Working sorting!

frontend/src/lib/ThSort.svelte

@@ -0,0 +1,23 @@
+<script lang="ts">
+	import type { DataHandler } from '@vincjo/datatables';
+
+	export let handler: DataHandler;
+	export let orderBy: string;
+
+	const sorted = handler.getSort();
+</script>
+
+<th on:click={() => handler.sort(orderBy)} class="cursor-pointer select-none">
+	<div class="flex h-full items-center justify-start gap-x-2">
+		<slot />
+		{#if $sorted.identifier === orderBy}
+			{#if $sorted.direction === 'asc'}
+				&darr;
+			{:else if $sorted.direction === 'desc'}
+				&uarr;
+			{/if}
+		{:else}
+			&updownarrow;
+		{/if}
+	</div>
+</th>