add frontend code for selecting/setting the library

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

@@ -0,0 +1,29 @@
+<script lang="ts">
+	import { Command as CommandPrimitive, useId } from 'bits-ui';
+	import { cn } from '$lib/utils.js';
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		children,
+		heading,
+		value,
+		...restProps
+	}: CommandPrimitive.GroupProps & {
+		heading?: string;
+	} = $props();
+</script>
+
+<CommandPrimitive.Group
+	class={cn('overflow-hidden p-1 text-foreground', className)}
+	bind:ref
+	value={value ?? heading ?? `----${useId()}`}
+	{...restProps}
+>
+	{#if heading}
+		<CommandPrimitive.GroupHeading class="px-2 py-1.5 text-xs font-medium text-muted-foreground">
+			{heading}
+		</CommandPrimitive.GroupHeading>
+	{/if}
+	<CommandPrimitive.GroupItems {children} />
+</CommandPrimitive.Group>