- custom_inference_worker: reuse existing device_group from DeviceController
to avoid double kp.connect_devices() conflict on same USB port
- custom_inference_worker: add TYPE_CHECKING guard for kp type annotations
to prevent potential NameError at import time
- utilities_screen: replace missing back_arrow.png with text arrow (←)
- utilities_screen: add set_device_controller() so AppController can inject
MainWindow's shared DeviceController instance
- main.py: wire UtilitiesScreen to share MainWindow's DeviceController
- video_thread: emit camera_error_signal on failure and max-retry exhaustion
- media_controller: connect camera_error_signal and display error on canvas
- media_panel: fix pause button using wrong delete icon; use video_normal SVG
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
