feat(mobile-app): 为3个主导航页面添加下拉刷新功能

- TradingPage (兑换): 添加 RefreshIndicator，刷新时重新加载钱包和收益数据
- RankingPage (龙虎榜): 添加 RefreshIndicator，刷新时 invalidate leaderboardStatusProvider
  - 列表视图和待开启状态视图均支持下拉刷新
- MiningPage (监控): 使用 LayoutBuilder + IntrinsicHeight 模式实现
  - 刷新时并行加载用户数据、授权数据和钱包状态

注：ProfilePage 已有完整的下拉刷新实现，无需修改

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/mobile-app/lib/features/mining/presentation/pages/mining_page.dart

@@ -224,6 +224,16 @@ class _MiningPageState extends ConsumerState<MiningPage> {
     );
   }
 
+  /// 下拉刷新
+  Future<void> _onRefresh() async {
+    debugPrint('[MiningPage] 下拉刷新');
+    await Future.wait([
+      _loadUserData(),
+      _loadAuthorizationData(),
+      _checkWalletStatus(),
+    ]);
+  }
+
   /// 开启监控
   void _startMonitor() {
     setState(() {
@@ -268,18 +278,35 @@ class _MiningPageState extends ConsumerState<MiningPage> {
           ),
         ),
         child: SafeArea(
-          child: Column(
+          child: RefreshIndicator(
-            children: [
+            onRefresh: _onRefresh,
-              // 顶部标题栏
+            color: const Color(0xFFD4AF37),
-              _buildAppBar(),
+            backgroundColor: Colors.white,
-              // 用户信息区域
+            child: LayoutBuilder(
-              _buildUserInfo(),
+              builder: (context, constraints) {
-              const SizedBox(height: 24),
+                return SingleChildScrollView(
-              // 挖矿状态区域
+                  physics: const AlwaysScrollableScrollPhysics(),
-              Expanded(
+                  child: ConstrainedBox(
-                child: _buildMiningStatusArea(),
+                    constraints: BoxConstraints(minHeight: constraints.maxHeight),
-              ),
+                    child: IntrinsicHeight(
-            ],
+                      child: Column(
+                        children: [
+                          // 顶部标题栏
+                          _buildAppBar(),
+                          // 用户信息区域
+                          _buildUserInfo(),
+                          const SizedBox(height: 24),
+                          // 挖矿状态区域
+                          Expanded(
+                            child: _buildMiningStatusArea(),
+                          ),
+                        ],
+                      ),
+                    ),
+                  ),
+                );
+              },
+            ),
           ),
         ),
       ),

frontend/mobile-app/lib/features/ranking/presentation/pages/ranking_page.dart

@@ -88,6 +88,13 @@ class _RankingPageState extends ConsumerState<RankingPage> {
     ),
   ];
 
+  /// 下拉刷新
+  Future<void> _onRefresh() async {
+    debugPrint('[RankingPage] 下拉刷新');
+    ref.invalidate(leaderboardStatusProvider);
+    // TODO: 未来对接真实排行榜数据时，在此处 invalidate 排行榜数据 Provider
+  }
+
   /// 切换排行榜类型
   void _selectRankingType(RankingType type) {
     setState(() {
@@ -198,46 +205,61 @@ class _RankingPageState extends ConsumerState<RankingPage> {
         break;
     }
 
