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(() {
@@ -268,6 +278,17 @@ class _MiningPageState extends ConsumerState<MiningPage> {
           ),
         ),
         child: SafeArea(
+          child: RefreshIndicator(
+            onRefresh: _onRefresh,
+            color: const Color(0xFFD4AF37),
+            backgroundColor: Colors.white,
+            child: LayoutBuilder(
+              builder: (context, constraints) {
+                return SingleChildScrollView(
+                  physics: const AlwaysScrollableScrollPhysics(),
+                  child: ConstrainedBox(
+                    constraints: BoxConstraints(minHeight: constraints.maxHeight),
+                    child: IntrinsicHeight(
                       child: Column(
                         children: [
                           // 顶部标题栏
@@ -284,6 +305,12 @@ class _MiningPageState extends ConsumerState<MiningPage> {
                     ),
                   ),
                 );
+              },
+            ),
+          ),
+        ),
+      ),
+    );
   }
 
   /// 构建顶部标题栏

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(() {
@@ -198,7 +205,17 @@ class _RankingPageState extends ConsumerState<RankingPage> {
         break;
     }
 
-    return Center(
+    return RefreshIndicator(
+      onRefresh: _onRefresh,
+      color: const Color(0xFFD4AF37),
+      backgroundColor: Colors.white,
+      child: LayoutBuilder(
+        builder: (context, constraints) {
+          return SingleChildScrollView(
+            physics: const AlwaysScrollableScrollPhysics(),
+            child: ConstrainedBox(
+              constraints: BoxConstraints(minHeight: constraints.maxHeight),
+              child: Center(
                 child: Column(
                   mainAxisAlignment: MainAxisAlignment.center,
                   children: [
@@ -239,6 +256,11 @@ class _RankingPageState extends ConsumerState<RankingPage> {
                     ),
                   ],
                 ),
+              ),
+            ),
+          );
+        },
+      ),
     );
   }
 
@@ -461,7 +483,12 @@ class _RankingPageState extends ConsumerState<RankingPage> {
 
   /// 构建排行榜列表
   Widget _buildRankingList() {
-    return ListView.builder(
+    return RefreshIndicator(
+      onRefresh: _onRefresh,
+      color: const Color(0xFFD4AF37),
+      backgroundColor: Colors.white,
+      child: ListView.builder(
+        physics: const AlwaysScrollableScrollPhysics(),
         padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 8),
         itemCount: _mockRankingData.length,
         itemBuilder: (context, index) {
@@ -470,6 +497,7 @@ class _RankingPageState extends ConsumerState<RankingPage> {
             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(
@@ -236,7 +242,12 @@ class _TradingPageState extends ConsumerState<TradingPage> {
           ),
         ),
         child: SafeArea(
+          child: RefreshIndicator(
+            onRefresh: _onRefresh,
+            color: const Color(0xFFD4AF37),
+            backgroundColor: Colors.white,
             child: SingleChildScrollView(
+              physics: const AlwaysScrollableScrollPhysics(),
               child: Column(
               children: [
                 // 顶部标题栏
@@ -274,6 +285,7 @@ class _TradingPageState extends ConsumerState<TradingPage> {
           ),
         ),
         ),
+      ),
     );
   }