- ClassroomRentalsService.create/update now upsert a ClassSchedule row with schedule_type='RENTAL' and rental_id set.
- ClassroomRentalsService.remove deletes the synced schedule row; update to 'cancelled' also removes it.
- SchedulesService.getClassroomOccupancy explicitly returns INTERNAL and RENTAL schedules.
- Make classId/teacherId/rentalId nullable in ClassSchedule entity to support rental schedules.
- Add unit tests for rental schedule sync and mixed-type occupancy.
- App.tsx: remove double-wrapped MainLayout from /notifications route
- NotificationBell.tsx: decouple SSE from popover open state using ref
- useNotifications.ts: fix interval leak in onerror via ref in cleanup
- notifications.controller.ts: unsubscribe on req.on('close') for SSE Subject
- schedules.controller.ts: use existing schedule values in conflict catch
