Add Skeleton UI component from shadcn

src/lib/components/ui/skeleton/index.ts

@@ -0,0 +1,7 @@
+import Root from "./skeleton.svelte";
+
+export {
+	Root,
+	//
+	Root as Skeleton
+};

src/lib/components/ui/skeleton/skeleton.svelte

@@ -0,0 +1,14 @@
+<script lang="ts">
+	import { cn } from "$lib/utils";
+	import type { HTMLAttributes } from "svelte/elements";
+
+	type $$Props = HTMLAttributes<HTMLDivElement>;
+
+	let className: $$Props["class"] = undefined;
+	export { className as class };
+</script>
+
+<div
+	class={cn("animate-pulse rounded-md bg-primary/10", className)}
+	{...$$restProps}
+/>