style: fix prefer-svelte-reactivity — replace with Svelte reactive equivalents

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

@@ -8,6 +8,7 @@
 	import * as Modal from '$lib/components/ui/dialog';
 	import { Skeleton } from '$lib/components/ui/skeleton';
 	import { formatUserName } from '$lib/utils/nameDisplay';
+import { SvelteDate, SvelteURLSearchParams } from 'svelte/reactivity';
 
 	interface GiftCard {
 		id: string;
@@ -252,7 +253,7 @@
 		loading = true;
 		loadingSearch = true;
 		try {
-			const params = new URLSearchParams({
+			const params = new SvelteURLSearchParams({
 				page: page.toString(),
 				per_page: '10'
 			});
@@ -779,7 +780,7 @@
 	}
 
 	function formatDate(dateStr: string): string {
-		return new Date(dateStr).toLocaleDateString('en-GB', {
+		return new SvelteDate(dateStr).toLocaleDateString('en-GB', {
 			day: 'numeric',
 			month: 'short',
 			year: 'numeric',
@@ -789,14 +790,14 @@
 
 	function getExpiryDate(lastUsedAt?: string): Date | null {
 		if (!lastUsedAt) return null;
-		const date = new Date(lastUsedAt);
+		const date = new SvelteDate(lastUsedAt);
 		date.setMonth(date.getMonth() + 24);
 		return date;
 	}
 
 	function isExpired(lastUsedAt?: string): boolean {
 		const expiry = getExpiryDate(lastUsedAt);
-		return expiry !== null && expiry < new Date();
+		return expiry !== null && expiry < new SvelteDate();
 	}
 
 	// =============== Sorting ===============
@@ -854,7 +855,7 @@
 				case 'remaining':
 					return (a.amount_remaining - b.amount_remaining) * mul;
 				case 'created':
-					return (new Date(a.created_at).getTime() - new Date(b.created_at).getTime()) * mul;
+					return (new SvelteDate(a.created_at).getTime() - new SvelteDate(b.created_at).getTime()) * mul;
 				case 'status': {
 					const aVal = a.redeemed_by ? 2 : a.amount_remaining === 0 ? 1 : 0;
 					const bVal = b.redeemed_by ? 2 : b.amount_remaining === 0 ? 1 : 0;
@@ -883,7 +884,7 @@
 				case 'balance':
 					return (a.balance - b.balance) * mul;
 				case 'updated':
-					return (new Date(a.updated_at).getTime() - new Date(b.updated_at).getTime()) * mul;
+					return (new SvelteDate(a.updated_at).getTime() - new SvelteDate(b.updated_at).getTime()) * mul;
 				default:
 					return 0;
 			}