refactor: Remove deprecated code and unused comments

lib/features/chat/views/chat_page.dart

@@ -2242,11 +2242,7 @@ class _ChatPageState extends ConsumerState<ChatPage> {
       isDestructive: true,
     ).then((confirmed) async {
       if (confirmed == true) {
-        // for (final selectedMessage in selectedMessages) {
-        //   ref.read(chatMessagesProvider.notifier).removeMessage(selectedMessage.id);
-        // }
         _clearSelection();
-        if (mounted) {}
       }
     });
   }
@@ -2762,7 +2758,6 @@ class _VoiceInputSheetState extends ConsumerState<_VoiceInputSheet> {
       setState(() {
         _isListening = false;
       });
-      if (mounted) {}
     }
   }
 

lib/features/chat/widgets/assistant_message_widget.dart

@@ -1181,8 +1181,6 @@ class _AssistantMessageWidgetState extends ConsumerState<AssistantMessageWidget>
     );
   }
 
-  // Deprecated: old in-content version switcher replaced by inline controls with action buttons.
-
   Widget _buildActionButtons() {
     final l10n = AppLocalizations.of(context)!;
     final ttsState = ref.watch(textToSpeechControllerProvider);
@@ -2292,62 +2290,6 @@ class CodeExecutionListView extends StatelessWidget {
   }
 }
 
-// Legacy CitationListView - replaced with OpenWebUISourcesWidget
-// Keeping for reference, can be removed after testing
-/*
-class CitationListView extends StatelessWidget {
-  const CitationListView({super.key, required this.sources});
-
-  final List<ChatSourceReference> sources;
-
-  @override
-  Widget build(BuildContext context) {
-    final theme = context.conduitTheme;
-    if (sources.isEmpty) {
-      return const SizedBox.shrink();
-    }
-
-    return Column(
-      crossAxisAlignment: CrossAxisAlignment.start,
-      children: [
-        Text(
-          sources.length == 1 ? 'Source' : 'Sources',
-          style: TextStyle(
-            color: theme.textPrimary,
-            fontWeight: FontWeight.w600,
-            fontSize: AppTypography.bodyLarge,
-          ),
-        ),
-        const SizedBox(height: Spacing.xs),
-        ...sources.map((source) {
-          final title = source.title?.isNotEmpty == true
-              ? source.title!
-              : source.url ?? 'Citation';
-          final subtitle = source.snippet?.isNotEmpty == true
-              ? source.snippet!
-              : source.url;
-
-          return Card(
-            margin: const EdgeInsets.only(bottom: Spacing.xs),
-            color: theme.surfaceContainer,
-            child: ListTile(
-              onTap: source.url != null ? () => _launchUri(source.url!) : null,
-              title: Text(title, style: TextStyle(color: theme.textPrimary)),
-              subtitle: subtitle != null
-                  ? Text(subtitle, style: TextStyle(color: theme.textSecondary))
-                  : null,
-              trailing: source.url != null
-                  ? const Icon(Icons.open_in_new, size: 18)
-                  : null,
-            ),
-          );
-        }),
-      ],
-    );
-  }
-}
-*/
-
 class FollowUpSuggestionBar extends StatelessWidget {
   const FollowUpSuggestionBar({
     super.key,

lib/features/chat/widgets/modern_chat_input.dart

@@ -102,12 +102,9 @@ class _ModernChatInputState extends ConsumerState<ModernChatInput>
   final FocusNode _focusNode = FocusNode();
   bool _pendingFocus = false;
   bool _isRecording = false;
-  // final String _voiceInputText = '';
   bool _hasText = false; // track locally without rebuilding on each keystroke
   StreamSubscription<String>? _voiceStreamSubscription;
   late VoiceInputService _voiceService;
-  StreamSubscription<int>?
-  _intensitySub; // removed usage; will be cleaned fully
   StreamSubscription<String>? _textSub;
   String _baseTextAtStart = '';
   bool _isDeactivated = false;
@@ -167,7 +164,6 @@ class _ModernChatInputState extends ConsumerState<ModernChatInput>
     _focusNode.dispose();
     _pendingFocus = false;
     _voiceStreamSubscription?.cancel();
-    _intensitySub?.cancel();
     _textSub?.cancel();
     _voiceService.stopListening();
     super.dispose();
@@ -2949,8 +2945,6 @@ class _ModernChatInputState extends ConsumerState<ModernChatInput>
         _isRecording = true;
         _baseTextAtStart = _controller.text;
       });
-      _intensitySub?.cancel();
-      // intensity stream no longer used for UI; stop listening
       _textSub?.cancel();
       _textSub = stream.listen(
         (text) async {
@@ -2965,14 +2959,10 @@ class _ModernChatInputState extends ConsumerState<ModernChatInput>
         onDone: () {
           if (!mounted) return;
           setState(() => _isRecording = false);
-          _intensitySub?.cancel();
-          _intensitySub = null;
         },
         onError: (_) {
           if (!mounted) return;
           setState(() => _isRecording = false);
-          _intensitySub?.cancel();
-          _intensitySub = null;
         },
       );
       _ensureFocusedIfEnabled();
@@ -2987,8 +2977,6 @@ class _ModernChatInputState extends ConsumerState<ModernChatInput>
   }
 
   Future<void> _stopVoice() async {
-    _intensitySub?.cancel();
-    _intensitySub = null;
     await _voiceService.stopListening();
     if (!mounted) return;
     setState(() => _isRecording = false);