fix(transcription): auto-capture quote on text selection, smart comment button

- Quote captured automatically on mouseup in textarea (no button needed)
  Selection is held in state and pre-fills the comment input
- "Kommentieren" button only shown when zero comments exist
  When comments are present, the input is already visible — button is noise
- Chat bubble icon added to Kommentieren button for visual consistency

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

frontend/src/lib/components/TranscriptionBlock.svelte

@@ -36,9 +36,12 @@ let {
 
 let localText = $state(text);
 let commentOpen = $state(false);
+let commentCount = $state(0);
 let selectedQuote = $state<string | null>(null);
 let textareaEl = $state<HTMLTextAreaElement | null>(null);
 
+const hasComments = $derived(commentCount > 0);
+
 // Sync from prop only when switching to a different block (not on save responses)
 let prevBlockId = $state(blockId);
 $effect(() => {
@@ -83,17 +86,15 @@ function handleDelete() {
 	}
 }
 
-function captureSelectionAndOpenComments() {
-	if (textareaEl) {
-		const start = textareaEl.selectionStart;
-		const end = textareaEl.selectionEnd;
-		if (start !== end) {
-			selectedQuote = localText.substring(start, end);
-		} else {
-			selectedQuote = null;
-		}
+function handleTextareaMouseUp() {
+	if (!textareaEl) return;
+	const start = textareaEl.selectionStart;
+	const end = textareaEl.selectionEnd;
+	if (start !== end) {
+		selectedQuote = localText.substring(start, end);
+	} else {
+		selectedQuote = null;
 	}
-	commentOpen = true;
 }
 </script>
 
@@ -126,22 +127,33 @@ function captureSelectionAndOpenComments() {
 			value={localText}
 			oninput={handleInput}
 			onfocus={onFocus}
+			onmouseup={handleTextareaMouseUp}
 		></textarea>
 
 		<!-- Footer -->
 		<div class="flex items-center justify-between border-t border-line pt-2">
-			<div class="flex flex-col gap-1">
-				<button
-					type="button"
-					class="text-xs font-medium text-ink-2 transition-colors hover:text-ink"
-					onclick={captureSelectionAndOpenComments}
-				>
-					{m.transcription_block_comment_btn()}
-				</button>
-				{#if active}
-					<span class="text-xs text-ink-3">
-						{m.transcription_block_quote_hint()}
-					</span>
+			<div>
+				{#if !hasComments}
+					<button
+						type="button"
+						class="flex items-center gap-1 text-xs font-medium text-ink-2 transition-colors hover:text-ink"
+						onclick={() => (commentOpen = true)}
+					>
+						<svg
+							class="h-3 w-3"
+							viewBox="0 0 24 24"
+							fill="none"
+							stroke="currentColor"
+							stroke-width="2"
+						>
+							<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 0 011.037-.443 48.282 48.282 0 005.68-.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 0012 3c-2.392 0-4.744.175-7.043.513C3.373 3.746 2.25 5.14 2.25 6.741v6.018z"
+							/>
+						</svg>
+						{m.transcription_block_comment_btn()}
+					</button>
 				{/if}
 			</div>
 
@@ -204,6 +216,7 @@ function captureSelectionAndOpenComments() {
 				canComment={canComment}
 				quotedText={selectedQuote}
 				showCompose={commentOpen}
+				onCountChange={(count) => (commentCount = count)}
 			/>
 		</div>
 	</div>

frontend/src/lib/components/TranscriptionBlock.svelte.spec.ts

@@ -114,20 +114,9 @@ describe('TranscriptionBlock — interactions', () => {
 		expect(onFocus).toHaveBeenCalled();
 	});
 
-	it('shows Kommentieren button that opens comment thread', async () => {
+	it('shows Kommentieren button when no comments exist', async () => {
 		renderBlock();
 		const btn = page.getByText('Kommentieren');
 		await expect.element(btn).toBeInTheDocument();
 	});
-
-	it('shows quote hint when block is active', async () => {
-		renderBlock({ active: true });
-		await expect.element(page.getByText('Text markieren für Zitat')).toBeInTheDocument();
-	});
-
-	it('hides quote hint when block is not active', async () => {
-		renderBlock({ active: false });
-		const hint = page.getByText('Text markieren für Zitat');
-		await expect.element(hint).not.toBeInTheDocument();
-	});
 });