feat: 长辈模式（大字大按钮 + 偏好按账号隔离）+ 语音输入（按住说话 + 实时转写 + 后端代理 DashScope ASR + 患者端专用）+ 健康仪表盘背景渐变

health_app/lib/pages/home/home_page.dart

@@ -7,11 +7,15 @@ import 'package:file_picker/file_picker.dart';
 import 'package:shadcn_ui/shadcn_ui.dart';
 import '../../core/app_colors.dart';
 import '../../core/app_design_tokens.dart';
+import '../../core/elder_mode_scope.dart';
 import '../../core/app_module_visuals.dart';
 import '../../core/navigation_provider.dart';
 import '../../providers/auth_provider.dart';
 import '../../providers/chat_provider.dart';
 import '../../providers/data_providers.dart';
+import '../../providers/elder_mode_provider.dart';
+import '../../services/realtime_speech_service.dart';
+import '../../widgets/app_toast.dart';
 import '../../widgets/health_drawer.dart';
 import '../../widgets/keyboard_lift.dart';
 import '../diet/diet_capture_page.dart';
@@ -32,6 +36,15 @@ class _HomePageState extends ConsumerState<HomePage>
   String? _pickedImagePath;
   Timer? _notificationTimer;
   double _conversationDragDistance = 0;
+  bool _voiceMode = false;
+  _SpeechPhase _speechPhase = _SpeechPhase.idle;
+  RealtimeSpeechSession? _speechSession;
+  StreamSubscription<SpeechRecognitionEvent>? _speechEventSubscription;
+  String _speechText = '';
+  bool _voicePressActive = false;
+  bool _cancelVoiceOnRelease = false;
+  bool _finishVoiceWhenReady = false;
+  double? _voicePressStartY;
 
   void _startConversationDrawerDrag(DragStartDetails details) {
     _conversationDragDistance = 0;
@@ -55,6 +68,8 @@ class _HomePageState extends ConsumerState<HomePage>
   @override
   void initState() {
     super.initState();
+    final elderPreferences = ref.read(elderModeProvider).preferences;
+    _voiceMode = elderPreferences.enabled && elderPreferences.voiceInputEnabled;
     WidgetsBinding.instance.addObserver(this);
     _scheduleScrollToLatest();
     WidgetsBinding.instance.addPostFrameCallback((_) {
@@ -72,6 +87,10 @@ class _HomePageState extends ConsumerState<HomePage>
     if (state == AppLifecycleState.resumed) {
       _checkDueNotifications();
     }
+    if (state == AppLifecycleState.paused &&
+        _speechPhase != _SpeechPhase.idle) {
+      unawaited(_cancelVoiceRecording());
+    }
   }
 
   @override
@@ -81,6 +100,8 @@ class _HomePageState extends ConsumerState<HomePage>
     _textCtrl.dispose();
     _scrollCtrl.dispose();
     _focusNode.dispose();
+    unawaited(_speechEventSubscription?.cancel());
+    unawaited(_speechSession?.cancel());
     super.dispose();
   }
 
@@ -124,6 +145,19 @@ class _HomePageState extends ConsumerState<HomePage>
     final auth = ref.watch(authProvider);
     final user = auth.user;
 
+    ref.listen<bool>(
+      elderModeProvider.select(
+        (state) => state.isEnabled && state.preferences.voiceInputEnabled,
+      ),
+      (previous, current) {
+        if (previous == current || !mounted) return;
+        if (_speechPhase != _SpeechPhase.idle) {
+          unawaited(_cancelVoiceRecording());
+        }
+        setState(() => _voiceMode = current);
+      },
+    );
+
     ref.listen(cameraActionProvider, (prev, next) {
       if (next == 'camera') {
         _pickImage(ImageSource.camera);
@@ -202,12 +236,13 @@ class _HomePageState extends ConsumerState<HomePage>
   }
 
   Widget _buildHeader(dynamic user) {
+    final elderMode = ElderModeScope.enabledOf(context);
     final name = (user?.name != null && user!.name!.isNotEmpty)
         ? user.name
         : '用户';
     final unreadCount = ref.watch(notificationUnreadCountProvider).value ?? 0;
     return Container(
-      padding: const EdgeInsets.fromLTRB(14, 8, 14, 6),
+      padding: EdgeInsets.fromLTRB(14, elderMode ? 10 : 8, 14, 6),
       child: Row(
         children: [
           Builder(
@@ -234,8 +269,8 @@ class _HomePageState extends ConsumerState<HomePage>
                 const SizedBox(height: 2),
                 Text(
                   '${_getGreeting()}，$name',
-                  style: const TextStyle(
-                    fontSize: 18,
+                  style: TextStyle(
+                    fontSize: elderMode ? 20 : 18,
                     fontWeight: FontWeight.w600,
                     color: AppColors.textPrimary,
                   ),
@@ -271,11 +306,12 @@ class _HomePageState extends ConsumerState<HomePage>
   ];
 
