- Implemented shadcn/ui date picker with Czech localization
- Added month/year dropdown navigation for easy date selection
- Fixed critical timezone bug causing "No valid days found" error
- Changed from toISOString() to local date formatting
- Dates now correctly sent as 2025-01-01 instead of 2024-12-31
- Calendar auto-closes after date selection
- All features tested and working:
- Journey calculation with correct date ranges
- "Vyplnit na web" button visible and functional
- Excel export working
- Backend successfully processes January 2025 data
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Co-Authored-By: Claude <noreply@anthropic.com>
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