simplify combobox event type

src/lib/Combobox.svelte

@@ -9,10 +9,6 @@
 		render?: Snippet<[item: ComboboxItem]>;
 	};
 
-	export type ComboboxChangeEvent = {
-		value: ComboboxItem;
-	};
-
 	const getLabel = (item: ComboboxItem | undefined): string => item?.label ?? item?.value ?? '';
 	const getPreview = (item: ComboboxItem | undefined): string => item?.preview ?? getLabel(item);
 </script>
@@ -45,7 +41,7 @@
 		notFoundMessage?: string;
 		class?: ClassValue | null | undefined;
 		onvalidate?: (e: InputValidatorEvent) => void;
-		onchange?: (e: ComboboxChangeEvent) => void;
+		onchange?: (item: ComboboxItem) => void;
 	}
 
 	let {
@@ -291,7 +287,7 @@
 						value = item;
 						open = false;
 						searchInput?.focus();
-						onchange?.({ value: item });
+						onchange?.(item);
 					}}
 					onkeydown={() => {}}
 					tabindex="-1"
@@ -398,7 +394,7 @@
 				if (e.key === 'Tab' || e.key === 'Enter') {
 					if (open && highlighted && highlighted.value !== value?.value) {
 						value = highlighted;
-						onchange?.({ value: highlighted });
+						onchange?.(highlighted);
 					}
 					if (e.key === 'Enter') {
 						e.preventDefault();