 的值
+    expect(s.taskName).toBe("yolov5s");
+  });
+
+  it("clearFormDraft 直接回 DEFAULT_FORM_DRAFT", () => {
+    useConversionStore.getState().updateFormDraft({
+      fileName: "model.onnx",
+      fileSize: 1024,
+      taskName: "task-x",
+      taskNameTouched: true,
+      targetChip: "KL520",
+      refImagesNames: ["a.png"],
+    });
+    useConversionStore.getState().clearFormDraft();
+    expect(useConversionStore.getState().formDraft).toEqual({
+      fileName: null,
+      fileSize: null,
+      refImagesNames: [],
+      targetChip: "KL720",
+      taskName: "",
+      taskNameTouched: false,
+    });
+  });
+
+  it("startConversion 上傳成功後 → 自動清 formDraft（user 完成提交）", async () => {
+    vi.useFakeTimers();
+    const file = new File(["x"], "model.onnx");
+    mockedApi.initConversion.mockResolvedValue(makeJob({ status: "running" }));
+
+    useConversionStore.getState().updateFormDraft({
+      fileName: "model.onnx",
+      fileSize: 1024,
+      taskName: "task-x",
+    });
+
+    await useConversionStore
+      .getState()
+      .startConversion({ file, targetChip: "KL720" });
+
+    const { formDraft } = useConversionStore.getState();
+    expect(formDraft.fileName).toBeNull();
+    expect(formDraft.taskName).toBe("");
+  });
+
+  it("startConversion 上傳失敗 → formDraft 保留（讓 user 重試時看到上次設定）", async () => {
+    const file = new File(["x"], "m.onnx");
+    mockedApi.initConversion.mockRejectedValue(
+      new ConversionAPIError(500, "internal_error", "boom"),
+    );
+
+    useConversionStore.getState().updateFormDraft({
+      fileName: "m.onnx",
+      fileSize: 2048,
+      taskName: "my-task",
+      taskNameTouched: true,
+      targetChip: "KL520",
+    });
+
+    await useConversionStore
+      .getState()
+      .startConversion({ file, targetChip: "KL520" });
+
+    // 失敗後 state 切回 idle，但 formDraft 留著（user 看得到上次設定，重新選檔即可重試）
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("idle");
+    expect(s.error?.code).toBe("internal_error");
+    expect(s.formDraft.fileName).toBe("m.onnx");
+    expect(s.formDraft.taskName).toBe("my-task");
+    expect(s.formDraft.targetChip).toBe("KL520");
+    expect(s.formDraft.taskNameTouched).toBe(true);
+  });
+
+  it("reset() 把 formDraft 一併清回預設", () => {
+    useConversionStore.getState().updateFormDraft({
+      fileName: "m.onnx",
+      fileSize: 100,
+      taskName: "x",
+      taskNameTouched: true,
+      targetChip: "KL520",
+      refImagesNames: ["a.png", "b.png"],
+    });
+    useConversionStore.getState().reset();
+
+    expect(useConversionStore.getState().formDraft).toEqual({
+      fileName: null,
+      fileSize: null,
+      refImagesNames: [],
+      targetChip: "KL720",
+      taskName: "",
+      taskNameTouched: false,
+    });
+  });
+
+  it("cancelUpload 不清 formDraft（使用者主動取消可能想重新調整再送）", async () => {
+    const file = new File(["x"], "m.onnx");
+    mockedApi.initConversion.mockImplementation(async (args) => {
+      return new Promise((_, reject) => {
+        args.signal?.addEventListener("abort", () => {
+          reject(new ConversionAPIError(0, "aborted", "Request aborted"));
+        });
+      });
+    });
+
+    useConversionStore
+      .getState()
+      .updateFormDraft({ fileName: "m.onnx", fileSize: 100, taskName: "draft" });
+
+    const promise = useConversionStore
+      .getState()
+      .startConversion({ file, targetChip: "KL720" });
+    await Promise.resolve();
+    expect(useConversionStore.getState().uiState).toBe("uploading");
+
+    useConversionStore.getState().cancelUpload();
+    await promise;
+
+    // formDraft 保留（即便 startConversion 一開始會清，但因為失敗時也保留，這裡先驗證
+    // cancel 後 state 為 idle 且 draft 仍是 user 之前設的）
+    // 注意：startConversion 進入 uploading 時不會清 formDraft（清是在 success 路徑）；
+    // cancel 走 abort → catch 看到 aborted code → 維持 idle 行為，不動 formDraft。
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("idle");
+    expect(s.formDraft.fileName).toBe("m.onnx");
+    expect(s.formDraft.taskName).toBe("draft");
+  });
+});
+
+describe("switchedFromActiveJob", () => {
+  it("初始值為 false", () => {
+    expect(useConversionStore.getState().switchedFromActiveJob).toBe(false);
