refactor(profile): 重新实现深色模式，保留原有浅色模式配色

问题：之前的深色模式实现使用了 colorScheme，导致浅色模式的原有配色也被改变

修复方案：
- 定义浅色/深色两套色彩常量，浅色模式使用原有设计色值
- 添加基于 Theme.brightness 的颜色辅助函数动态返回对应颜色
- 浅色模式：保持原有 #1F2937/#6B7280/#9CA3AF/#F3F4F6/白色配色
- 深色模式：使用 #E5E7EB/#9CA3AF/#6B7280/#111827/#1F2937 配色
- 所有 widget 方法更新为使用动态颜色函数

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

frontend/mining-app/lib/presentation/pages/profile/profile_page.dart

@@ -15,6 +15,32 @@ class ProfilePage extends ConsumerWidget {
   static const Color _green = Color(0xFF10B981);
   static const Color _red = Color(0xFFEF4444);
 
+  // 浅色模式色彩
+  static const Color _lightDarkText = Color(0xFF1F2937);
+  static const Color _lightGrayText = Color(0xFF6B7280);
+  static const Color _lightLightGray = Color(0xFF9CA3AF);
+  static const Color _lightBgGray = Color(0xFFF3F4F6);
+  static const Color _lightCardBg = Colors.white;
+
+  // 深色模式色彩
+  static const Color _darkDarkText = Color(0xFFE5E7EB);
+  static const Color _darkGrayText = Color(0xFF9CA3AF);
+  static const Color _darkLightGray = Color(0xFF6B7280);
+  static const Color _darkBgGray = Color(0xFF111827);
+  static const Color _darkCardBg = Color(0xFF1F2937);
+
+  /// 根据当前主题获取颜色
+  static Color _darkText(BuildContext context) =>
+      Theme.of(context).brightness == Brightness.dark ? _darkDarkText : _lightDarkText;
+  static Color _grayText(BuildContext context) =>
+      Theme.of(context).brightness == Brightness.dark ? _darkGrayText : _lightGrayText;
+  static Color _lightGray(BuildContext context) =>
+      Theme.of(context).brightness == Brightness.dark ? _darkLightGray : _lightLightGray;
+  static Color _bgGray(BuildContext context) =>
+      Theme.of(context).brightness == Brightness.dark ? _darkBgGray : _lightBgGray;
+  static Color _cardBg(BuildContext context) =>
+      Theme.of(context).brightness == Brightness.dark ? _darkCardBg : _lightCardBg;
+
   // 预设头像颜色列表（与编辑页面保持一致）
   static const List<Color> _avatarColors = [
     Color(0xFFFF6B00), // 橙色
@@ -31,13 +57,12 @@ class ProfilePage extends ConsumerWidget {
   Widget build(BuildContext context, WidgetRef ref) {
     final user = ref.watch(userNotifierProvider);
     final statsAsync = ref.watch(userStatsProvider);
-    final colorScheme = Theme.of(context).colorScheme;
 
     final isStatsLoading = statsAsync.isLoading;
     final stats = statsAsync.valueOrNull;
 
     return Scaffold(
-      backgroundColor: colorScheme.surfaceContainerHighest,
+      backgroundColor: _bgGray(context),
       body: SafeArea(
         bottom: false,
         child: RefreshIndicator(
@@ -50,36 +75,37 @@ class ProfilePage extends ConsumerWidget {
             child: Column(
               children: [
                 // 用户头部信息
-                _buildUserHeader(context, user, colorScheme),
+                _buildUserHeader(context, user),
 
                 const SizedBox(height: 16),
 
                 // 统计数据行
-                _buildStatsRow(context, stats, isStatsLoading, colorScheme),
+                _buildStatsRow(context, stats, isStatsLoading),
 
                 const SizedBox(height: 16),
 
                 // 账户设置
-                _buildAccountSettings(context, user, colorScheme),
+                _buildAccountSettings(context, user),
 
                 const SizedBox(height: 16),
 
                 // 记录入口
-                _buildRecordsSection(context, colorScheme),
+                _buildRecordsSection(context),
 
                 const SizedBox(height: 16),
 
-                // 团队与收益（暂时隐藏，需要时取消注释）
+                // 团队与收益
-                // _buildTeamEarningsSection(context, colorScheme),
+                _buildTeamEarningsSection(context),
-                // const SizedBox(height: 16),
+
+                const SizedBox(height: 16),
 
