fix: robust night price calculation in BookingModal + clear test DB data

- Use parseISO instead of new Date() for safer date parsing
- Use Math.floor(nights) to avoid float iteration issues
- Type-check override price before using (typeof p === 'number')
- Label now shows actual sum from overrides instead of baseRate × nights

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

src/components/bookings/BookingModal.tsx

@@ -1,5 +1,5 @@
 import { useState, useLayoutEffect, useRef, useEffect } from 'react'
-import { format, addDays } from 'date-fns'
+import { format, addDays, parseISO } from 'date-fns'
 import { Star, Banknote, CreditCard, AlertCircle, Map, Plus, Trash2, Tag, Minus, BedDouble, Tv2, Send, Loader2, CheckCircle2, Clock, CalendarDays, User, Phone } from 'lucide-react'
 import { MOCK_DISCOUNTS } from '../../pages/DiscountsPage'
 import type { Discount } from '../../pages/DiscountsPage'
@@ -332,15 +332,18 @@ export function BookingModal({ open, draft, rooms, bookings = [], onClose, onSav
 
   const hourlyHours = Math.max(0, endHour - startHour)
   // Calculate room cost: sum per-night prices from availability overrides, fall back to baseRate
+  const nightCount = Math.floor(nights)
   const roomNightlyTotal = (() => {
-    if (!room || !form.checkIn || !form.checkOut || nights <= 0) return 0
+    if (!room || !form.checkIn || nightCount <= 0) return 0
     const catId = room.categoryId
     const catOverrides = catId ? priceOverrides?.[catId] : undefined
-    if (!catOverrides) return (room.baseRate ?? 0) * nights
+    const fallback = room.baseRate ?? 0
+    if (!catOverrides) return fallback * nightCount
     let sum = 0
-    for (let i = 0; i < nights; i++) {
-      const d = format(addDays(new Date(form.checkIn), i), 'yyyy-MM-dd')
-      sum += catOverrides[d] ?? room.baseRate ?? 0
+    for (let i = 0; i < nightCount; i++) {
+      const d = format(addDays(parseISO(form.checkIn), i), 'yyyy-MM-dd')
+      const p = catOverrides[d]
+      sum += (typeof p === 'number' && isFinite(p)) ? p : fallback
     }
     return sum
   })()
@@ -1289,7 +1292,7 @@ export function BookingModal({ open, draft, rooms, bookings = [], onClose, onSav
                     <p className="text-xs text-slate-400 mb-0.5">
                       {isHourly && room.allowHourly
                         ? `${hourlyHours} ч × ${(room.hourlyRate ?? 0).toLocaleString('ru-RU')} ₽`
-                        : `${nights} ${nights === 1 ? 'ночь' : nights < 5 ? 'ночи' : 'ночей'} × ${room.baseRate.toLocaleString('ru-RU')} ₽`
+                        : `${nightCount} ${nightCount === 1 ? 'ночь' : nightCount < 5 ? 'ночи' : 'ночей'} · ${roomNightlyTotal.toLocaleString('ru-RU')} ₽`
                       }
                       {discountAmount > 0 && ` − ${discountAmount.toLocaleString('ru-RU')} ₽`}
                     </p>