+  });
+
+  it("bootstrap 不主動清 switchedFromActiveJob（保留 caller 設定）", async () => {
+    // 模擬 startConversion 409 流程：caller 先設 true，再呼 bootstrap
+    useConversionStore.getState()._setState({ switchedFromActiveJob: true });
+    mockedApi.getActiveConversion.mockResolvedValue(
+      makeJob({ status: "running" }),
+    );
+
+    await useConversionStore.getState().bootstrap();
+
+    const s = useConversionStore.getState();
+    expect(s.uiState).toBe("running");
+    // bootstrap 不能把 caller 設好的 banner flag 清掉
+    expect(s.switchedFromActiveJob).toBe(true);
+  });
+
+  it("startConversion 從 idle 啟動會清掉殘留的 switchedFromActiveJob", async () => {
+    // 假設先前殘留 true
+    useConversionStore.getState()._setState({ switchedFromActiveJob: true });
+    const file = new File(["x"], "m.onnx");
+    mockedApi.initConversion.mockResolvedValue(
+      makeJob({ status: "running" }),
+    );
+
+    await useConversionStore.getState().startConversion({
+      file,
+      targetChip: "KL720",
+    });
+
+    // 新轉檔成功啟動 → flag 應已清
+    expect(useConversionStore.getState().switchedFromActiveJob).toBe(false);
+  });
+});
diff --git a/visionA-frontend/src/stores/conversion-store.ts b/visionA-frontend/src/stores/conversion-store.ts
new file mode 100644
index 0000000..f9ebcfe
--- /dev/null
+++ b/visionA-frontend/src/stores/conversion-store.ts
@@ -0,0 +1,754 @@
+/**
+ * Conversion Store — visionA Cloud（Phase 0.8 — F-T3）
+ *
+ * 對齊：
+ *   - `.autoflow/03-design/flows/flow-conversion.md`（state machine + polling 策略 + 邊界 6 種情境）
+ *   - `.autoflow/03-design/wireframes/wireframe-conversion.md`（5 個 state 視覺）
+ *   - `.autoflow/04-architecture/api/api-conversion.md` §2 / §3 / §5
+ *   - `visionA-frontend/src/lib/api/conversion.ts`（F-T2 client，5 個函式 + ConversionAPIError）
+ *
+ * 職責：
+ *   - 管理「轉檔頁面 + 任意分頁背景 polling」共用的單一 source of truth。
+ *   - 把 backend 給的 ConversionJob 翻譯成 UI 用的 ConversionUIState（state machine）。
+ *   - 自管 polling lifecycle（recursive setTimeout + visibilitychange + 5xx 退避）。
+ *   - 自管 upload AbortController（給「取消上傳」按鈕用）。
+ *
+ * 設計原則：
+ *   1. **不持久化 jobId**（flow-conversion.md §11 wireframe §1.2）—— 每次 boot 走
+ *      `getActiveConversion()` 從 backend 重抓 ownership，避免「換瀏覽器 / 多分頁 / 私密模式」壞掉。
+ *   2. **state machine 嚴格**（flow §4）—— 不允許跳階段（idle → succeeded 是非法的）。
+ *      polling 收到的 job.status → mapJobStatusToUI 算 next state，再走 setUIStateFromJob。
+ *   3. **polling 用 recursive setTimeout 不用 setInterval** —— 避免 overlapping request；
+ *      每次 fetch 完才排下一次（含失敗退避）。
+ *   4. **document.hidden 暫停** —— tab 切走暫停 polling，回來立刻打一次。
+ *      用 visibilitychange listener；store 自管 listener add/remove（boot/destroy）。
+ *   5. **錯誤 code 直接傳給 UI** —— UI 用 `conversion.error.<code>` 取 i18n（F-T1 已就位）。
+ */
+
+"use client";
+
+import { create } from "zustand";
+
+import {
+  ConversionAPIError,
+  getActiveConversion,
+  getConversion,
+  initConversion,
+  promoteConversionToModels,
+} from "@/lib/api/conversion";
+import type {
+  ConversionJob,
+  ConversionStatus,
+  TargetChip,
+} from "@/types/conversion";
+
+/* -------------------------------------------------------------------------- */
+/* Types                                                                      */
+/* -------------------------------------------------------------------------- */
+
+/** UI state machine 的合法狀態（flow-conversion.md §4） */
+export type ConversionUIState =
+  | "idle" // 還沒開始 / 上一個結束已 dismissed
+  | "uploading" // multipart upload 進行中
+  | "queued" // upload 完，converter 還沒開始（status=queued）
+  | "running" // converter 處理中
+  | "succeeded"
+  | "failed"
+  | "expired"; // 7 天後 GC
+
+/** 上傳進度（XHR onprogress） */
+export interface UploadProgress {
+  loaded: number;
+  total: number;
+}
+
+/**
+ * Idle 表單草稿（F-T9 M1 修補：form state 提到 store）
+ *
+ * 為什麼放 store：
+ *   page.tsx 在 idle / uploading 之間是條件 render（不是 display:none），所以 IdleForm 在
+ *   `idle → uploading → 失敗回 idle` 路徑中會 unmount → re-mount，原本掛在 IdleForm useState 的
+ *   form 內容會跟著新 instance 一起重置。把 metadata 提到 store 後，無論 IdleForm 重 mount
+ *   多少次都能恢復使用者前一次填過的設定。
+ *
+ * 為什麼不存 File 物件（File / refImages）：
+ *   - File 不可序列化、跨 unmount 拿到也是 stale reference（瀏覽器並不擔保檔案內容仍可讀）
