fixes

frontend/src/routes/account/+page.svelte

@@ -133,7 +133,7 @@
 			});
 			if (res.ok) {
 				toast.success('Card removed');
-				savedCardsStore = savedCardsStore.filter((c) => c.id !== card.id);
+				await savedCardsStore.invalidate();
 			} else {
 				toast.error('Failed to remove card');
 			}
@@ -169,6 +169,14 @@
 	let buyingGiftCard = $state(false);
 	let purchaseResultCode = $state<string | null>(null);
 
+	$effect(() => {
+		if (savedCardsStore.cards.length > 0 && !buySelectedCard) {
+			const defaultCard =
+				savedCardsStore.cards.find((c) => c.is_default) || savedCardsStore.cards[0];
+			buySelectedCard = defaultCard.id;
+		}
+	});
+
 	function parseExpiryParts(value: string): { month: number; year: number } | null {
 		if (!/^\d{2}\/\d{2}$/.test(value)) return null;
 		const [monthStr, yearStr] = value.split('/');
@@ -414,7 +422,7 @@
 	}
 
 	$effect(() => {
-		if (savedCardsStore.length === 0 && buySelectedCard !== '') {
+		if (savedCardsStore.cards.length === 0 && buySelectedCard !== '') {
 			buySelectedCard = '';
 		}
 	});
@@ -1804,14 +1812,14 @@
 									</Button>
 								</div>
 							</div>
-						{:else if savedCardsStore.length === 0}
+						{:else if savedCardsStore.cards.length === 0}
 							<div class="py-8 text-center">
 								<p class="text-gray-500">No saved cards yet</p>
 								<Button class="mt-4" onclick={() => (showAddCard = true)}>Add a Card</Button>
 							</div>
 						{:else}
 							<div class="space-y-3">
-								{#each savedCardsStore as card (card.id)}
+								{#each savedCardsStore.cards as card (card.id)}
 									<div class="flex items-center justify-between rounded-lg border p-4">
 										<div class="flex items-center gap-3">
 											<div
@@ -2045,9 +2053,9 @@
 									<span class="block text-xs font-semibold tracking-wider text-gray-500 uppercase"
 										>Payment Method</span
 									>
-									{#if savedCardsStore.length > 0}
+									{#if savedCardsStore.cards.length > 0}
 										<div class="space-y-2">
-											{#each savedCardsStore as card (card.id)}
+											{#each savedCardsStore.cards as card (card.id)}
 												<button
 													type="button"
 													class="flex w-full items-center justify-between rounded-lg border p-3 text-left {buySelectedCard ===