Add search functionality with SearchBar component, update YearDashboard to filter people and gifts based on search input, and enhance GiftModal and PersonModal for better state management.

src/lib/components/molecules/GiftModal.svelte

@@ -7,13 +7,14 @@
 	let { personId, personName } = $props();
 
 	let isOpen = $state(false);
-	let gift: Omit<Gift, 'id' | 'personId'> = $state({
+	const initGift = {
 		name: '',
 		price: 0,
 		url: '',
 		description: '',
 		status: 'PLANNED'
-	});
+	} as const;
+	let gift: Omit<Gift, 'id' | 'personId'> = $state(initGift);
 
 	const open = () => {
 		isOpen = true;
@@ -34,6 +35,8 @@
 				status: gift.status
 			}
 		}).then(close);
+
+		gift = initGift;
 	};
 
 	const inputClasses = [