+ *   - 存進 in-memory store 雖技術上可行，但會 leak File handle 到結束 session 才釋放
+ *   - 取捨後選方案 A（最務實）：metadata 進 store、File 留 local；上傳失敗回 idle 時 form
+ *     會顯示之前的 chip / taskName / 上次選的檔名（顯示用），但 file picker 仍 empty 需重選。
+ *     對應 toast 文案改為「您之前的設定（晶片 / 任務名稱）仍保留，請重新選擇檔案再試」。
+ */
+export interface ConversionFormDraft {
+  /** 上次選的模型檔名（僅顯示用；File 物件本身不存 store） */
+  fileName: string | null;
+  /** 上次選的模型大小 bytes（僅顯示用） */
+  fileSize: number | null;
+  /** 上次選的 ref images 檔名清單（僅顯示用；File 物件不存） */
+  refImagesNames: string[];
+  /** 目標晶片（idle 預設 KL720，使用者改了會記在這） */
+  targetChip: TargetChip;
+  /** 任務名稱草稿 */
+  taskName: string;
+  /** 任務名稱是否被使用者親手改過（決定下一次選檔要不要自動帶 file.name stem） */
+  taskNameTouched: boolean;
+}
+
+/** 暴露給 UI 的錯誤摘要（i18n key 用 `conversion.error.<code>`） */
+export interface ConversionStoreError {
+  /** 來自 ConversionAPIError.code（小寫 snake / api-conversion.md §6） */
+  code: string;
+  /** 給 debug 看的；UI 預設不顯示 */
+  message?: string;
+  /** 0 = network/abort/timeout */
+  status: number;
+  /** 相關聯的 backend request id（若有） */
+  requestId?: string;
+}
+
+/** Phase 0.8 polling 排程常數（flow-conversion.md §5.4 + api-conversion.md §2 polling 建議） */
+const POLL_INTERVAL_RUNNING_MS = 5_000;
+const POLL_INTERVAL_QUEUED_MS = 10_000;
+const POLL_BACKOFF_BASE_MS = 10_000;
+const POLL_BACKOFF_MAX_MS = 30_000;
+/** 連 N 次 polling 失敗後 UI 標記「無法取得狀態」（仍繼續排下一次，不放棄）。 */
+const POLL_GIVE_UP_VISIBLE_THRESHOLD = 5;
+
+/* -------------------------------------------------------------------------- */
+/* startConversion args                                                       */
+/* -------------------------------------------------------------------------- */
+
+export interface StartConversionArgs {
+  file: File;
+  refImages?: File[];
+  targetChip: TargetChip;
+  taskName?: string;
+}
+
+/* -------------------------------------------------------------------------- */
+/* Store state + actions                                                      */
+/* -------------------------------------------------------------------------- */
+
+export interface ConversionStoreState {
+  /** UI state machine 當前狀態 */
+  uiState: ConversionUIState;
+  /** 當前 job 完整資料；idle 時為 null */
+  job: ConversionJob | null;
+  /** uploading 狀態時的進度；其他狀態為 null */
+  uploadProgress: UploadProgress | null;
+  /** 最近一次錯誤（uploading 失敗 / promote 失敗 / polling 失敗）。reset / 下一次成功操作會清空 */
+  error: ConversionStoreError | null;
+  /** boot 時 GET /active 進行中（避免初始閃爍） */
+  isInitializing: boolean;
+  /** 連續 polling 失敗計數（顯示「無法取得狀態」judging） */
+  pollErrorCount: number;
+  /** 是否曾顯示過 polling 失敗的提示（reset 時清） */
+  pollVisibleError: boolean;
+  /**
+   * startConversion 收到 409 active_job_exists 後自動 bootstrap 切到既存 job 時為 true。
+   *
+   * 用途：UI 顯示 banner「您已有一個轉檔正在進行中，已切換至該任務」（i18n key
+   * `conversion.processing.bannerExisting`，flow §6.1）。
+   *
+   * 設計（對齊 Reviewer 建議）：用獨立 flag 表達語義，避免靠 `error.code === 'active_job_exists'`
+   * 推導；bootstrap 會清 error，但這個 flag 由 caller（startConversion 409 分支）
+   * 在 bootstrap 前設好、bootstrap 不主動清，由 user dismiss（reset）才清。
+   */
+  switchedFromActiveJob: boolean;
+
+  /**
+   * Idle 表單草稿（F-T9 M1）—— 跨 IdleForm mount/unmount 保留使用者設定。
+   *
+   * 生命週期：
+   *   - init：DEFAULT_FORM_DRAFT（chip=KL720，其他為空）
+   *   - 使用者編輯 IdleForm → updateFormDraft({...})
+   *   - startConversion 上傳失敗回 idle → **不**清（讓 user 直接看到上次設定）
+   *   - clearFormDraft()：startConversion 上傳成功進 uploading 後 / reset() 時清
+   */
+  formDraft: ConversionFormDraft;
+}
+
+export interface ConversionStoreActions {
+  /** boot：app start / 進入 `/conversion` 時呼叫，從 backend 拿 active job 重建 UI */
+  bootstrap: () => Promise<void>;
+
+  /** 啟動轉檔（XHR upload + 進度 + AbortController；上傳完成自動進 polling） */
+  startConversion: (args: StartConversionArgs) => Promise<void>;
+
+  /** 開始 polling（store 內部自己 setTimeout） */
+  startPolling: () => void;
+
+  /** 停止 polling（清 timer + listener） */
+  stopPolling: () => void;
+
+  /** 加到模型庫；回傳 model_id 給 UI 跳頁 */
+  promoteToModels: (name?: string) => Promise<{ model_id: string }>;
+
+  /** 重置 UI 回 idle（user dismiss 結果頁；reset 不會主動 cancel backend job） */
+  reset: () => void;
+
+  /** 取消上傳（中途）—— AbortController.abort + 立刻轉 idle */
