style: fix require-each-key — add missing keys to all {#each} blocks

frontend/src/lib/components/payments/UserPaymentModal.svelte

@@ -772,7 +772,7 @@
 							{/if}
 						</div>
 						<div class="space-y-2 text-sm">
-							{#each booking.discounts as d}
+							{#each booking.discounts as d (d.id)}
 								<div class="flex items-center justify-between text-gray-600">
 									<div class="flex items-center gap-1.5">
 										<span class="h-1.5 w-1.5 rounded-full bg-fuchsia-400"></span>
@@ -802,7 +802,7 @@
 						>
 					</div>
 					{#if discountPreview?.eligible}
-						{#each discountPreview.discounts as d}
+						{#each discountPreview.discounts as d (d.name)}
 							<div class="flex justify-between text-sm">
 								<span class="text-gray-600">{d.name}</span>
 								<span class="font-medium text-green-700"