new-api

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t0ng7u 61ae19ac82 🌓 feat(ui): add auto theme mode, refactor ThemeToggle, optimize header theme handling

- Feature: Introduce 'auto' theme mode
  - Detect system preference via matchMedia('(prefers-color-scheme: dark)')
  - Add useActualTheme context to expose the effective theme ('light'|'dark')
  - Persist selected mode in localStorage ('theme-mode') with 'auto' as default
  - Apply/remove `dark` class on <html> and sync `theme-mode` on <body>
  - Broadcast effective theme to iframes

- UI: Redesign ThemeToggle with Dropdown items and custom highlight
  - Replace non-existent IconMonitor with IconRefresh
  - Use Dropdown.Menu + Dropdown.Item with built-in icon prop
  - Selected state uses custom background highlight; hover state preserved
  - Remove checkmark; selection relies on background styling
  - Current button icon reflects selected mode

- Performance: reduce re-renders and unnecessary effects
  - Memoize theme options and current button icon (useMemo)
  - Simplify handleThemeToggle to accept only explicit modes ('light'|'dark'|'auto')
  - Minimize useEffect dependencies; remove unrelated deps

- Header: streamline useHeaderBar
  - Use useActualTheme for iframe theme messaging
  - Remove unused statusDispatch
  - Remove isNewYear from theme effect dependencies

- Home: send effective theme (useActualTheme) to external content iframes

- i18n: add/enhance theme-related copy in locales (en/zh)

- Chore: minor code cleanup and consistency
  - Improve readability and maintainability
  - Lint clean; no functional regressions

2025-08-23 03:02:35 +08:00