Backend fixes:
- Fix all-day event creation validation error
- Allow same start/end date for all-day events (single-day events)
- Maintain strict validation for timed events (end must be after start)
Frontend improvements:
- Move all-day events from time grid to day headers
- Add dedicated all-day events container that stacks vertically
- Filter all-day events out of main time-based events area
- Add proper CSS styling for all-day event display and interaction
- Maintain event click handling and color themes
All-day events now appear in the correct location at the top of each
day column and properly stack when multiple events exist.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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