fix(feedback): keine doppelte Anzeige von Title + Body

Bei kurzen Posts (oder wenn mana-llm fehlschlug) hat der Auto-Title-
Fallback `feedbackText.slice(0, 80)` den Body 1:1 als Title gespeichert
— Card zeigte dann zwei Mal denselben Text.

Zwei Schichten Schutz:

1. **Server (mana-analytics)**: catch-Branch wirft den Prefix-Fallback
   raus (title bleibt null). Zusätzlich neue isRedundantTitle()-Heuristik
   verwirft auch Auto-Titles, die nur ein truncierter Prefix des Bodies
   sind (Whitespace-collapse + Ellipsis-strip).

2. **Frontend (ItemCard)**: defensive showTitle-Computed — ältere DB-
   Items mit redundantem Title rendern automatisch nur den Body, ohne
   dass eine Datenbank-Cleanup nötig ist.

Title-Slot bleibt für echte Auto-Summaries und manuelle Titel sichtbar.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/mana/apps/web/src/lib/modules/feedback/components/ItemCard.svelte

@@ -30,6 +30,30 @@
 	let tier = $derived(tierFromKarma(item.karma ?? 0));
 	let tierCfg = $derived(KARMA_TIER_CONFIG[tier]);
 
+	// Hide the bold title when it's just a truncated/prefix copy of the
+	// body — pre-rename items have title === feedbackText for short posts.
+	let normalizedTitle = $derived(
+		(item.title ?? '')
+			.toLowerCase()
+			.replace(/[…\.]+$/u, '')
+			.replace(/\s+/g, ' ')
+			.trim()
+	);
+	let normalizedBody = $derived(
+		item.feedbackText
+			.toLowerCase()
+			.replace(/[…\.]+$/u, '')
+			.replace(/\s+/g, ' ')
+			.trim()
+	);
+	let showTitle = $derived(
+		!!item.title &&
+			normalizedTitle.length > 0 &&
+			normalizedTitle !== normalizedBody &&
+			!normalizedBody.startsWith(normalizedTitle) &&
+			!normalizedTitle.startsWith(normalizedBody)
+	);
+
 	function handleClick() {
 		if (onClick) onClick(item.id);
 	}
@@ -72,7 +96,7 @@
 			</span>
 			<span class="muted">{formatDate(item.createdAt)}</span>
 		</div>
-		{#if item.title}
+		{#if showTitle}
 			<h3 class="title">{item.title}</h3>
 		{/if}
 	</header>

services/mana-analytics/src/services/feedback.ts

@@ -129,10 +129,19 @@ export class FeedbackService {
 			try {
 				title = await this.generateTitle(data.feedbackText);
 			} catch {
-				title = data.feedbackText.slice(0, 80);
+				// Don't fall back to a feedbackText prefix — it just duplicates
+				// the body in the UI. Leave title null; the card renders the
+				// text on its own.
+				title = undefined;
 			}
 		}
 
+		// If the auto-titler returned something that's effectively the same
+		// as the body (prefix match modulo whitespace + ellipsis), drop it.
+		if (title && isRedundantTitle(title, data.feedbackText)) {
+			title = undefined;
+		}
+
 		const displayHash = createDisplayHash(userId, this.pseudonymSecret);
 		const displayName = generateDisplayName(displayHash);
 
@@ -141,7 +150,7 @@ export class FeedbackService {
 			.values({
 				userId,
 				appId: data.appId,
-				title: title || data.feedbackText.slice(0, 80),
+				title: title ?? null,
 				feedbackText: data.feedbackText,
 				category: (data.category as any) || 'other',
 				...(typeof data.isPublic === 'boolean' ? { isPublic: data.isPublic } : {}),
@@ -742,6 +751,24 @@ export class FeedbackService {
 	}
 }
 
+/**
+ * True if the title is just a truncated/prefixed version of the body
+ * — i.e. would render twice in the card. Compares whitespace-collapsed
+ * lowercase forms, ignoring trailing ellipsis on either side.
+ */
+function isRedundantTitle(title: string, body: string): boolean {
+	const norm = (s: string) =>
+		s
+			.toLowerCase()
+			.replace(/[…\.]+$/u, '')
+			.replace(/\s+/g, ' ')
+			.trim();
+	const t = norm(title);
+	const b = norm(body);
+	if (!t || !b) return false;
+	return b === t || b.startsWith(t) || t.startsWith(b);
+}
+
 /** Strips userId / displayHash / deviceInfo from a row. */
 function redact(
 	row: FeedbackRow,