Fix voice input for iOS Safari and prevent infinite loop

- Remove temperature parameter from GPT-5-mini activity extraction (not supported)
- Add classification state to useVoiceInput hook to avoid duplicate API calls
- Prevent infinite loop in VoiceFloatingButton by tracking lastClassifiedTranscript
- Use classification from backend directly instead of making second request
- iOS Safari now successfully transcribes with Azure Whisper and classifies with GPT-5-mini

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/components/voice/VoiceFloatingButton.tsx

@@ -33,6 +33,7 @@ export function VoiceFloatingButton() {
   const [open, setOpen] = useState(false);
   const [isProcessing, setIsProcessing] = useState(false);
   const [classificationResult, setClassificationResult] = useState<any>(null);
+  const [lastClassifiedTranscript, setLastClassifiedTranscript] = useState<string>('');
   const [snackbar, setSnackbar] = useState<{
     open: boolean;
     message: string;
@@ -43,15 +44,16 @@ export function VoiceFloatingButton() {
     severity: 'info',
   });
 
-  const { isListening, isSupported, transcript, error, startListening, stopListening, reset } =
+  const { isListening, isSupported, transcript, classification, error, startListening, stopListening, reset } =
     useVoiceInput();
 
-  // Auto-classify when we get a final transcript
+  // Auto-use classification from backend when transcription completes
   React.useEffect(() => {
-    if (transcript && !isListening && !isProcessing && open) {
-      classifyTranscript(transcript);
+    if (classification && !isListening && !isProcessing && open) {
+      setClassificationResult(classification);
+      handleClassifiedIntent(classification);
     }
-  }, [transcript, isListening, isProcessing, open]);
+  }, [classification, isListening, isProcessing, open]);
 
   const handleOpen = () => {
     if (!isSupported) {
@@ -65,6 +67,7 @@ export function VoiceFloatingButton() {
     setOpen(true);
     reset();
     setClassificationResult(null);
+    setLastClassifiedTranscript('');
   };
 
   const handleClose = () => {
@@ -74,11 +77,13 @@ export function VoiceFloatingButton() {
     setOpen(false);
     reset();
     setClassificationResult(null);
+    setLastClassifiedTranscript('');
   };
 
   const handleStartListening = () => {
     reset();
     setClassificationResult(null);
+    setLastClassifiedTranscript('');
     startListening();
   };
 
@@ -87,6 +92,8 @@ export function VoiceFloatingButton() {
   };
 
   const classifyTranscript = async (text: string) => {
+    // Mark this transcript as being classified to prevent duplicate calls
+    setLastClassifiedTranscript(text);
     setIsProcessing(true);
     try {
       const response = await fetch('/api/voice/transcribe', {