Add red pulsing animation to VoiceFAB when listening

- Add pulse ring that expands and fades out while in listening mode
- Animation uses native driver for smooth 60fps performance
- Ring starts at FAB size and scales to 1.8x with opacity fade

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

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

components/VoiceFAB.tsx

@@ -35,6 +35,8 @@ export function VoiceFAB({ onPress, style, disabled = false, isListening = false
   // Animation values
   const scale = useRef(new Animated.Value(1)).current;
   const opacity = useRef(new Animated.Value(1)).current;
+  const pulseScale = useRef(new Animated.Value(1)).current;
+  const pulseOpacity = useRef(new Animated.Value(0)).current;
 
   // Hide FAB when call is active
   useEffect(() => {
@@ -68,6 +70,51 @@ export function VoiceFAB({ onPress, style, disabled = false, isListening = false
     }
   }, [isCallActive, scale, opacity]);
 
+  // Pulse animation when listening
+  useEffect(() => {
+    if (isListening && !isCallActive) {
+      // Start pulsing animation
+      const pulseAnimation = Animated.loop(
+        Animated.sequence([
+          Animated.parallel([
+            Animated.timing(pulseScale, {
+              toValue: 1.8,
+              duration: 1000,
+              useNativeDriver: true,
+            }),
+            Animated.timing(pulseOpacity, {
+              toValue: 0,
+              duration: 1000,
+              useNativeDriver: true,
+            }),
+          ]),
+          Animated.parallel([
+            Animated.timing(pulseScale, {
+              toValue: 1,
+              duration: 0,
+              useNativeDriver: true,
+            }),
+            Animated.timing(pulseOpacity, {
+              toValue: 0.6,
+              duration: 0,
+              useNativeDriver: true,
+            }),
+          ]),
+        ])
+      );
+      pulseAnimation.start();
+
+      return () => {
+        pulseAnimation.stop();
+        pulseScale.setValue(1);
+        pulseOpacity.setValue(0);
+      };
+    } else {
+      pulseScale.setValue(1);
+      pulseOpacity.setValue(0);
+    }
+  }, [isListening, isCallActive, pulseScale, pulseOpacity]);
+
   // Press animation with haptic feedback
   const handlePressIn = () => {
     Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Medium);
@@ -103,6 +150,18 @@ export function VoiceFAB({ onPress, style, disabled = false, isListening = false
         style,
       ]}
     >
+      {/* Pulse ring when listening */}
+      {isListening && (
+        <Animated.View
+          style={[
+            styles.pulseRing,
+            {
+              transform: [{ scale: pulseScale }],
+              opacity: pulseOpacity,
+            },
+          ]}
+        />
+      )}
       <TouchableOpacity
         style={[
           styles.fab,
@@ -133,6 +192,13 @@ const styles = StyleSheet.create({
     alignItems: 'center',
     zIndex: 100,
   },
+  pulseRing: {
+    position: 'absolute',
+    width: FAB_SIZE,
+    height: FAB_SIZE,
+    borderRadius: BorderRadius.full,
+    backgroundColor: AppColors.error,
+  },
   fab: {
     width: FAB_SIZE,
     height: FAB_SIZE,