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

frontend/src/lib/components/booking/BookingFlow.svelte

@@ -1561,7 +1561,7 @@
 
 	{#if !authReady}
 		<div class="mb-6 flex items-center justify-center gap-2">
-			{#each [1, 2, 3, 4] as _}
+			{#each [1, 2, 3, 4] as _ (_)}
 				<div class="flex items-center gap-1">
 					<div class="h-8 w-8 animate-pulse rounded-full bg-gray-200" />
 					<div class="h-3 w-16 animate-pulse rounded bg-gray-200" />
@@ -2088,7 +2088,7 @@
 									{/each}
 									<div class="border-t pt-2">
 										{#if discountPreview?.eligible}
-											{#each discountPreview.discounts as d}
+											{#each discountPreview.discounts as d (d.name)}
 												<div class="flex justify-between text-sm text-gray-600">
 													<span>{d.name}</span>
 													<span>-£{d.amount.toFixed(2)}</span>