fix: Voice-Stop greift hart durch + Schriftgroesse wirkt jetzt im Chat [appimage]

Voice-Stop:
- TTS-Audio jetzt vollstaendig zerstoert (pause + src='' + load) statt nur pause
- Wartende speakAndWait()-Promise wird beim Stop aufgeloest (vorher Hang)
- isActive()-Check direkt nach text_to_speech Result, kein Audio-Start mehr nach Stop

Schriftgroesse:
- .content hatte feste 13.5px → ueberschrieb --chat-font-size
- Headings (h1-h3) hatten feste px-Werte → jetzt em (relativ zu User-Schrift)

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

src/lib/components/Message.svelte

@@ -294,8 +294,7 @@
 	}
 
 	.content {
-		font-size: 13.5px;
-		line-height: 1.55;
+		/* Schrift wird von .msg geerbt (User-konfigurierbar) */
 		word-wrap: break-word;
 	}
 	.content.faint { color: var(--vscode-descriptionForeground); }
@@ -308,9 +307,9 @@
 		margin: 10px 0 4px 0;
 		font-weight: 600;
 	}
-	.content :global(h1) { font-size: 16px; }
-	.content :global(h2) { font-size: 14.5px; }
-	.content :global(h3) { font-size: 13.5px; }
+	.content :global(h1) { font-size: 1.25em; }
+	.content :global(h2) { font-size: 1.13em; }
+	.content :global(h3) { font-size: 1.05em; }
 	.content :global(.code-block-wrapper) {
 		background: var(--vscode-terminal-background);
 		border: 1px solid var(--vscode-input-border);

src/lib/voice/conversationEngine.ts

@@ -43,6 +43,7 @@ let audioChunks: Blob[] = [];
 let analyser: AnalyserNode | null = null;
 let animationFrame: number | null = null;
 let ttsAudio: HTMLAudioElement | null = null;
+let ttsResolve: (() => void) | null = null;
 
 // VAD
 const SILENCE_THRESHOLD = 0.03;
@@ -299,13 +300,28 @@ async function speakAndWait(text: string): Promise<void> {
 	try {
 		const voice = get(chatAppearance).ttsVoice || null;
 		const audioBase64: string = await invoke('text_to_speech', { text, voice });
+		// Falls in der Zwischenzeit gestoppt wurde — kein Audio mehr starten
+		if (!isActive()) return;
 		return new Promise((resolve) => {
+			let resolved = false;
+			const finish = () => {
+				if (resolved) return;
+				resolved = true;
+				if (ttsAudio) {
+					ttsAudio.pause();
+					ttsAudio.src = '';
+					try { ttsAudio.load(); } catch { /* ignore */ }
+					ttsAudio = null;
+				}
+				resolve();
+			};
+			ttsResolve = finish;
 			if (ttsAudio) { ttsAudio.pause(); ttsAudio = null; }
 			ttsAudio = new Audio(`data:audio/wav;base64,${audioBase64}`);
-			ttsAudio.onended = () => { ttsAudio = null; resolve(); };
-			ttsAudio.onerror = () => { ttsAudio = null; resolve(); };
-			ttsAudio.play().catch(() => resolve());
-			monitorInterrupt(resolve);
+			ttsAudio.onended = finish;
+			ttsAudio.onerror = finish;
+			ttsAudio.play().catch(finish);
+			monitorInterrupt(finish);
 		});
 	} catch (err) {
 		console.error('TTS fehlgeschlagen:', err);
@@ -337,10 +353,20 @@ function monitorInterrupt(onInterrupt: () => void) {
 
 function stopSpeaking() {
 	if (ttsAudio) {
+		try {
 			ttsAudio.pause();
 			ttsAudio.currentTime = 0;
+			ttsAudio.src = '';
+			ttsAudio.load();
+		} catch { /* ignore */ }
 		ttsAudio = null;
 	}
+	// Wartendes speakAndWait()-Promise sofort aufloesen
+	if (ttsResolve) {
+		const r = ttsResolve;
+		ttsResolve = null;
+		try { r(); } catch { /* ignore */ }
+	}
 }
 
 // Helpers -------------------------------------------------------------------