fix: calendar room label dedup + room number validation

- BookingCalendar: remove type badge below room number (already shown in group header)
- RoomModal: validate number against existingNumbers before save
  - Red border + error message if number taken
  - Placeholder shows next free number (e.g. if 101,102 exist → placeholder 103)
  - Save button disabled while number is taken

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

src/components/calendar/BookingCalendar.tsx

@@ -437,11 +437,6 @@ export function BookingCalendar({ rooms, bookings, slug, onBookingCreate, onBook
                         <span className="text-sm font-bold text-slate-900 dark:text-slate-100">{room.number}</span>
                         {room.name && !isMobile && <span className="text-xs text-slate-500 dark:text-slate-400">{room.name}</span>}
                       </div>
-                      {!compact && !isMobile && (
-                        <span className={cn('text-xs px-1.5 py-0.5 rounded-md font-medium', getRoomTypeColor(room.type))}>
-                          {room.type}
-                        </span>
-                      )}
                     </div>
                   </div>
 

src/components/rooms/RoomModal.tsx

@@ -46,6 +46,7 @@ type ModalTab = 'main' | 'places' | 'description' | 'photos'
 interface RoomModalProps {
   open: boolean
   room?: Room
+  existingNumbers?: string[]
   categories?: { id: string; name: string }[]
   onClose: () => void
   onSave: (room: Room) => void
@@ -53,7 +54,7 @@ interface RoomModalProps {
   error?: string | null
 }
 
-export function RoomModal({ open, room, categories = [], onClose, onSave, onDelete, error }: RoomModalProps) {
+export function RoomModal({ open, room, existingNumbers = [], categories = [], onClose, onSave, onDelete, error }: RoomModalProps) {
   const isEdit = !!room
   const [tab, setTab] = useState<ModalTab>('main')
 
@@ -126,8 +127,24 @@ export function RoomModal({ open, room, categories = [], onClose, onSave, onDele
     setPhotoIdx(p => Math.max(0, p - 1))
   }
 
+  // Find next available room number (skips existing ones)
+  const nextFreeNumber = (() => {
+    if (isEdit) return null
+    const taken = new Set(existingNumbers)
+    // Try incrementing from the highest existing number
+    const nums = existingNumbers
+      .map(n => parseInt(n))
+      .filter(n => !isNaN(n))
+      .sort((a, b) => a - b)
+    let candidate = (nums[nums.length - 1] ?? 100) + 1
+    while (taken.has(String(candidate))) candidate++
+    return String(candidate)
+  })()
+
+  const numberTaken = !isEdit && !!form.number && existingNumbers.includes(form.number)
+
   const handleSave = () => {
-    if (!form.number) return
+    if (!form.number || numberTaken) return
     onSave({
       id:                 room?.id ?? `r-${Date.now()}`,
       hotelId:            room?.hotelId ?? 'hotel-1',
@@ -183,7 +200,7 @@ export function RoomModal({ open, room, categories = [], onClose, onSave, onDele
             <p className="text-sm text-red-600 dark:text-red-400 flex-1 text-left">{error}</p>
           )}
           <button onClick={onClose} className="btn-secondary">Отмена</button>
-          <button onClick={handleSave} className="btn-primary" disabled={!form.number}>
+          <button onClick={handleSave} className="btn-primary" disabled={!form.number || numberTaken}>
             {isEdit ? 'Сохранить' : 'Добавить номер'}
           </button>
         </>
@@ -213,7 +230,16 @@ export function RoomModal({ open, room, categories = [], onClose, onSave, onDele
           <div className="grid grid-cols-2 gap-3">
             <div>
               <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-1.5">Номер *</label>
-              <input type="text" className="input" placeholder="101" value={form.number} onChange={e => set('number', e.target.value)} />
+              <input
+                type="text"
+                className={cn('input', numberTaken && 'border-red-400 focus:ring-red-400')}
+                placeholder={nextFreeNumber ?? '101'}
+                value={form.number}
+                onChange={e => set('number', e.target.value)}
+              />
+              {numberTaken && (
+                <p className="text-xs text-red-500 mt-1">Номер {form.number} уже существует{nextFreeNumber ? `. Следующий свободный: ${nextFreeNumber}` : ''}</p>
+              )}
             </div>
             <div>
               <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-1.5">Название</label>