   Widget _buildAgentBar() {
+    final elderMode = ElderModeScope.enabledOf(context);
     final activeAgent = ref.watch(
       chatProvider.select((state) => state.activeAgent),
     );
     return SizedBox(
-      height: 46,
+      height: elderMode ? 58 : 46,
       child: ListView.separated(
         scrollDirection: Axis.horizontal,
         padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 2),
@@ -297,9 +333,9 @@ class _HomePageState extends ConsumerState<HomePage>
               ),
               padding: const EdgeInsets.all(1.2),
               child: Container(
-                padding: const EdgeInsets.symmetric(
-                  horizontal: 11.8,
-                  vertical: 7.8,
+                padding: EdgeInsets.symmetric(
+                  horizontal: elderMode ? 15 : 11.8,
+                  vertical: elderMode ? 10 : 7.8,
                 ),
                 decoration: BoxDecoration(
                   color: Colors.white,
@@ -309,23 +345,23 @@ class _HomePageState extends ConsumerState<HomePage>
                   mainAxisSize: MainAxisSize.min,
                   children: [
                     Container(
-                      width: 18,
-                      height: 18,
+                      width: elderMode ? 24 : 18,
+                      height: elderMode ? 24 : 18,
                       decoration: BoxDecoration(
                         gradient: visual.gradient,
                         borderRadius: BorderRadius.circular(6),
                       ),
                       child: Icon(
                         visual.icon,
-                        size: 13,
+                        size: elderMode ? 17 : 13,
                         color: visual.iconColor,
                       ),
                     ),
                     const SizedBox(width: 6),
                     Text(
                       visual.label,
-                      style: const TextStyle(
-                        fontSize: 15,
+                      style: TextStyle(
+                        fontSize: elderMode ? 17 : 15,
                         fontWeight: FontWeight.w700,
                         color: AppColors.textPrimary,
                       ),
@@ -438,98 +474,315 @@ class _HomePageState extends ConsumerState<HomePage>
   }
 
   Widget _buildInputBar() {
+    final elderMode = ElderModeScope.enabledOf(context);
     final isStreaming = ref.watch(
       chatProvider.select((state) => state.isStreaming),
     );
     return Padding(
       padding: const EdgeInsets.fromLTRB(12, 0, 12, 10),
       child: Container(
-        padding: const EdgeInsets.fromLTRB(6, 5, 6, 5),
+        padding: EdgeInsets.fromLTRB(
+          6,
+          elderMode ? 7 : 5,
+          6,
+          elderMode ? 7 : 5,
+        ),
         decoration: BoxDecoration(
           color: Colors.white,
           borderRadius: AppRadius.pillBorder,
         ),
         child: Row(
           crossAxisAlignment: CrossAxisAlignment.center,
-          children: [
-            Material(
-              color: Colors.transparent,
-              child: InkWell(
-                customBorder: const CircleBorder(),
-                onTap: () => _showAttachmentPicker(context),
-                child: Ink(
-                  width: 38,
-                  height: 38,
-                  decoration: const BoxDecoration(
-                    gradient: AppColors.primaryGradient,
-                    shape: BoxShape.circle,
-                  ),
-                  child: const Icon(
-                    LucideIcons.plus,
-                    size: 21,
-                    color: Colors.white,
-                  ),
-                ),
-              ),
-            ),
-            const SizedBox(width: 6),
-            Expanded(
-              child: ConstrainedBox(
-                constraints: const BoxConstraints(maxHeight: 112),
-                child: TextField(
-                  controller: _textCtrl,
-                  focusNode: _focusNode,
-                  style: const TextStyle(
-                    fontSize: 15,
-                    color: AppColors.textPrimary,
-                  ),
-                  maxLines: null,
-                  textInputAction: TextInputAction.newline,
-                  decoration: const InputDecoration(
-                    hintText: '输入你想说的...',
-                    filled: false,
-                    isDense: true,
-                    contentPadding: EdgeInsets.symmetric(
-                      horizontal: 4,
-                      vertical: 12,
-                    ),
-                    border: InputBorder.none,
-                    enabledBorder: InputBorder.none,
-                    focusedBorder: InputBorder.none,
-                  ),
-                  onSubmitted: (_) => _sendMessage(),
-                ),
-              ),
-            ),
-            const SizedBox(width: 6),
-            Material(
-              color: Colors.transparent,
-              child: InkWell(
-                customBorder: const CircleBorder(),
-                onTap: isStreaming
-                    ? () => ref.read(chatProvider.notifier).stopGenerating()
-                    : _sendMessage,
-                child: Ink(
-                  width: 38,
-                  height: 38,
-                  decoration: const BoxDecoration(
-                    gradient: AppColors.primaryGradient,
-                    shape: BoxShape.circle,
-                  ),
-                  child: Icon(
-                    isStreaming ? Icons.stop_rounded : LucideIcons.send,
-                    size: 18,
-                    color: Colors.white,
-                  ),
-                ),
-              ),
-            ),
-          ],
+          children: _voiceMode
+              ? _buildVoiceInputContents(elderMode, isStreaming)
+              : _buildTextInputContents(elderMode, isStreaming),
         ),
       ),
     );
   }
 
