fix ui package, use sv to create

recreated package using sv, marking correctly as a library. seems I was
missing some sveltekit tooling somewhere along the way otherwise.

src/lib/Label.svelte

@@ -0,0 +1,23 @@
+<script lang="ts">
+	import type { Snippet } from 'svelte';
+
+	let {
+		for: target,
+		error,
+		bigError,
+		children
+	}: { for: string; error?: boolean; bigError?: boolean; children: Snippet } = $props();
+</script>
+
+<label
+	for={target}
+	class={[
+		'transition-fontColor block',
+		error && !bigError
+			? 'mt-1 text-sm font-normal text-red-500'
+			: 'text-text dark:text-background mb-3 text-base font-medium',
+		bigError && 'text-red-500!'
+	]}
+>
+	{@render children()}
+</label>