fix: dates timezone, guest lookup fallback to bookings, regex fix

- localDate() uses local timezone instead of UTC (prevents showing yesterday
  after midnight in UTC+3)
- Guest lookup: fallback to bookings table by guest_email/guest_phone when
  no guest profile found in CRM (guests table)
- Fix REGEXP_REPLACE pattern from '\D' (PCRE) to '[^0-9]' (PostgreSQL POSIX)

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

src/pages/BookingWidgetPage.tsx

@@ -195,10 +195,12 @@ export function WidgetPreview({ settings, slug, realRooms, realCategories, payme
   paymentEnabled?: boolean
 }) {
   const [previewTab, setPreviewTab] = useState<'rooms' | 'rental'>('rooms')
-  const todayStr = new Date().toISOString().slice(0, 10)
-  const tomorrowStr = new Date(Date.now() + 86400000).toISOString().slice(0, 10)
-  const [checkIn,  setCheckIn]  = useState(todayStr)
-  const [checkOut, setCheckOut] = useState(tomorrowStr)
+  const localDate = (offsetDays = 0) => {
+    const d = new Date(); d.setDate(d.getDate() + offsetDays)
+    return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`
+  }
+  const [checkIn,  setCheckIn]  = useState(() => localDate(0))
+  const [checkOut, setCheckOut] = useState(() => localDate(1))
   const [guests,   setGuests]   = useState(2)
   const [extraBeds, setExtraBeds] = useState(0)
   const [children, setChildren] = useState(0)