Address gaps found in verification:
- Fix Google and Apple OAuth callbacks to use real API token exchanges
- Complete calendar event fetching with real API integrations
- Implement bidirectional sync with actual database/calendar operations
- Enable functional calendar connection UI with real OAuth triggers
- Consolidated OAuth and display functionality into single Plan 01 to match roadmap
- Removed redundant Plan 03
- Updated roadmap to reflect correct plan count
- Improved linking between OAuth and display components
- Enhanced action descriptions to clarify integration points
- Fixed requirement coverage for CAL-03 (view calendar events in weekly view)
- Reduced tasks in Plan 01 from 4 to 2 to improve scoping
- Added new Plan 03 for calendar event display functionality
- Updated must_haves to reflect new task structure