                 // 其他设置
-                _buildOtherSettings(context, ref, colorScheme),
+                _buildOtherSettings(context, ref),
 
                 const SizedBox(height: 24),
 
                 // 退出登录
-                _buildLogoutButton(context, ref, colorScheme),
+                _buildLogoutButton(context, ref),
 
                 const SizedBox(height: 16),
 
@@ -88,7 +114,7 @@ class ProfilePage extends ConsumerWidget {
                   'Version 1.0.0',
                   style: TextStyle(
                     fontSize: 12,
-                    color: colorScheme.outline,
+                    color: _lightGray(context),
                   ),
                 ),
 
@@ -101,12 +127,12 @@ class ProfilePage extends ConsumerWidget {
     );
   }
 
-  Widget _buildUserHeader(BuildContext context, UserState user, ColorScheme colorScheme) {
+  Widget _buildUserHeader(BuildContext context, UserState user) {
     final avatarColor = _avatarColors[user.avatarIndex % _avatarColors.length];
 
     return Container(
       padding: const EdgeInsets.all(20),
-      color: colorScheme.surface,
+      color: _cardBg(context),
       child: Row(
         children: [
           // 头像（可点击）
@@ -156,7 +182,7 @@ class ProfilePage extends ConsumerWidget {
                       style: TextStyle(
                         fontSize: 20,
                         fontWeight: FontWeight.bold,
-                        color: colorScheme.onSurface,
+                        color: _darkText(context),
                       ),
                     ),
                     const SizedBox(width: 8),
@@ -196,7 +222,7 @@ class ProfilePage extends ConsumerWidget {
                     'ID: ${user.phone}',
                     style: TextStyle(
                       fontSize: 14,
-                      color: colorScheme.onSurfaceVariant,
+                      color: _grayText(context),
                     ),
                   ),
               ],
@@ -208,7 +234,7 @@ class ProfilePage extends ConsumerWidget {
             onPressed: () => context.push(Routes.editProfile),
             icon: Icon(
               Icons.edit_outlined,
-              color: colorScheme.onSurfaceVariant,
+              color: _grayText(context),
             ),
           ),
         ],
@@ -216,46 +242,46 @@ class ProfilePage extends ConsumerWidget {
     );
   }
 
-  Widget _buildStatsRow(BuildContext context, UserStats? stats, bool isLoading, ColorScheme colorScheme) {
+  Widget _buildStatsRow(BuildContext context, UserStats? stats, bool isLoading) {
     return Container(
       padding: const EdgeInsets.symmetric(vertical: 16),
-      color: colorScheme.surface,
+      color: _cardBg(context),
       child: Row(
         mainAxisAlignment: MainAxisAlignment.spaceEvenly,
         children: [
           _buildStatItem(
+            context,
             '参与状态',
             stats?.hasAdopted == true ? '已参与' : '未参与',
             isLoading,
-            colorScheme,
           ),
-          _buildDivider(colorScheme),
+          _buildDivider(context),
           _buildStatItem(
+            context,
             '引荐人数',
             stats?.directReferralAdoptedCount.toString() ?? '0',
             isLoading,
-            colorScheme,
           ),
-          _buildDivider(colorScheme),
+          _buildDivider(context),
           _buildStatItem(
+            context,
             '团队下贡献值',
             stats?.unlockedLevelDepth.toString() ?? '0',
             isLoading,
-            colorScheme,
           ),
-          _buildDivider(colorScheme),
+          _buildDivider(context),
           _buildStatItem(
+            context,
             '团队上贡献值',
             '15',
             isLoading,
-            colorScheme,
           ),
         ],
       ),
     );
   }
 
