- Rental bookings now use minutes since midnight (start_hour/end_hour
store e.g. 495 for 8:15, 570 for 9:30) — DB migration 017
- Buffer applied in exact minutes (no hour ceiling): 15min buffer after
9:00 booking → next slot available at 9:15
- Calendar cell: removed working-hours line (8:00–22:00), now shows
colored dot + compact time per booking (8–10, 8:15–9:15)
- Time selects show HH:MM format for 15-min intervals
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
