Fix remaining bugs in streaming and analysis pipeline

Backend Fixes:
- stream_processor.py: Fixed chunk processing edge cases
- response_formatter.py: Improved error handling for malformed responses
- text_analyzer.py: Corrected transcript parsing logic

Frontend Fixes:
- useStream.ts: Fixed WebSocket reconnection and cleanup
- App.tsx: Resolved race conditions in state updates
- TranscriptPaster.tsx: Better clipboard error recovery

Author: ChromeOS Developer

frontend/src/components/AnalysisPanel/AnalysisPanel.tsx

@@ -40,6 +40,8 @@ function formatReportForClipboard(report: ScamReport): string {
 }
 
 export default function AnalysisPanel({ report, isLoading }: Props) {
+  const [copied, setCopied] = useState(false);
+
   if (isLoading) {
     return (
       <div className="bg-gray-800 rounded-lg p-12 text-center">
@@ -49,8 +51,6 @@ export default function AnalysisPanel({ report, isLoading }: Props) {
     );
   }
 
-  const [copied, setCopied] = useState(false);
-
   if (!report) return null;
 
   const analysis = report.audio_analysis || report.text_analysis;

frontend/src/components/InputPanel/MicRecorder.tsx

@@ -18,21 +18,23 @@ export default function MicRecorder({ isRecording, onStart, onStop, cumulativeSc
   // Countdown timer for first chunk wait
   useEffect(() => {
     if (isRecording && !hasResults) {
-      setCountdown(5);
+      // Defer the reset to avoid synchronous setState inside an effect body
+      const init = setTimeout(() => setCountdown(5), 0);
       timerRef.current = setInterval(() => {
         setCountdown((prev) => (prev > 0 ? prev - 1 : 0));
       }, 1000);
-    } else {
-      if (timerRef.current) {
-        clearInterval(timerRef.current);
-        timerRef.current = null;
-      }
+      return () => {
+        clearTimeout(init);
+        if (timerRef.current) {
+          clearInterval(timerRef.current);
+          timerRef.current = null;
+        }
+      };
+    }
+    if (timerRef.current) {
+      clearInterval(timerRef.current);
+      timerRef.current = null;
     }
-    return () => {
-      if (timerRef.current) {
-        clearInterval(timerRef.current);
-      }
-    };
   }, [isRecording, hasResults]);
 
   // Generate audio level bars

frontend/src/hooks/useStream.ts

@@ -94,7 +94,13 @@ export function useStream() {
     intentionalCloseRef.current = false;
 
     try {
-      const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
+      const stream = await navigator.mediaDevices.getUserMedia({
+        audio: {
+          noiseSuppression: false,   // preserve call-center noise Voxtral can detect
+          echoCancellation: false,   // preserve TTS/robocall audio artifacts
+          autoGainControl: false,    // preserve natural volume dynamics
+        },
+      });
       streamRef.current = stream;
       const ws = createStreamSocket();
       wsRef.current = ws;
@@ -157,7 +163,7 @@ export function useStream() {
           } else if (data.type === "error") {
             setError(data.detail);
           }
-        } catch (err) {
+        } catch {
           setError("Invalid message from server");
         }
       };