feat: add email verification, profile pictures, deposits, and calendar

export
Backend:
- Add email verification code generation and verification endpoints
- Add profile picture upload with S3 storage and image processing
- Add deposit_required field to users with 48h advance booking
  requirement
- Add loyalty stamps that accumulate on completed bookings
- Auto-transition bookings: confirmed → in_progress → completed
- Add booking cancellation handler with no-show detection
- Add ICS calendar file download endpoint for bookings
- Sync bookings to CalDAV on confirmation
  Frontend:
- Add schedule page route
- Add avatar and image-cropper UI components
- Update shadcn-svelte components (button, dialog)
- Add "Add to Calendar" button in booking modal
  Database:
- Add verification_codes table
- Add profile_pic_url, loyalty_stamps, deposits_required to users
- Various schema updates

frontend/src/lib/components/admin/ApprovalModal.svelte

@@ -35,7 +35,14 @@
 		overrideDurationMinutes?: number;
 	};
 
-	let notes = $state(booking.notes || '');
+	let notes = $state('');
+
+	// Sync notes with booking.notes when booking changes
+	$effect(() => {
+		if (booking?.notes !== undefined) {
+			notes = booking.notes || '';
+		}
+	});
 	let serviceOverrides = $state<
 		Record<
 			string,