+  cancelUpload: () => void;
+
+  /** F-T9 M1：更新 IdleForm 表單草稿（partial patch） */
+  updateFormDraft: (patch: Partial<ConversionFormDraft>) => void;
+
+  /** F-T9 M1：清空 IdleForm 表單草稿回預設（chip=KL720、其他為空） */
+  clearFormDraft: () => void;
+
+  /* ------------ test helpers（_ 開頭，沿用 model-store / device-store 規範） ------------ */
+  /** 直接塞 state（測試用） */
+  _setState: (partial: Partial<ConversionStoreState>) => void;
+}
+
+export type ConversionStore = ConversionStoreState & ConversionStoreActions;
+
+/* -------------------------------------------------------------------------- */
+/* Internal scheduler — recursive setTimeout                                  */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * Polling scheduler 的內部狀態（不放進 zustand state，避免 set() 觸發無謂 re-render）。
+ *
+ * 這些變數是模組私有的，但 store 只允許單一 active；多 tab 各自一份。
+ */
+interface PollScheduler {
+  /** 當前排程的 timer id（給 stopPolling 清） */
+  timerId: ReturnType<typeof setTimeout> | null;
+  /** 當前 polling 用的 AbortController（給 stopPolling 中斷正在跑的 fetch） */
+  abortController: AbortController | null;
+  /** 是否已掛上 visibilitychange listener（避免重複掛） */
+  visibilityHooked: boolean;
+}
+
+const scheduler: PollScheduler = {
+  timerId: null,
+  abortController: null,
+  visibilityHooked: false,
+};
+
+/** 上傳的 AbortController；也用在「切頁面 cleanup」時 */
+let uploadAbortController: AbortController | null = null;
+
+/* -------------------------------------------------------------------------- */
+/* state machine helpers                                                      */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * 把 backend 的 ConversionStatus 翻成 UI state（不做合法性檢查，呼叫端自己判斷轉換規則）。
+ *
+ * Phase 0.8 conversion (見 .autoflow/03-design/flows/flow-conversion.md §4 state machine)
+ */
+function mapJobStatusToUI(status: ConversionStatus): ConversionUIState {
+  switch (status) {
+    case "queued":
+      return "queued";
+    case "running":
+      return "running";
+    case "succeeded":
+      return "succeeded";
+    case "failed":
+      return "failed";
+    default:
+      // exhaustive — TS 會抓
+      return "idle";
+  }
+}
+
+/**
+ * Job 是否已過期（expires_at < now）。
+ *
+ * 用途：bootstrap / polling 收到 job 後判斷要不要切 expired 狀態。
+ */
+function isJobExpired(job: ConversionJob): boolean {
+  if (!job.expires_at) return false;
+  const expiresAt = Date.parse(job.expires_at);
+  if (!Number.isFinite(expiresAt)) return false;
+  return expiresAt < Date.now();
+}
+
+/**
+ * 把 ConversionAPIError（或任意錯誤）轉成 store 對外暴露的 ConversionStoreError。
+ */
+function toStoreError(err: unknown): ConversionStoreError {
+  if (err instanceof ConversionAPIError) {
+    return {
+      code: err.code,
+      message: err.message,
+      status: err.status,
+      requestId: err.requestId,
+    };
+  }
+  if (err instanceof Error) {
+    return { code: "unknown", message: err.message, status: 0 };
+  }
+  return { code: "unknown", message: String(err), status: 0 };
+}
+
+/* -------------------------------------------------------------------------- */
+/* visibility listener — 只掛一次                                              */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * Phase 0.8 conversion (見 .autoflow/03-design/flows/flow-conversion.md §5.4 polling 策略)
+ *
+ * tab 切走暫停 polling、回來立刻補打一次。掛在 store 第一次 startPolling 時。
+ *
+ * 用 named function 而不是 inline，方便 stopPolling 清掉同一個 reference。
+ */
+function onVisibilityChange(): void {
+  if (typeof document === "undefined") return;
+  const isVisible = document.visibilityState === "visible";
+  const state = useConversionStore.getState();
+  const isPollingPhase =
+    state.uiState === "queued" || state.uiState === "running";
+
+  if (isVisible && isPollingPhase) {
+    // 回到前景：清掉現有排程、立刻打一次（pollOnce 結束會排下一次）
+    if (scheduler.timerId !== null) {
+      clearTimeout(scheduler.timerId);
+      scheduler.timerId = null;
+    }
+    void pollOnce();
+  } else if (!isVisible && scheduler.timerId !== null) {
+    // 切走：暫停下次排程（正在跑的 fetch 不打斷，讓它自然結束）
+    clearTimeout(scheduler.timerId);
+    scheduler.timerId = null;
+  }
+}
+
+function ensureVisibilityHook(): void {
+  if (scheduler.visibilityHooked) return;
