- Add view mode dropdown with "Semaine" (7 days) and "2 semaines" (14 days)
- Biweekly mode shows compact cards (smaller padding, no tablo badge, shorter labels)
- Navigation steps by 1 or 2 weeks based on current view mode
- Dynamic column count and card sizing based on view config
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>