feat: use availability rate overrides in calendar tooltip and booking modal

- Load rate_overrides in CalendarPage, pass as priceOverrides to BookingCalendar
- Tooltip shows override price for the hovered date (falls back to baseRate)
- BookingModal sums per-night prices from overrides for the stay period
- Room baseRate now only used as initial default for availability grid

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

src/pages/CalendarPage.tsx

@@ -23,20 +23,29 @@ export function CalendarPage() {
   const [rentalObjects, setRentalObjects] = useState<RentalObjectApi[]>([])
   const [rentalBookings, setRentalBookings] = useState<RentalBookingApi[]>([])
   const [locks, setLocks] = useState<Map<string, BookingLock>>(new Map())
+  const [priceOverrides, setPriceOverrides] = useState<Record<string, Record<string, number>>>({})
 
   useEffect(() => {
     if (!slug) return
     const fetches: Promise<unknown>[] = [
       api.rooms.list(slug),
       api.bookings.list(slug),
+      api.rateOverrides.list(slug).catch(() => []),
     ]
     if (isRentalActive) {
       fetches.push(api.rental.listObjects(slug))
       fetches.push(api.rental.listBookings(slug))
     }
-    Promise.all(fetches).then(([r, b, ro, rb]) => {
+    Promise.all(fetches).then(([r, b, overrides, ro, rb]) => {
       setRooms(r as Room[])
       setBookings(b as Booking[])
+      // Build categoryId → date → price lookup
+      const map: Record<string, Record<string, number>> = {}
+      for (const o of overrides as import('../lib/api').RateOverrideApi[]) {
+        if (!map[o.categoryId]) map[o.categoryId] = {}
+        map[o.categoryId][o.date] = o.price
+      }
+      setPriceOverrides(map)
       if (isRentalActive) {
         setRentalObjects(ro as RentalObjectApi[])
         setRentalBookings(rb as RentalBookingApi[])
@@ -192,6 +201,7 @@ export function CalendarPage() {
           onDraftStart={handleDraftStart}
           onDraftCancel={handleDraftCancel}
           wsConnected={connected}
+          priceOverrides={priceOverrides}
         />
       </div>
     </div>