+  if (typeof document === "undefined") return;
+  document.addEventListener("visibilitychange", onVisibilityChange);
+  scheduler.visibilityHooked = true;
+}
+
+function removeVisibilityHook(): void {
+  if (!scheduler.visibilityHooked) return;
+  if (typeof document === "undefined") return;
+  document.removeEventListener("visibilitychange", onVisibilityChange);
+  scheduler.visibilityHooked = false;
+}
+
+/* -------------------------------------------------------------------------- */
+/* Polling — recursive setTimeout                                             */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * 計算下一次 polling 間隔。
+ *
+ * 規則（flow-conversion.md §5.4 + api-conversion.md §2）：
+ *   - status=queued → 10s（converter 還沒開始）
+ *   - status=running → 5s
+ *   - 連續失敗 → 指數退避 10s / 20s / 30s（上限 30s）
+ */
+function nextPollDelay(uiState: ConversionUIState, errorCount: number): number {
+  if (errorCount > 0) {
+    const delay = POLL_BACKOFF_BASE_MS * Math.pow(2, errorCount - 1);
+    return Math.min(delay, POLL_BACKOFF_MAX_MS);
+  }
+  if (uiState === "queued") return POLL_INTERVAL_QUEUED_MS;
+  return POLL_INTERVAL_RUNNING_MS;
+}
+
+/** 排下一次 poll；只在仍處於 polling 階段 + 分頁可見 + 沒有既存 timer 時才排 */
+function schedulePoll(): void {
+  const state = useConversionStore.getState();
+  const isPollingPhase =
+    state.uiState === "queued" || state.uiState === "running";
+  if (!isPollingPhase) return;
+  if (scheduler.timerId !== null) return; // 已排過
+
+  // tab 切走：不排，等 visibilitychange 觸發 pollOnce
+  if (typeof document !== "undefined" && document.hidden) return;
+
+  const delay = nextPollDelay(state.uiState, state.pollErrorCount);
+  scheduler.timerId = setTimeout(() => {
+    scheduler.timerId = null;
+    void pollOnce();
+  }, delay);
+}
+
+/** 打一次 GET /api/conversion/{job_id}，依結果更新 state + 排下一次 */
+async function pollOnce(): Promise<void> {
+  const state = useConversionStore.getState();
+  const job = state.job;
+  // 沒 job / 不在 polling 階段 → 直接結束
+  if (!job || (state.uiState !== "queued" && state.uiState !== "running")) {
+    return;
+  }
+
+  // 取消上一次未完成的 fetch（理論上 schedulePoll 不會 overlap，但保險）
+  if (scheduler.abortController) {
+    scheduler.abortController.abort();
+  }
+  const ctrl = new AbortController();
+  scheduler.abortController = ctrl;
+
+  try {
+    const fresh = await getConversion(job.job_id, ctrl.signal);
+
+    // 已過期 → 切 expired
+    if (isJobExpired(fresh)) {
+      stopPollingInternal();
+      useConversionStore.setState({
+        uiState: "expired",
+        job: fresh,
+        pollErrorCount: 0,
+        pollVisibleError: false,
+      });
+      return;
+    }
+
+    const nextUIState = mapJobStatusToUI(fresh.status);
+    if (nextUIState === "succeeded" || nextUIState === "failed") {
+      stopPollingInternal();
+      useConversionStore.setState({
+        uiState: nextUIState,
+        job: fresh,
+        pollErrorCount: 0,
+        pollVisibleError: false,
+        // failed 時把 error 物件提到 top-level error，方便 UI 取
+        error:
+          nextUIState === "failed" && fresh.error
+            ? {
+                code: fresh.error.code,
+                message: fresh.error.message,
+                status: 0,
+              }
+            : null,
+      });
+      return;
+    }
+
+    // queued / running 之間切換
+    useConversionStore.setState({
+      uiState: nextUIState,
+      job: fresh,
+      pollErrorCount: 0,
+      pollVisibleError: false,
+    });
+    schedulePoll();
+  } catch (err) {
+    // AbortError（人為打斷）→ 不算錯誤
+    if (err instanceof ConversionAPIError && err.code === "aborted") {
+      return;
+    }
+
+    // 5xx / 網路錯誤：累計 + 指數退避
+    const nextErrorCount = state.pollErrorCount + 1;
+    useConversionStore.setState({
+      pollErrorCount: nextErrorCount,
+      pollVisibleError: nextErrorCount >= POLL_GIVE_UP_VISIBLE_THRESHOLD,
+    });
+    schedulePoll();
+  } finally {
+    if (scheduler.abortController === ctrl) {
+      scheduler.abortController = null;
+    }
+  }
+}
+
+/** 內部用 stopPolling — 清 timer + 中斷正在跑的 fetch；不動 state */
+function stopPollingInternal(): void {
+  if (scheduler.timerId !== null) {