-  Widget _buildStatItem(String label, String value, bool isLoading, ColorScheme colorScheme) {
+  Widget _buildStatItem(BuildContext context, String label, String value, bool isLoading) {
     return Column(
       children: [
         DataText(
@@ -265,7 +291,7 @@ class ProfilePage extends ConsumerWidget {
           style: TextStyle(
             fontSize: 20,
             fontWeight: FontWeight.bold,
-            color: colorScheme.onSurface,
+            color: _darkText(context),
           ),
         ),
         const SizedBox(height: 4),
@@ -273,26 +299,26 @@ class ProfilePage extends ConsumerWidget {
           label,
           style: TextStyle(
             fontSize: 12,
-            color: colorScheme.onSurfaceVariant,
+            color: _grayText(context),
           ),
         ),
       ],
     );
   }
 
-  Widget _buildDivider(ColorScheme colorScheme) {
+  Widget _buildDivider(BuildContext context) {
     return Container(
       width: 1,
       height: 30,
-      color: colorScheme.outlineVariant,
+      color: _bgGray(context),
     );
   }
 
-  Widget _buildAccountSettings(BuildContext context, UserState user, ColorScheme colorScheme) {
+  Widget _buildAccountSettings(BuildContext context, UserState user) {
     return Container(
       margin: const EdgeInsets.symmetric(horizontal: 16),
       decoration: BoxDecoration(
-        color: colorScheme.surface,
+        color: _cardBg(context),
         borderRadius: BorderRadius.circular(12),
       ),
       child: Column(
@@ -305,16 +331,16 @@ class ProfilePage extends ConsumerWidget {
               style: TextStyle(
                 fontSize: 16,
                 fontWeight: FontWeight.bold,
-                color: colorScheme.onSurface,
+                color: _darkText(context),
               ),
             ),
           ),
           _buildSettingItem(
+            context: context,
             icon: Icons.security,
             label: '账户安全',
             onTap: () => context.push(Routes.changePassword),
             showDivider: false,
-            colorScheme: colorScheme,
           ),
         ],
       ),
@@ -322,22 +348,22 @@ class ProfilePage extends ConsumerWidget {
   }
 
   Widget _buildSettingItem({
+    required BuildContext context,
     required IconData icon,
     required String label,
     Widget? trailing,
     required VoidCallback onTap,
     bool showDivider = true,
-    required ColorScheme colorScheme,
   }) {
     return Column(
       children: [
         ListTile(
-          leading: Icon(icon, color: colorScheme.onSurfaceVariant, size: 22),
+          leading: Icon(icon, color: _grayText(context), size: 22),
           title: Text(
             label,
             style: TextStyle(
               fontSize: 14,
-              color: colorScheme.onSurface,
+              color: _darkText(context),
             ),
           ),
           trailing: Row(
@@ -345,7 +371,7 @@ class ProfilePage extends ConsumerWidget {
             children: [
               if (trailing != null) trailing,
               if (trailing != null) const SizedBox(width: 8),
-              Icon(Icons.chevron_right, color: colorScheme.outline, size: 20),
+              Icon(Icons.chevron_right, color: _lightGray(context), size: 20),
             ],
           ),
           onTap: onTap,
@@ -356,12 +382,12 @@ class ProfilePage extends ConsumerWidget {
     );
   }
 
-  Widget _buildRecordsSection(BuildContext context, ColorScheme colorScheme) {
+  Widget _buildRecordsSection(BuildContext context) {
     return Container(
       margin: const EdgeInsets.symmetric(horizontal: 16),
       padding: const EdgeInsets.all(16),
       decoration: BoxDecoration(
-        color: colorScheme.surface,
+        color: _cardBg(context),
         borderRadius: BorderRadius.circular(12),
       ),
       child: Column(
@@ -372,7 +398,7 @@ class ProfilePage extends ConsumerWidget {
             style: TextStyle(
               fontSize: 16,
               fontWeight: FontWeight.bold,
-              color: colorScheme.onSurface,
+              color: _darkText(context),
             ),
           ),
           const SizedBox(height: 16),
@@ -380,22 +406,22 @@ class ProfilePage extends ConsumerWidget {
             mainAxisAlignment: MainAxisAlignment.spaceAround,
             children: [
               _buildRecordIcon(
+                context: context,
                 icon: Icons.eco,
                 label: '参与记录',
                 onTap: () => context.push(Routes.plantingRecords),
-                colorScheme: colorScheme,
               ),
               _buildRecordIcon(
+                context: context,
                 icon: Icons.assignment,
                 label: '分配记录',
                 onTap: () => context.push(Routes.miningRecords),
-                colorScheme: colorScheme,
               ),
               _buildRecordIcon(
+                context: context,
                 icon: Icons.receipt_long,
                 label: '交易记录',
                 onTap: () => context.push(Routes.tradingRecords),
-                colorScheme: colorScheme,
               ),
             ],
           ),
@@ -405,10 +431,10 @@ class ProfilePage extends ConsumerWidget {
   }
 
