Apply 7 calendar/booking UI improvements

1. Remove redundant "Шахматка бронирований" header from CalendarPage
2. Fix Saturday abbreviation: "су" → "сб" (use EEEEEE format)
3. Compact toggle: add "Вид" text label to button
4. Booking bars: check-in starts at 1/3 cell, check-out ends at 1/3 cell
5. BookingModal: move "Статус гостя" tags to left column
6. BookingDetailPanel: add scan button + print package in Docs tab
7. RentalBookingModal: add payment method + amount section

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

src/data/rentalData.ts

@@ -24,6 +24,7 @@ export interface RentalBooking {
   guestPhone: string
   linkedRoomId?: string
   totalAmount: number
+  paidAmount?: number
   status: 'confirmed' | 'cancelled'
   notes?: string
 }