+  List<Widget> _buildTextInputContents(bool elderMode, bool isStreaming) {
+    return [
+      _InputCircleButton(
+        icon: LucideIcons.plus,
+        elderMode: elderMode,
+        gradient: AppColors.primaryGradient,
+        iconColor: Colors.white,
+        onTap: () => _showAttachmentPicker(context),
+      ),
+      const SizedBox(width: 6),
+      Expanded(
+        child: ConstrainedBox(
+          constraints: const BoxConstraints(maxHeight: 112),
+          child: TextField(
+            controller: _textCtrl,
+            focusNode: _focusNode,
+            style: TextStyle(
+              fontSize: elderMode ? 18 : 15,
+              color: AppColors.textPrimary,
+            ),
+            maxLines: null,
+            textInputAction: TextInputAction.newline,
+            decoration: InputDecoration(
+              hintText: '输入你想说的...',
+              filled: false,
+              isDense: true,
+              contentPadding: EdgeInsets.symmetric(
+                horizontal: 4,
+                vertical: elderMode ? 15 : 12,
+              ),
+              border: InputBorder.none,
+              enabledBorder: InputBorder.none,
+              focusedBorder: InputBorder.none,
+            ),
+            onSubmitted: (_) => _sendMessage(),
+          ),
+        ),
+      ),
+      const SizedBox(width: 4),
+      _InputCircleButton(
+        icon: LucideIcons.mic,
+        elderMode: elderMode,
+        gradient: AppColors.primaryGradient,
+        iconColor: Colors.white,
+        onTap: isStreaming ? null : _switchToVoiceMode,
+      ),
+      const SizedBox(width: 4),
+      _InputCircleButton(
+        icon: isStreaming ? Icons.stop_rounded : LucideIcons.send,
+        elderMode: elderMode,
+        gradient: AppColors.primaryGradient,
+        iconColor: Colors.white,
+        onTap: isStreaming
+            ? () => ref.read(chatProvider.notifier).stopGenerating()
+            : _sendMessage,
+      ),
+    ];
+  }
+
+  List<Widget> _buildVoiceInputContents(bool elderMode, bool isStreaming) {
+    return [
+      _InputCircleButton(
+        icon: LucideIcons.plus,
+        elderMode: elderMode,
+        gradient: AppColors.primaryGradient,
+        iconColor: Colors.white,
+        onTap: _speechPhase == _SpeechPhase.idle
+            ? () => _showAttachmentPicker(context)
+            : null,
+      ),
+      const SizedBox(width: 6),
+      Expanded(
+        child: isStreaming
+            ? InkWell(
+                onTap: () => ref.read(chatProvider.notifier).stopGenerating(),
+                borderRadius: AppRadius.pillBorder,
+                child: _VoiceHoldSurface(
+                  elderMode: elderMode,
+                  label: '停止生成',
+                  color: AppColors.primary,
+                ),
+              )
+            : Listener(
+                behavior: HitTestBehavior.opaque,
+                onPointerDown: _onVoicePointerDown,
+                onPointerMove: _onVoicePointerMove,
+                onPointerUp: _onVoicePointerUp,
+                onPointerCancel: _onVoicePointerCancel,
+                child: _VoiceHoldSurface(
+                  elderMode: elderMode,
+                  label: _voiceInputLabel,
+                  color: _voiceLabelColor,
+                ),
+              ),
+      ),
+      const SizedBox(width: 4),
+      _InputCircleButton(
+        icon: LucideIcons.keyboard,
+        elderMode: elderMode,
+        gradient: AppColors.primaryGradient,
+        iconColor: Colors.white,
+        onTap: _speechPhase == _SpeechPhase.idle ? _switchToTextMode : null,
+      ),
+    ];
+  }
+
+  String get _voiceInputLabel {
+    if (_cancelVoiceOnRelease) return '松开取消';
+    return switch (_speechPhase) {
+      _SpeechPhase.connecting => '正在连接…',
+      _SpeechPhase.listening =>
+        _speechText.trim().isEmpty ? '松开发送' : _speechText.trim(),
+      _SpeechPhase.finishing => '正在识别…',
+      _SpeechPhase.idle => '按住说话',
+    };
+  }
+
+  Color get _voiceLabelColor {
+    if (_cancelVoiceOnRelease) return AppColors.error;
+    if (_speechPhase == _SpeechPhase.listening ||
+        _speechPhase == _SpeechPhase.connecting ||
+        _speechPhase == _SpeechPhase.finishing) {
+      return AppColors.primary;
+    }
+    return AppColors.textSecondary;
+  }
+
+  Future<void> _switchToVoiceMode() async {
+    _dismissKeyboard();
+    final allowed = await ref
+        .read(realtimeSpeechServiceProvider)
+        .requestPermission();
+    if (!mounted) return;
+    if (!allowed) {
+      AppToast.show(context, '需要麦克风权限才能使用语音输入', type: AppToastType.error);
+      return;
