feat: unified bug fixes, tutor lifecycle, and room editor refactor
- Security: Fixed RUSTSEC-2023-0071 via aws_lc_rs
- API: Fixed empty 200 body parsing and check-in typing
- Tutors: Added is_active flag, safe deletion with 409 conflict checks, and admin toggle UI
- Rooms: Migrated room layouts from pixel to grid scale, added additive layout validators
- UI: Improved RoomCanvas with dynamic sizing, interactive editing, snap-to-grid
- App: Replaced static SeatMap component with dynamic RoomCanvas across live and checkin views
s0wlz (Matthias Puchstein)
3b9c755e39