add frontend code for selecting/setting the library

web/src/lib/components/ui/popover/index.ts

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+import { Popover as PopoverPrimitive } from 'bits-ui';
+import Content from './popover-content.svelte';
+const Root = PopoverPrimitive.Root;
+const Trigger = PopoverPrimitive.Trigger;
+const Close = PopoverPrimitive.Close;
+
+export {
+	Root,
+	Content,
+	Trigger,
+	Close,
+	//
+	Root as Popover,
+	Content as PopoverContent,
+	Trigger as PopoverTrigger,
+	Close as PopoverClose
+};

web/src/lib/components/ui/popover/popover-content.svelte

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+<script lang="ts">
+	import { cn } from '$lib/utils.js';
+	import { Popover as PopoverPrimitive } from 'bits-ui';
+
+	let {
+		ref = $bindable(null),
+		class: className,
+		align = 'center',
+		sideOffset = 4,
+		portalProps,
+		...restProps
+	}: PopoverPrimitive.ContentProps & {
+		portalProps?: PopoverPrimitive.PortalProps;
+	} = $props();
+</script>
+
+<PopoverPrimitive.Portal {...portalProps}>
+	<PopoverPrimitive.Content
+		bind:ref
+		{align}
+		{sideOffset}
+		class={cn(
+			'z-50 w-72 rounded-md border bg-popover p-4 text-popover-foreground shadow-md outline-none data-[state=open]:animate-in data-[state=closed]:animate-out data-[state=closed]:fade-out-0 data-[state=open]:fade-in-0 data-[state=closed]:zoom-out-95 data-[state=open]:zoom-in-95 data-[side=bottom]:slide-in-from-top-2 data-[side=left]:slide-in-from-right-2 data-[side=right]:slide-in-from-left-2 data-[side=top]:slide-in-from-bottom-2',
+			className
+		)}
+		{...restProps}
+	/>
+</PopoverPrimitive.Portal>