- Extract shared utilities and constants to eliminate code duplication
- Create dedicated Calendar page with year view and month grid
- Add date filter navigation with bidirectional URL sync
- Fix useTodayDate memoization bug causing stale date references
- Standardize naming conventions (get vs generate functions)
- Add comprehensive type exports and proper store encapsulation
- Implement size variants for compact calendar display

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