+    clearTimeout(scheduler.timerId);
+    scheduler.timerId = null;
+  }
+  if (scheduler.abortController) {
+    scheduler.abortController.abort();
+    scheduler.abortController = null;
+  }
+  removeVisibilityHook();
+}
+
+/* -------------------------------------------------------------------------- */
+/* Store 實作                                                                  */
+/* -------------------------------------------------------------------------- */
+
+/**
+ * F-T9 M1：IdleForm 預設表單草稿（chip=KL720 對齊 IdleForm 的 DEFAULT_CHIP）。
+ *
+ * 抽出來是因為 reset() 與 clearFormDraft() 都要回到同一個基準。
+ */
+const DEFAULT_FORM_DRAFT: ConversionFormDraft = {
+  fileName: null,
+  fileSize: null,
+  refImagesNames: [],
+  targetChip: "KL720",
+  taskName: "",
+  taskNameTouched: false,
+};
+
+const initialState: ConversionStoreState = {
+  uiState: "idle",
+  job: null,
+  uploadProgress: null,
+  error: null,
+  isInitializing: false,
+  pollErrorCount: 0,
+  pollVisibleError: false,
+  switchedFromActiveJob: false,
+  formDraft: DEFAULT_FORM_DRAFT,
+};
+
+export const useConversionStore = create<ConversionStore>()((set, get) => ({
+  ...initialState,
+
+  bootstrap: async () => {
+    // 避免重複 boot
+    if (get().isInitializing) return;
+    set({ isInitializing: true, error: null });
+    try {
+      const job = await getActiveConversion();
+      if (!job) {
+        set({
+          uiState: "idle",
+          job: null,
+          isInitializing: false,
+          pollErrorCount: 0,
+          pollVisibleError: false,
+        });
+        return;
+      }
+
+      // 已過期：直接落 expired
+      if (isJobExpired(job)) {
+        set({
+          uiState: "expired",
+          job,
+          isInitializing: false,
+          pollErrorCount: 0,
+          pollVisibleError: false,
+        });
+        return;
+      }
+
+      const uiState = mapJobStatusToUI(job.status);
+      // queued / running → 開始 polling；succeeded / failed → 直接顯示結果不 polling
+      set({
+        uiState,
+        job,
+        isInitializing: false,
+        pollErrorCount: 0,
+        pollVisibleError: false,
+        error:
+          uiState === "failed" && job.error
+            ? { code: job.error.code, message: job.error.message, status: 0 }
+            : null,
+      });
+      if (uiState === "queued" || uiState === "running") {
+        get().startPolling();
+      }
+    } catch (err) {
+      // bootstrap 失敗：保留 idle，但記下錯誤讓 UI 提示「無法載入轉檔狀態」
+      set({
+        isInitializing: false,
+        error: toStoreError(err),
+      });
+    }
+  },
+
+  startConversion: async (args) => {
+    // 已有 active job 的話按理由 bootstrap / 上一次 reset 已切走；保險起見不動
+    if (get().uiState !== "idle") {
+      // 與 §6.1 對齊：上層 UI 不該在非 idle 時呼叫；若呼叫了直接 throw 讓 UI 處理
+      return;
+    }
+
+    // 清掉殘留的 upload controller
+    if (uploadAbortController) {
+      uploadAbortController.abort();
+    }
+    uploadAbortController = new AbortController();
+    const ctrl = uploadAbortController;
+
+    set({
+      uiState: "uploading",
+      job: null,
+      uploadProgress: { loaded: 0, total: args.file.size },
+      error: null,
+      pollErrorCount: 0,
+      pollVisibleError: false,
+      // 啟動新轉檔 → 清掉「已切換到既存 job」banner flag
+      // （只有等下方 catch 收到 409 才會重新 set true）
+      switchedFromActiveJob: false,
+    });
+
+    try {
+      const job = await initConversion({
+        file: args.file,
+        refImages: args.refImages,
+        targetChip: args.targetChip,
+        taskName: args.taskName,
+        signal: ctrl.signal,
+        onUploadProgress: (loaded, total) => {
+          // 只在 ctrl 還是現役 controller 時更新（防 abort 後 race condition）
+          if (uploadAbortController !== ctrl) return;
+          set({ uploadProgress: { loaded, total } });
+        },
+      });
+
+      // 上傳成功：切到對應 polling 階段
+      if (uploadAbortController === ctrl) {
+        uploadAbortController = null;
+      }
+
+      const nextUIState = mapJobStatusToUI(job.status);
+      // 上傳成功理論上 status 是 queued / running；但有極端情況收到 succeeded / failed（converter 極快）
+      if (nextUIState === "succeeded" || nextUIState === "failed") {
+        set({
