fix(comments): remove empty state hint from CommentThread

The "Noch keine Kommentare" hint with icon is unnecessary — users
already clicked "Kommentieren" to open the thread, so showing them
an empty state just adds noise. Jump straight to the compose box.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/components/CommentThread.svelte

@@ -301,24 +301,6 @@ onMount(async () => {
 {/snippet}
 
 <div class="space-y-4">
-	{#if comments.length === 0}
-		<div class="flex flex-col items-center gap-3 py-8 text-center">
-			<svg
-				class="h-10 w-10 text-ink-3"
-				viewBox="0 0 24 24"
-				fill="none"
-				stroke="currentColor"
-				stroke-width="1.5"
-			>
-				<path
-					stroke-linecap="round"
-					stroke-linejoin="round"
-					d="M2.25 12.76c0 1.6 1.123 2.994 2.707 3.227 1.087.16 2.185.283 3.293.369V21l4.076-4.076a1.526 1.526 0 0 1 1.037-.443 48.282 48.282 0 0 0 5.68-.494c1.584-.233 2.707-1.626 2.707-3.228V6.741c0-1.602-1.123-2.995-2.707-3.228A48.394 48.394 0 0 0 12 3c-2.392 0-4.744.175-7.043.513C3.373 3.746 2.25 5.14 2.25 6.741v6.018Z"
-				/>
-			</svg>
-			<p class="font-sans text-sm text-ink-3">{m.comment_empty_hint()}</p>
-		</div>
-	{/if}
 	{#each comments as thread, ti (thread.id)}
 		<div class={ti > 0 ? 'border-t border-line pt-4' : ''}>
 			<!-- Root comment -->