Displays sync state with:
- Green dot for synced (with relative time)
- Spinner for syncing
- Amber dot for stale (auto-detected after 15min)
- Red dot for error (with retry button)
- Gray dot for offline
Includes 23 tests covering all states, time formatting,
button visibility, and click handlers.
bd-2or
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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