+          uiState: nextUIState,
+          job,
+          uploadProgress: null,
+          error:
+            nextUIState === "failed" && job.error
+              ? {
+                  code: job.error.code,
+                  message: job.error.message,
+                  status: 0,
+                }
+              : null,
+          // F-T9 M1：上傳成功（即使 backend 秒切 succeeded/failed）後清 formDraft
+          // 這是 user 真正完成提交的時機；下一次回 idle 不該再看到舊 draft
+          formDraft: DEFAULT_FORM_DRAFT,
+        });
+        return;
+      }
+
+      set({
+        uiState: nextUIState,
+        job,
+        uploadProgress: null,
+        // F-T9 M1：上傳成功進 queued/running 後清 formDraft
+        formDraft: DEFAULT_FORM_DRAFT,
+      });
+      get().startPolling();
+    } catch (err) {
+      if (uploadAbortController === ctrl) {
+        uploadAbortController = null;
+      }
+
+      // 取消（cancelUpload 觸發 abort 已經先把 state 切回 idle 了，這裡只負責清 progress）
+      if (err instanceof ConversionAPIError && err.code === "aborted") {
+        // 若 cancelUpload 沒被呼叫，但其他原因 abort（罕見）—— 仍切回 idle
+        if (get().uiState === "uploading") {
+          set({
+            uiState: "idle",
+            uploadProgress: null,
+          });
+        }
+        return;
+      }
+
+      // 409 active_job_exists（flow §6.1）：自動 bootstrap 重抓既存 active job，
+      // 並標記 switchedFromActiveJob = true 讓 UI 顯示「已切換」banner
+      // （i18n: conversion.processing.bannerExisting）。
+      // 不寫 error —— 這不是「錯誤」，是業務狀態切換；error 留給真正失敗的場景。
+      if (err instanceof ConversionAPIError && err.code === "active_job_exists") {
+        set({
+          uiState: "idle",
+          uploadProgress: null,
+          error: null,
+          switchedFromActiveJob: true,
+        });
+        // bootstrap 會重抓並切到對應狀態；switchedFromActiveJob 保留（bootstrap 不清）
+        await get().bootstrap();
+        return;
+      }
+
+      // 其他錯誤：回 idle + 顯示錯誤
+      set({
+        uiState: "idle",
+        uploadProgress: null,
+        error: toStoreError(err),
+      });
+    }
+  },
+
+  startPolling: () => {
+    const { uiState, job } = get();
+    if (!job) return;
+    if (uiState !== "queued" && uiState !== "running") return;
+    ensureVisibilityHook();
+    // 立刻排（從現在算 nextPollDelay；不立刻打，避免 startConversion 後馬上又打一次）
+    schedulePoll();
+  },
+
+  stopPolling: () => {
+    stopPollingInternal();
+  },
+
+  promoteToModels: async (name) => {
+    const { job, uiState } = get();
+    if (!job) {
+      throw new ConversionAPIError(
+        0,
+        "validation_failed",
+        "promoteToModels: no active job",
+      );
+    }
+    if (uiState !== "succeeded") {
+      throw new ConversionAPIError(
+        0,
+        "job_not_completed",
+        "promoteToModels: job not in succeeded state",
+      );
+    }
+    try {
+      const result = await promoteConversionToModels(
+        job.job_id,
+        name ? { name } : {},
+      );
+      // 不切 UI state（succeeded 維持，UI 顯示「已加入模型庫」label）
+      // 清掉 error（避免之前的錯誤訊息殘留）
+      set({ error: null });
+      return result;
+    } catch (err) {
+      // 409 already imported（job 已 promote 過）由 UI 解讀錯誤訊息
+      const storeErr = toStoreError(err);
+      set({ error: storeErr });
+      throw err;
+    }
+  },
+
+  reset: () => {
+    // 中斷 upload / polling，但**不**主動 cancel backend job
+    // （§5.5 / §5.6：success/failed 後按「開始新轉檔」不需要清 backend；converter 7 天 GC）
+    if (uploadAbortController) {
+      uploadAbortController.abort();
+      uploadAbortController = null;
+    }
+    stopPollingInternal();
+
+    set({
+      ...initialState,
+    });
+  },
+
+  cancelUpload: () => {
+    if (get().uiState !== "uploading") return;
+    if (uploadAbortController) {
+      uploadAbortController.abort();
+      uploadAbortController = null;
+    }
+    // 立刻切 idle（initConversion 的 catch 也會看到 aborted，但 state 已先回 idle）
+    // 注意：cancelUpload 視為「使用者主動放棄這次上傳」—— formDraft **保留**，user 切回
+    // idle 後可以調整再送一次
+    set({
+      uiState: "idle",
+      uploadProgress: null,
+      error: null,
+    });
+  },
+
+  updateFormDraft: (patch) => {
+    set((state) => ({ formDraft: { ...state.formDraft, ...patch } }));
+  },
+
