feat(usage): 添加AI聊天统计视图的切换功能

实现通过快速点击翻译统计标题三次来切换显示/隐藏AI聊天统计视图
修改底部导航栏根据显示状态动态调整项目

lib/modules/usage/controllers/translation_stats_controller.dart

@@ -2,6 +2,7 @@ import 'package:get/get.dart';
 import '../../../data/services/usage_stats_service.dart';
 import '../../../data/models/translation_usage_stats.dart';
 import '../../../core/utils/logger.dart';
+import 'usage_controller.dart';
 
 class TranslationStatsController extends GetxController {
   final UsageStatsService _usageService = Get.find<UsageStatsService>();
@@ -297,6 +298,24 @@ class TranslationStatsController extends GetxController {
     return '¥${cost.toStringAsFixed(2)}';
   }
 
+  int _titleTapCount = 0;
+  int _lastTitleTapTs = 0;
+
+  void onTitleTap() {
+    final now = DateTime.now().millisecondsSinceEpoch;
+    if (now - _lastTitleTapTs <= 800) {
+      _titleTapCount++;
+    } else {
+      _titleTapCount = 1;
+    }
+    _lastTitleTapTs = now;
+    if (_titleTapCount >= 3) {
+      _titleTapCount = 0;
+      final uc = Get.find<UsageController>();
+      uc.toggleAiChat(!uc.showAiChat.value);
+    }
+  }
+
   String formatNumber(int number) {
     if (number < 1000) {
       return number.toString();

lib/modules/usage/controllers/usage_controller.dart

@@ -8,15 +8,34 @@ class UsageController extends GetxController {
   late PageController pageController;
   final RxInt pageIndex = 0.obs;
 
-  final List<Widget> pageList = const [
-    AiChatStatsView(),
-    TranslationStatsView(),
-    MeetingStatsView(),
-  ];
+  final RxBool showAiChat = false.obs;
+
+  List<Widget> get pageList => showAiChat.value
+      ? const [
+          AiChatStatsView(),
+          TranslationStatsView(),
+          MeetingStatsView(),
+        ]
+      : const [
+          TranslationStatsView(),
+          MeetingStatsView(),
+        ];
 
   @override
   void onInit() {
     super.onInit();
     pageController = PageController(initialPage: 0);
   }
+
+  void toggleAiChat(bool enable) {
+    if (showAiChat.value == enable) return;
+    showAiChat.value = enable;
+    final int maxIndex = pageList.length - 1;
+    if (pageIndex.value > maxIndex) {
+      pageIndex.value = maxIndex;
+      pageController.jumpToPage(maxIndex);
+    } else {
+      pageController.jumpToPage(pageIndex.value);
+    }
+  }
 }

lib/modules/usage/views/translation_stats_view.dart

@@ -33,12 +33,15 @@ class TranslationStatsView extends GetView<TranslationStatsController> {
       ),
       backgroundColor: isDarkMode ? AppColors.darkBackground : Colors.white,
       elevation: 0.5,
-      title: Text(
-        '翻译统计',
-        style: TextStyle(
-          fontSize: 17.sp,
-          fontWeight: FontWeight.w600,
-          color: isDarkMode ? Colors.white : Colors.black,
+      title: GestureDetector(
+        onTap: controller.onTitleTap,
+        child: Text(
+          '翻译统计',
+          style: TextStyle(
+            fontSize: 17.sp,
+            fontWeight: FontWeight.w600,
+            color: isDarkMode ? Colors.white : Colors.black,
+          ),
         ),
       ),
       centerTitle: true,

lib/modules/usage/views/usage_view.dart

@@ -7,13 +7,6 @@ import '../controllers/usage_controller.dart';
 class UsageView extends GetView<UsageController> {
   const UsageView({super.key});
 
-  // 1. 将导航栏配置提取为常量，提高可维护性
-  static const _navItems = [
-    _NavItem(Icons.chat_bubble_outline, 'AI chat'),
-    _NavItem(Icons.translate, 'interpretation'),
-    _NavItem(Icons.people, 'meeting'),
-  ];
-
   // 2. 颜色配置集中管理
   Color _getBgColor(bool isDark) =>
       isDark ? Colors.black : const Color(0xFFF9FAFB);
@@ -28,11 +21,11 @@ class UsageView extends GetView<UsageController> {
 
     return Scaffold(
       backgroundColor: isDarkMode ? AppColors.darkBackground : Colors.grey[50],
-      body: PageView(
-        physics: const NeverScrollableScrollPhysics(),
-        controller: controller.pageController,
-        children: controller.pageList,
-      ),
+      body: Obx(() => PageView(
+            physics: const NeverScrollableScrollPhysics(),
+            controller: controller.pageController,
+            children: controller.pageList,
+          )),
       bottomNavigationBar: Obx(
         () {
           final currentIndex = controller.pageIndex.value;
@@ -48,7 +41,16 @@ class UsageView extends GetView<UsageController> {
             // 3. 添加安全区域适配（针对刘海屏）
             child: BottomNavigationBar(
               // 4. 使用生成的导航项
-              items: _navItems
+              items: (controller.showAiChat.value
+                      ? const [
+                          _NavItem(Icons.chat_bubble_outline, 'AI chat'),
+                          _NavItem(Icons.translate, 'interpretation'),
+                          _NavItem(Icons.people, 'meeting'),
+                        ]
+                      : const [
+                          _NavItem(Icons.translate, 'interpretation'),
+                          _NavItem(Icons.people, 'meeting'),
+                        ])
                   .map((item) => BottomNavigationBarItem(
                         icon: Icon(item.icon),
                         activeIcon: Icon(item.icon,
@@ -70,8 +72,8 @@ class UsageView extends GetView<UsageController> {
               type: BottomNavigationBarType.fixed,
               // 7. 增加图标和文字的间距
               iconSize: 22.w, // 响应式图标尺寸
-              selectedLabelStyle: TextStyle(height: 1.5), // 文字垂直间距
-              unselectedLabelStyle: TextStyle(height: 1.5),
+              selectedLabelStyle: TextStyle(height: 1.5.sp), // 文字垂直间距
+              unselectedLabelStyle: TextStyle(height: 1.5.sp),
             ),
           );
         },