add frontend code for selecting/setting the library

web/src/lib/components/ui/command/command-item.svelte

@@ -0,0 +1,19 @@
+<script lang="ts">
+	import { Command as CommandPrimitive } from 'bits-ui';
+	import { cn } from '$lib/utils.js';
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		...restProps
+	}: CommandPrimitive.ItemProps = $props();
+</script>
+
+<CommandPrimitive.Item
+	class={cn(
+		'relative flex cursor-default select-none items-center gap-2 rounded-sm px-2 py-1.5 text-sm outline-none aria-selected:bg-accent aria-selected:text-accent-foreground data-[disabled]:pointer-events-none data-[disabled]:opacity-50 [&_svg]:pointer-events-none [&_svg]:size-4 [&_svg]:shrink-0',
+		className
+	)}
+	bind:ref
+	{...restProps}
+/>