+  clearFormDraft: () => {
+    set({ formDraft: DEFAULT_FORM_DRAFT });
+  },
+
+  _setState: (partial) => set(partial),
+}));
diff --git a/visionA-frontend/src/types/conversion.ts b/visionA-frontend/src/types/conversion.ts
new file mode 100644
index 0000000..8a24025
--- /dev/null
+++ b/visionA-frontend/src/types/conversion.ts
@@ -0,0 +1,102 @@
+/**
+ * Conversion 轉檔功能 — 型別定義（Phase 0.8）
+ *
+ * 對齊：
+ *   - `.autoflow/04-architecture/api/api-conversion.md`（Frontend ↔ visionA-backend API 契約）
+ *   - `.autoflow/04-architecture/conversion.md` §6（錯誤碼 mapping）
+ *
+ * 設計原則：
+ *   1. **UI / Store 層使用 camelCase + 大寫前綴 chip 名稱（KL520 等）** — 與 wireframe 一致。
+ *      backend wire format 的 snake_case + 數字字串（"520"）由 `lib/api/conversion.ts` 的
+ *      normalizer 負責雙向轉換，store / UI 不需感知。
+ *   2. **status enum 統一**：backend 用 `created` / `running` / `completed` / `failed`，
+ *      此處正規化為 `queued` / `running` / `succeeded` / `failed`（與 store / wireframe 對齊）。
+ *   3. **error 物件化**：backend 在 job poll response 用 `error_code` + `error_message` 兩欄，
+ *      此處包成 `error: { code, message? }` 方便 UI 直接 i18n（`conversion.error.<code>`）。
+ *   4. **error.code 不在這層翻譯成 i18n key** — 保留 backend 原始 code，store / UI 再 mapping
+ *      到 `conversion.error.<code>`（見 `conversion.md` §6 / `api-conversion.md` 錯誤碼總覽）。
+ */
+
+/** 對外（UI）統一狀態 — 對齊 wireframe / store 用語 */
+export type ConversionStatus = "queued" | "running" | "succeeded" | "failed";
+
+/** 對外（UI）統一目標晶片 — 對齊 model-store / wireframe 用語 */
+export type TargetChip = "KL520" | "KL630" | "KL720" | "KL730";
+
+/** 轉檔內部 stage（converter 回傳） */
+export type ConversionStage = "onnx" | "bie" | "nef";
+
+/** Job poll / active 共用 shape — `lib/api/conversion.ts` 的所有 fetch 都會 normalize 成這個 */
+export interface ConversionJob {
+  /** UUID（converter 配發） */
+  job_id: string;
+  status: ConversionStatus;
+  /** running 時才有 */
+  stage?: ConversionStage;
+  /** 0–100，整體進度（converter `progress` 欄）；optional 因為剛 init 時可能還沒回 */
+  progress?: number;
+  /** 原始上傳檔名（顯示用，例：`yolov5s.onnx`） */
+  source_filename: string;
+  /** 對外用大寫 KL 前綴；wire format 的 `520` / `720` / `630` / `730` 已被 normalize */
+  target_chip: TargetChip;
+  /** RFC3339 */
+  created_at: string;
+  /** RFC3339（`created_at + 7d` — converter GC 截止時間） */
+  expires_at: string;
+  /** failed 時才有 */
+  error?: ConversionError;
+  /** succeeded 時才有（promote 後才有 model_id；此處先放 metadata） */
+  result?: ConversionResult;
+}
+
+/** 失敗時的錯誤資訊（backend 拆 `error_code` + `error_message` 兩欄；此處合併成物件） */
+export interface ConversionError {
+  /**
+   * 機器可讀錯誤代號 — 對應 `conversion.md` §6 / wireframe F5 表的清單：
+   *   `UNSUPPORTED_FORMAT` / `INVALID_CHECKSUM` / `QUANTIZATION_FAILED`
+   *   / `MODEL_TOO_LARGE` / `QUOTA_EXCEEDED` / `unknown`
+   * UI 層用 `conversion.error.<code>` 取 i18n。
+   */
+  code: string;
+  /** 後端附帶的原始訊息（debug 用，UI 預設不直接顯示） */
+  message?: string;
+}
+
+/** 成功時的轉檔結果 metadata（不含 download URL — 下載走 `getConversionDownloadURL`） */
+export interface ConversionResult {
+  output_size_bytes: number;
+  /** SHA-256（converter 提供時帶上；optional） */
+  output_checksum?: string;
+}
+
+/** `GET /api/conversion/active` 沒有 active job 時，client 適配為 null */
+export type ActiveConversionResponse = ConversionJob | null;
+
+/** `POST /api/conversion/init` 的 client 入參 */
+export interface InitConversionArgs {
+  /** 主模型檔（`.onnx` / `.tflite`，≤ 500MB） */
+  file: File;
+  /** 0–100 張 reference images（≤ 10MB / 張） */
+  refImages?: File[];
+  /** 目標晶片（UI 大寫格式；client 內部轉為 wire 的 `520` / `720` / ...） */
+  targetChip: TargetChip;
+  /** 顯示名（會傳成 backend 的 `model_id` text 欄；wireframe 對應「任務名稱」輸入） */
+  taskName?: string;
+  /** 版本字串（backend 必填；UI 預設 `v1.0.0`） */
+  version?: string;
+  /** XHR 上傳進度 callback */
+  onUploadProgress?: (loaded: number, total: number) => void;
+  /** 取消訊號（使用者按「取消」/ 切頁） */
+  signal?: AbortSignal;
+}
+
+/** `POST /api/conversion/{job_id}/promote-to-models` 的 client 入參 */
+export interface PromoteConversionBody {
+  /** 顯示名；省略時 backend 用 `{source_filename_stem}_{target_chip}` 作預設 */
+  name?: string;
+}
+
+/** Promote 成功後回傳 — UI 拿 `model_id` 跳到 `/models/:id` */
+export interface PromoteConversionResult {
+  model_id: string;
+}