style: fix no-explicit-any — replace with proper TypeScript types

frontend/src/routes/admin/notifications/+page.svelte

@@ -14,6 +14,7 @@
 	import UserModal from '$lib/components/admin/UserModal.svelte';
 	import EditRequestModal from '$lib/components/admin/EditRequestModal.svelte';
 	import { toast } from 'svelte-sonner';
+	import type { Booking } from '$lib/types/booking';
 
 	interface Notification {
 		id: number;
@@ -68,7 +69,7 @@
 	let includeAcknowledged = $state(false);
 
 	let showApprovalModal = $state(false);
-	let selectedBooking = $state<any>(null);
+	let selectedBooking = $state<Booking | null>(null);
 	let showBookingModal = $state(false);
 	let showUserModal = $state(false);
 	let selectedUserId = $state<string | null>(null);
@@ -154,7 +155,7 @@
 		}
 	}
 
-	async function fetchBookingDetails(bookingId: string): Promise<any> {
+	async function fetchBookingDetails(bookingId: string): Promise<Booking | null> {
 		const response = await fetch(`/api/admin/bookings/${bookingId}`, {
 			headers: { Authorization: `Bearer ${authStore.currentToken}` }
 		});