Petru Paler e971fe683f Add toast notification system with sonner library ...

- Create Toaster component wrapping sonner at bottom-right position
- Add showToast utility with success/error/info methods
- Error toasts persist until dismissed, others auto-dismiss after 5s
- Migrate error handling to toasts across all pages:
  - Dashboard (override toggle errors)
  - Settings (save/load success/error)
  - Garmin settings (connection success/error)
  - Calendar (load errors)
  - Period History (load/delete errors)
- Add dark mode support for toast styling
- Add Toaster provider to root layout
- 27 new tests (23 toaster component + 4 integration)
- Total: 977 unit tests passing

P5.2 COMPLETE - All P0-P5 items now complete.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-12 23:04:27 +00:00

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