+    }
+    setState(() => _voiceMode = true);
+  }
+
+  void _switchToTextMode() {
+    if (_speechPhase != _SpeechPhase.idle) return;
+    setState(() => _voiceMode = false);
+  }
+
+  void _onVoicePointerDown(PointerDownEvent event) {
+    if (_speechPhase != _SpeechPhase.idle) return;
+    _voicePressActive = true;
+    _cancelVoiceOnRelease = false;
+    _finishVoiceWhenReady = false;
+    _voicePressStartY = event.position.dy;
+    unawaited(_startVoiceRecording());
+  }
+
+  void _onVoicePointerMove(PointerMoveEvent event) {
+    if (!_voicePressActive || _voicePressStartY == null) return;
+    final shouldCancel = _voicePressStartY! - event.position.dy >= 60;
+    if (shouldCancel != _cancelVoiceOnRelease && mounted) {
+      setState(() => _cancelVoiceOnRelease = shouldCancel);
+    }
+  }
+
+  void _onVoicePointerUp(PointerUpEvent event) {
+    if (!_voicePressActive) return;
+    _voicePressActive = false;
+    if (_speechPhase == _SpeechPhase.connecting) {
+      _finishVoiceWhenReady = true;
+      return;
+    }
+    if (_cancelVoiceOnRelease) {
+      unawaited(_cancelVoiceRecording());
+    } else if (_speechPhase == _SpeechPhase.listening) {
+      unawaited(_finishVoiceRecording());
+    }
+  }
+
+  void _onVoicePointerCancel(PointerCancelEvent event) {
+    if (!_voicePressActive) return;
+    _voicePressActive = false;
+    _cancelVoiceOnRelease = true;
+    unawaited(_cancelVoiceRecording());
+  }
+
+  Future<void> _startVoiceRecording() async {
+    setState(() {
+      _speechPhase = _SpeechPhase.connecting;
+      _speechText = '';
+    });
+    try {
+      final session = await ref.read(realtimeSpeechServiceProvider).start();
+      if (!mounted) {
+        await session.cancel();
+        return;
+      }
+      _speechSession = session;
+      _speechEventSubscription = session.events.listen((event) {
+        if (!mounted) return;
+        if (event.type == SpeechRecognitionEventType.error) {
+          _handleSpeechFailure(event.text);
+          return;
+        }
+        setState(() => _speechText = event.text);
+      });
+      setState(() => _speechPhase = _SpeechPhase.listening);
+      if (_finishVoiceWhenReady || !_voicePressActive) {
+        if (_cancelVoiceOnRelease) {
+          await _cancelVoiceRecording();
+        } else {
+          await _finishVoiceRecording();
+        }
+      }
+    } on SpeechRecognitionException catch (error) {
+      _handleSpeechFailure(error.message);
+    } catch (_) {
+      _handleSpeechFailure('语音输入启动失败，请稍后重试');
+    }
+  }
+
+  Future<void> _finishVoiceRecording() async {
+    final session = _speechSession;
+    if (session == null || _speechPhase == _SpeechPhase.finishing) return;
+    setState(() => _speechPhase = _SpeechPhase.finishing);
+    try {
+      final text = (await session.finish()).trim();
+      if (!mounted) return;
+      await _releaseSpeechSession();
+      if (!mounted) return;
+      _resetSpeechState();
+      if (text.isEmpty) {
+        AppToast.show(context, '没有听清，请再说一次');
+        return;
+      }
+      _textCtrl.text = text;
+      _sendMessage();
+    } on SpeechRecognitionException catch (error) {
+      _handleSpeechFailure(error.message);
+    } catch (_) {
+      _handleSpeechFailure('语音识别失败，请重试');
+    }
+  }
+
+  Future<void> _cancelVoiceRecording() async {
+    try {
+      await _speechSession?.cancel();
+    } finally {
+      await _releaseSpeechSession();
+      if (mounted) _resetSpeechState();
+    }
+  }
+
+  Future<void> _releaseSpeechSession() async {
+    await _speechEventSubscription?.cancel();
+    _speechEventSubscription = null;
+    await _speechSession?.dispose();
+    _speechSession = null;
+  }
+
+  void _handleSpeechFailure(String message) {
+    if (_speechPhase == _SpeechPhase.idle) return;
+    final partialText = _speechText.trim();
+    unawaited(_releaseSpeechSession());
+    if (!mounted) return;
+    _resetSpeechState();
+    if (partialText.isNotEmpty) {
+      _textCtrl.text = partialText;
+      setState(() => _voiceMode = false);
+    }
+    AppToast.show(context, message, type: AppToastType.error);
+  }
+
+  void _resetSpeechState() {
+    if (!mounted) return;
+    setState(() {
+      _speechPhase = _SpeechPhase.idle;
+      _speechText = '';
+      _voicePressActive = false;
+      _cancelVoiceOnRelease = false;
+      _finishVoiceWhenReady = false;
+      _voicePressStartY = null;
+    });
+  }
+
   void _showAttachmentPicker(BuildContext context) {
     _dismissKeyboard();
     showModalBottomSheet(
@@ -649,6 +902,82 @@ class _HomePageState extends ConsumerState<HomePage>
   }
 }
 
