feat.完善了时钟轻应用，为启动器提供了多语言支持

.trae/specs/clock-air-app-mvp/checklist.md

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+# Checklist
+
+- [x] Clicking `DesktopClock` and `DesktopWorldClock` opens the same global Clock Air APP type.
+- [x] Repeated `world-clock` open requests use the global `world-clock:clock-suite:global` instance key.
+- [x] Whiteboard Air APP keeps its per-component instance key behavior.
+- [x] Clock Air APP opens as a normal application window, not a desktop-layer window.
+- [x] Clock Air APP settings are independent from desktop clock widget settings.
+- [x] Corrupt Clock Air APP settings fall back to defaults.
+- [x] World clock time labels support 12-hour, 24-hour, and follow-system formatting.
+- [x] Added localization keys are present in all four supported language files.
+- [x] Build and automated tests pass.
+- [ ] Manual visual verification in all four languages.
+- [ ] Manual verification that minimizing keeps stopwatch and timer running while closing stops them.

.trae/specs/clock-air-app-mvp/spec.md

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+# Clock Air APP MVP
+
+## Goal
+
+Upgrade the built-in `world-clock` Air APP into a focused clock suite while keeping desktop clock widgets as lightweight launch entry points.
+
+## Scope
+
+- Keep the existing Air APP id `world-clock` for Launcher lifecycle compatibility.
+- Use one global Clock Air APP instance for every clock widget entry point.
+- Provide four tabs: World Clock, Stopwatch, Timer, and Settings.
+- Store Clock Air APP settings independently from desktop widget settings at `AirApps/Clock/settings.json`.
+- Follow the host language setting and provide localized text for `zh-CN`, `en-US`, `ja-JP`, and `ko-KR`.
+
+## Behavior
+
+- `world-clock` opens as a standard resizable FluentAvalonia window.
+- The default window size is approximately `780x560`, with a minimum of `680x480`.
+- World Clock shows local time and a configurable city list.
+- Default city list is Beijing, London, Sydney, and New York.
+- Users can add, remove, and reorder city entries during the Air APP session; the list persists across restarts.
+- Stopwatch supports start, pause, resume, lap, and reset; laps are kept in the current window session, up to 50 entries.
+- Timer supports fixed presets, a custom minute duration, start, pause, resume, reset, and a completed state.
+- Closing the Clock Air APP stops stopwatch and timer activity.
+- Minimizing the window keeps stopwatch and timer activity running.
+- Timer completion can activate the Clock Air APP window when the setting is enabled.
+
+## Settings
+
+- Time format: follow system, 24-hour, or 12-hour.
+- Show seconds.
+- Startup tab: last used tab, World Clock, Stopwatch, or Timer.
+- Activate window when timer finishes.
+
+## Out of Scope
+
+- Desktop clock widget visual redesign.
+- Alarms.
+- Focus mode.
+- System notifications.
+- Running stopwatch or timer after the Air APP window is closed.
+- Third-party plugin Air APP declarations.

.trae/specs/clock-air-app-mvp/tasks.md

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+# Tasks
+
+- [x] Add Clock Air APP settings snapshot and JSON store.
+- [x] Add shared Clock Air APP time formatting helpers.
+- [x] Add stopwatch and timer state models with focused tests.
+- [x] Replace the old world-clock view with `ClockAirAppView`.
+- [x] Configure `world-clock` as a standard resizable Air APP window.
+- [x] Make `world-clock` use a global single-instance key independent of source component id.
+- [x] Add world clock city add, remove, and reorder behavior.
+- [x] Add stopwatch tab with lap support.
+- [x] Add timer tab with presets and custom duration.
+- [x] Add independent Clock Air APP settings tab.
+- [x] Add `zh-CN`, `en-US`, `ja-JP`, and `ko-KR` localization keys.
+- [x] Ensure AirAppHost output includes localization JSON resources.
+- [x] Add regression tests for Launcher keying, descriptors, settings, formatting, stopwatch, timer, and localization coverage.