visionA/local-tool/frontend/src/stores/settings-store.ts

import { create } from 'zustand';
import { persist } from 'zustand/middleware';

interface SettingsState {
  theme: 'light' | 'dark';
  language: 'zh-TW' | 'en';
  setTheme: (theme: 'light' | 'dark') => void;
  setLanguage: (language: 'zh-TW' | 'en') => void;
  resetToDefaults: () => void;
}

const defaults = {
  theme: 'light' as const,
  language: 'zh-TW' as const,
};

export const useSettingsStore = create<SettingsState>()(
  persist(
    (set) => ({
      ...defaults,

      setTheme: (theme) => set({ theme }),
      setLanguage: (language) => set({ language }),
      resetToDefaults: () => set(defaults),
    }),
    { name: 'settings', skipHydration: true },
  ),
);