fix css references to make suitable for import

src/lib/Spinner.svelte

@@ -1,8 +1,16 @@
 <script lang="ts">
-	let { size }: { size: string } = $props();
+	import type { ClassValue } from 'svelte/elements';
+
+	interface Props {
+		size: string;
+		class?: ClassValue;
+		color?: string;
+	}
+
+	let { size, class: classValue, color = '#fff' }: Props = $props();
 </script>
 
-<div class="lds-ring" style="--size: {size}">
+<div class={['lds-ring border-white', classValue]} style="--size: {size};--color: {color}">
 	<div></div>
 	<div></div>
 	<div></div>