-    return Center(
+    return RefreshIndicator(
-      child: Column(
+      onRefresh: _onRefresh,
-        mainAxisAlignment: MainAxisAlignment.center,
+      color: const Color(0xFFD4AF37),
-        children: [
+      backgroundColor: Colors.white,
-          // 图标
+      child: LayoutBuilder(
-          Container(
+        builder: (context, constraints) {
-            width: 80,
+          return SingleChildScrollView(
-            height: 80,
+            physics: const AlwaysScrollableScrollPhysics(),
-            decoration: BoxDecoration(
+            child: ConstrainedBox(
-              color: const Color(0x1A8B5A2B),
+              constraints: BoxConstraints(minHeight: constraints.maxHeight),
-              borderRadius: BorderRadius.circular(40),
+              child: Center(
+                child: Column(
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  children: [
+                    // 图标
+                    Container(
+                      width: 80,
+                      height: 80,
+                      decoration: BoxDecoration(
+                        color: const Color(0x1A8B5A2B),
+                        borderRadius: BorderRadius.circular(40),
+                      ),
+                      child: const Icon(
+                        Icons.hourglass_empty,
+                        size: 40,
+                        color: Color(0xFF8B5A2B),
+                      ),
+                    ),
+                    const SizedBox(height: 24),
+                    // 标题
+                    Text(
+                      '$boardName待开启',
+                      style: const TextStyle(
+                        fontSize: 18,
+                        fontFamily: 'Inter',
+                        fontWeight: FontWeight.w700,
+                        color: Color(0xFF5D4037),
+                      ),
+                    ),
+                    const SizedBox(height: 8),
+                    // 描述
+                    const Text(
+                      '该榜单暂未开启，请稍后再来',
+                      style: TextStyle(
+                        fontSize: 14,
+                        fontFamily: 'Inter',
+                        color: Color(0xFF8B5A2B),
+                      ),
+                    ),
+                  ],
+                ),
+              ),
             ),
-            child: const Icon(
+          );
-              Icons.hourglass_empty,
+        },
-              size: 40,
-              color: Color(0xFF8B5A2B),
-            ),
-          ),
-          const SizedBox(height: 24),
-          // 标题
-          Text(
-            '$boardName待开启',
-            style: const TextStyle(
-              fontSize: 18,
-              fontFamily: 'Inter',
-              fontWeight: FontWeight.w700,
-              color: Color(0xFF5D4037),
-            ),
-          ),
-          const SizedBox(height: 8),
-          // 描述
-          const Text(
-            '该榜单暂未开启，请稍后再来',
-            style: TextStyle(
-              fontSize: 14,
-              fontFamily: 'Inter',
-              color: Color(0xFF8B5A2B),
-            ),
-          ),
-        ],
       ),
     );
   }
@@ -461,15 +483,21 @@ class _RankingPageState extends ConsumerState<RankingPage> {
 
   /// 构建排行榜列表
   Widget _buildRankingList() {
-    return ListView.builder(
+    return RefreshIndicator(
-      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
+      onRefresh: _onRefresh,
-      itemCount: _mockRankingData.length,
+      color: const Color(0xFFD4AF37),
-      itemBuilder: (context, index) {
+      backgroundColor: Colors.white,
-        return Padding(
+      child: ListView.builder(
-          padding: const EdgeInsets.only(bottom: 4),
+        physics: const AlwaysScrollableScrollPhysics(),
-          child: _buildRankingItem(_mockRankingData[index]),
+        padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
-        );
+        itemCount: _mockRankingData.length,
-      },
+        itemBuilder: (context, index) {
+          return Padding(
+            padding: const EdgeInsets.only(bottom: 4),
+            child: _buildRankingItem(_mockRankingData[index]),
+          );
+        },
+      ),
     );
   }
 

frontend/mobile-app/lib/features/trading/presentation/pages/trading_page.dart

@@ -218,6 +218,12 @@ class _TradingPageState extends ConsumerState<TradingPage> {
     }
   }
 
+  /// 下拉刷新
+  Future<void> _onRefresh() async {
+    debugPrint('[TradingPage] 下拉刷新');
+    await _loadWalletData();
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -236,8 +242,13 @@ class _TradingPageState extends ConsumerState<TradingPage> {
           ),
         ),
         child: SafeArea(
-          child: SingleChildScrollView(
+          child: RefreshIndicator(
-            child: Column(
+            onRefresh: _onRefresh,
+            color: const Color(0xFFD4AF37),
+            backgroundColor: Colors.white,
+            child: SingleChildScrollView(
+              physics: const AlwaysScrollableScrollPhysics(),
+              child: Column(
               children: [
                 // 顶部标题栏
                 _buildAppBar(),
@@ -273,6 +284,7 @@ class _TradingPageState extends ConsumerState<TradingPage> {
             ),
           ),
         ),
+        ),
       ),
     );
   }