Fix: block drag-to-move if target room has conflicting booking

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

src/components/calendar/BookingCalendar.tsx

@@ -87,8 +87,10 @@ export function BookingCalendar({ rooms, bookings, slug, onBookingCreate, onBook
   const [ghostPos, setGhostPos] = useState<{ x: number; y: number } | null>(null)
   const movingBookingRef = useRef<Booking | null>(null)
   const moveTargetRoomIdRef = useRef<string | null>(null)  // всегда актуален, без stale closure
+  const bookingsRef = useRef<Booking[]>(bookings)
   const didDragRef = useRef(false)
   movingBookingRef.current = movingBooking
+  bookingsRef.current = bookings
 
   // Compact mode (default from Settings → Appearance)
   const [compact, setCompact] = useState(
@@ -510,9 +512,18 @@ export function BookingCalendar({ rooms, bookings, slug, onBookingCreate, onBook
                                 // Читаем из ref — всегда актуальное значение, не stale closure
                                 const targetRoomId = moveTargetRoomIdRef.current
                                 if (targetRoomId && targetRoomId !== booking.roomId) {
+                                  // Проверяем конфликт в целевом номере
+                                  const hasConflict = bookingsRef.current.some(b =>
+                                    b.roomId === targetRoomId &&
+                                    b.id !== booking.id &&
+                                    b.status !== 'cancelled' && b.status !== 'no_show' && b.status !== 'checked_out' &&
+                                    b.checkIn < booking.checkOut && b.checkOut > booking.checkIn,
+                                  )
+                                  if (!hasConflict) {
                                     didDragRef.current = true
                                     onBookingUpdate(booking.id, { roomId: targetRoomId })
                                   }
+                                }
                                 setMovingBooking(null)
                                 setMoveTargetRoomId(null)
                                 setGhostPos(null)