+enum _SpeechPhase { idle, connecting, listening, finishing }
+
+class _InputCircleButton extends StatelessWidget {
+  final IconData icon;
+  final bool elderMode;
+  final Gradient? gradient;
+  final Color iconColor;
+  final VoidCallback? onTap;
+
+  const _InputCircleButton({
+    required this.icon,
+    required this.elderMode,
+    this.gradient,
+    required this.iconColor,
+    required this.onTap,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final size = elderMode ? 52.0 : 38.0;
+    return Opacity(
+      opacity: onTap == null ? 0.45 : 1,
+      child: Material(
+        color: Colors.transparent,
+        child: InkWell(
+          customBorder: const CircleBorder(),
+          onTap: onTap,
+          child: Ink(
+            width: size,
+            height: size,
+            decoration: BoxDecoration(
+              gradient: gradient,
+              shape: BoxShape.circle,
+            ),
+            child: Icon(icon, size: elderMode ? 25 : 20, color: iconColor),
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class _VoiceHoldSurface extends StatelessWidget {
+  final bool elderMode;
+  final String label;
+  final Color color;
+
+  const _VoiceHoldSurface({
+    required this.elderMode,
+    required this.label,
+    required this.color,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      padding: EdgeInsets.symmetric(
+        horizontal: 4,
+        vertical: elderMode ? 14 : 11,
+      ),
+      alignment: Alignment.center,
+      child: Text(
+        label,
+        maxLines: 1,
+        overflow: TextOverflow.ellipsis,
+        textAlign: TextAlign.center,
+        style: TextStyle(
+          fontSize: elderMode ? 20 : 17,
+          fontWeight: FontWeight.w700,
+          color: color,
+        ),
+      ),
+    );
+  }
+}
+
 class _HomeMessages extends ConsumerWidget {
   final ScrollController scrollCtrl;
 
@@ -673,21 +1002,26 @@ class _HeaderIconButton extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final elderMode = ElderModeScope.enabledOf(context);
     return GestureDetector(
       onTap: onTap,
       child: Stack(
         clipBehavior: Clip.none,
         children: [
           Container(
-            width: 44,
-            height: 44,
+            width: elderMode ? 54 : 44,
+            height: elderMode ? 54 : 44,
             decoration: BoxDecoration(
               gradient: AppColors.surfaceGradient,
               borderRadius: BorderRadius.circular(14),
               border: Border.all(color: AppColors.borderLight),
               boxShadow: AppColors.cardShadowLight,
             ),
-            child: Icon(icon, size: 20, color: AppColors.textPrimary),
+            child: Icon(
+              icon,
+              size: elderMode ? 27 : 20,
+              color: AppColors.textPrimary,
+            ),
           ),
           if (badgeCount > 0)
             Positioned(