fix: 중국어 TTS → Google Translate TTS로 변경 (고품질 발음)

frontend/src/components/korea/OpsGuideModal.tsx

@@ -143,32 +143,19 @@ export function OpsGuideModal({ ships, onClose, onFlyTo, onRouteSelect }: Props)
     navigator.clipboard.writeText(text).then(() => { setCopiedIdx(idx); setTimeout(() => setCopiedIdx(null), 1500); });
   };
 
+  const audioRef = useRef<HTMLAudioElement | null>(null);
+
   const speakChinese = useCallback((text: string, idx: number) => {
-    if (typeof window === 'undefined' || !window.speechSynthesis) return;
-    window.speechSynthesis.cancel();
-    const utter = new SpeechSynthesisUtterance(text);
-    utter.lang = 'zh-CN';
-    utter.rate = 0.8;
-    utter.pitch = 1.0;
-    utter.volume = 1;
-    const voices = window.speechSynthesis.getVoices();
-    const zhVoice = voices.find(v => v.lang === 'zh-CN') || voices.find(v => v.lang.startsWith('zh'));
-    if (zhVoice) utter.voice = zhVoice;
-    // Chrome bug workaround: pause/resume keepalive to prevent cutoff
-    let keepAlive: ReturnType<typeof setInterval> | null = null;
-    utter.onstart = () => {
-      setSpeakingIdx(idx);
-      keepAlive = setInterval(() => {
-        if (window.speechSynthesis.speaking && !window.speechSynthesis.paused) {
-          window.speechSynthesis.pause();
-          window.speechSynthesis.resume();
-        }
-      }, 5000);
-    };
-    const cleanup = () => { setSpeakingIdx(null); if (keepAlive) clearInterval(keepAlive); };
-    utter.onend = cleanup;
-    utter.onerror = cleanup;
-    window.speechSynthesis.speak(utter);
+    // Stop previous
+    if (audioRef.current) { audioRef.current.pause(); audioRef.current = null; }
+    setSpeakingIdx(idx);
+    const encoded = encodeURIComponent(text);
+    const url = `https://translate.google.com/translate_tts?ie=UTF-8&client=tw-ob&tl=zh-CN&q=${encoded}`;
+    const audio = new Audio(url);
+    audioRef.current = audio;
+    audio.onended = () => setSpeakingIdx(null);
+    audio.onerror = () => setSpeakingIdx(null);
+    audio.play().catch(() => setSpeakingIdx(null));
   }, []);
 
   const handleSuspectClick = (s: SuspectVessel) => {