Stabilize interim speech capture

client/src/App.tsx

@@ -37,6 +37,7 @@ function App() {
   const isRecordingRef = useRef(false)
   const lastResultAtRef = useRef<number>(Date.now())
   const restartLockRef = useRef(false)
+  const finalizeTimerRef = useRef<number | null>(null)
 
   const hasSpeechRecognition = useMemo(() => {
     return 'SpeechRecognition' in window || 'webkitSpeechRecognition' in window
@@ -117,6 +118,7 @@ function App() {
     recognition.lang = 'ko-KR'
     recognition.interimResults = true
     recognition.continuous = true
+    recognition.maxAlternatives = 3
 
     recognition.onresult = (event) => {
       lastResultAtRef.current = Date.now()
@@ -148,6 +150,13 @@ function App() {
             },
           ]
         })
+        if (finalizeTimerRef.current) {
+          window.clearTimeout(finalizeTimerRef.current)
+        }
+        finalizeTimerRef.current = window.setTimeout(() => {
+          void commitLiveIfAny()
+          finalizeTimerRef.current = null
+        }, 1200)
       }
     }
 
@@ -156,6 +165,10 @@ function App() {
     }
 
     recognition.onend = () => {
+      if (finalizeTimerRef.current) {
+        window.clearTimeout(finalizeTimerRef.current)
+        finalizeTimerRef.current = null
+      }
       void commitLiveIfAny()
       liveTextRef.current = ''
       if (isRecordingRef.current) {
@@ -175,6 +188,10 @@ function App() {
     if (!meetingIdRef.current) return
     const trimmed = text.trim()
     if (!trimmed) return
+    if (finalizeTimerRef.current) {
+      window.clearTimeout(finalizeTimerRef.current)
+      finalizeTimerRef.current = null
+    }
     lastResultAtRef.current = Date.now()
     const ts = new Date().toISOString()
     liveTextRef.current = ''