- Add recurring activities feature (daily, weekly, monthly)
- Auto-join with guest count for recurring series
- Parent-child relationship for recurring instances
- 'Opakovaná' badge and upcoming instances section
- Smart delete logic (promote first child to parent)
- My Activities page with created/joined tabs
- Map view at /venues with activity markers
- Custom sport icons and user location marker
- InfoWindow with activity details
- Navigation renamed 'Športoviská' to 'Mapa aktivít'
- Fix participation tracking for joined activities
- Database migrations for recurring and guest count fields
