Fix 3 critical bugs: WebView navbar, Android STT, Speaker icon

1. WebView Dashboard Navbar
   - Add `localStorage.setItem('is_mobile', '1')` to hide nav bar
   - Fixes issue where web dashboard shows full navigation

2. Android STT Restart After TTS
   - Reduce delay from 300ms to 50ms for Android
   - Android Audio Focus releases immediately after TTS ends
   - iOS keeps 300ms delay for smooth audio fade
   - File: app/(tabs)/_layout.tsx:208

3. Remove Speaker Icon from Chat Header
   - Remove TTS Stop button (volume-high icon) from chat.tsx
   - Not needed in Lite version
   - File: app/(tabs)/chat.tsx:500-508

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

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

app/(tabs)/_layout.tsx

@@ -203,11 +203,14 @@ export default function TabLayout() {
       }
 
       // Delay to let TTS fully release audio focus, then restart STT
+      // iOS: 300ms for smooth audio fade
+      // Android: 50ms (Audio Focus releases immediately)
+      const delay = Platform.OS === 'android' ? 50 : 300;
       const timer = setTimeout(() => {
         if (sessionActiveRef.current) {
           safeStartSTT();
         }
-      }, 300); // 300ms to ensure TTS audio fully fades
+      }, delay);
       return () => clearTimeout(timer);
     }
 

app/(tabs)/chat.tsx

@@ -497,15 +497,6 @@ export default function ChatScreen() {
             </Text>
           </View>
         </View>
-        {/* TTS Stop button - only visible when speaking */}
-        {isSpeaking && (
-          <TouchableOpacity
-            style={[styles.headerButton, styles.speakingButton]}
-            onPress={stopTTS}
-          >
-            <Ionicons name="volume-high" size={22} color={AppColors.primary} />
-          </TouchableOpacity>
-        )}
         <TouchableOpacity
           style={styles.headerButton}
           onPress={() => setSortNewestFirst(prev => !prev)}

app/(tabs)/index.tsx

@@ -149,6 +149,10 @@ export default function HomeScreen() {
             user_id: ${userId || 'null'}
           };
           localStorage.setItem('auth2', JSON.stringify(authData));
+
+          // Set is_mobile flag to hide navigation bar
+          localStorage.setItem('is_mobile', '1');
+
           console.log('Auth injected:', authData.username);
 
           // Monitor page content for session expired messages