Add date editing with conflict detection and rental booking editing

- BookingDetailPanel: edit dates/room with inline conflict detection; options to force-save or swap conflicting booking's room
- BookingsPage + CalendarPage: pass rooms/allBookings/onBulkUpdate to panel
- RentalBookingModal: accept editBooking prop to pre-populate fields for editing
- RentalPage: add edit (pencil) button per booking row, unify create/update handler

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/components/calendar/BookingCalendar.tsx

@@ -21,6 +21,7 @@ interface BookingCalendarProps {
   bookings: Booking[]
   onBookingCreate: (b: Partial<Booking>) => void
   onBookingUpdate: (id: string, b: Partial<Booking>) => void
+  onBookingBulkUpdate?: (updates: Array<{ id: string; data: Partial<Booking> }>) => void
   fadingBookingIds?: Set<string>
   rentalObjects?: RentalObject[]
   rentalBookings?: RentalBooking[]
@@ -48,7 +49,7 @@ function getRoomTypeColor(type: string): string {
   return map[type] ?? 'bg-slate-100 text-slate-600 dark:bg-slate-700 dark:text-slate-300'
 }
 
-export function BookingCalendar({ rooms, bookings, onBookingCreate, onBookingUpdate, fadingBookingIds, rentalObjects, rentalBookings, onRentalBookingCreate }: BookingCalendarProps) {
+export function BookingCalendar({ rooms, bookings, onBookingCreate, onBookingUpdate, onBookingBulkUpdate, fadingBookingIds, rentalObjects, rentalBookings, onRentalBookingCreate }: BookingCalendarProps) {
   const [startDate, setStartDate] = useState(() => startOfDay(new Date()))
   const [visibleDays, setVisibleDays] = useState(DAYS_VISIBLE)
 
@@ -602,11 +603,17 @@ export function BookingCalendar({ rooms, bookings, onBookingCreate, onBookingUpd
         <BookingDetailPanel
           booking={selectedBooking}
           room={rooms.find(r => r.id === selectedBooking.roomId)}
+          rooms={rooms}
+          allBookings={bookings}
           onClose={() => setSelectedBooking(null)}
           onUpdate={(id, data) => {
             onBookingUpdate(id, data)
             setSelectedBooking(null)
           }}
+          onBulkUpdate={onBookingBulkUpdate ? (updates) => {
+            onBookingBulkUpdate(updates)
+            setSelectedBooking(null)
+          } : undefined}
         />
       )}