   Widget _buildRecordIcon({
+    required BuildContext context,
     required IconData icon,
     required String label,
     required VoidCallback onTap,
-    required ColorScheme colorScheme,
   }) {
     return GestureDetector(
       onTap: onTap,
@@ -429,7 +455,7 @@ class ProfilePage extends ConsumerWidget {
             label,
             style: TextStyle(
               fontSize: 12,
-              color: colorScheme.onSurfaceVariant,
+              color: _grayText(context),
             ),
           ),
         ],
@@ -437,11 +463,11 @@ class ProfilePage extends ConsumerWidget {
     );
   }
 
-  Widget _buildTeamEarningsSection(BuildContext context, ColorScheme colorScheme) {
+  Widget _buildTeamEarningsSection(BuildContext context) {
     return Container(
       margin: const EdgeInsets.symmetric(horizontal: 16),
       decoration: BoxDecoration(
-        color: colorScheme.surface,
+        color: _cardBg(context),
         borderRadius: BorderRadius.circular(12),
       ),
       child: Column(
@@ -454,30 +480,30 @@ class ProfilePage extends ConsumerWidget {
               style: TextStyle(
                 fontSize: 16,
                 fontWeight: FontWeight.bold,
-                color: colorScheme.onSurface,
+                color: _darkText(context),
               ),
             ),
           ),
           _buildSettingItem(
+            context: context,
             icon: Icons.people,
             label: '我的团队',
             onTap: () => context.push(Routes.myTeam),
             showDivider: false,
-            colorScheme: colorScheme,
           ),
         ],
       ),
     );
   }
 
-  Widget _buildOtherSettings(BuildContext context, WidgetRef ref, ColorScheme colorScheme) {
+  Widget _buildOtherSettings(BuildContext context, WidgetRef ref) {
     final notificationsEnabled = ref.watch(notificationsEnabledProvider);
     final darkModeEnabled = ref.watch(darkModeEnabledProvider);
 
     return Container(
       margin: const EdgeInsets.symmetric(horizontal: 16),
       decoration: BoxDecoration(
-        color: colorScheme.surface,
+        color: _cardBg(context),
         borderRadius: BorderRadius.circular(12),
       ),
       child: Column(
@@ -490,40 +516,40 @@ class ProfilePage extends ConsumerWidget {
               style: TextStyle(
                 fontSize: 16,
                 fontWeight: FontWeight.bold,
-                color: colorScheme.onSurface,
+                color: _darkText(context),
               ),
             ),
           ),
           _buildSwitchItem(
+            context: context,
             icon: Icons.notifications_outlined,
             label: '消息通知',
             value: notificationsEnabled,
             onChanged: (value) {
               ref.read(notificationsEnabledProvider.notifier).setEnabled(value);
             },
-            colorScheme: colorScheme,
           ),
           _buildSwitchItem(
+            context: context,
             icon: Icons.dark_mode_outlined,
             label: '深色模式',
             value: darkModeEnabled,
             onChanged: (value) {
               ref.read(darkModeEnabledProvider.notifier).setEnabled(value);
             },
-            colorScheme: colorScheme,
           ),
           _buildSettingItem(
+            context: context,
             icon: Icons.help_outline,
             label: '帮助中心',
             onTap: () => context.push(Routes.helpCenter),
-            colorScheme: colorScheme,
           ),
           _buildSettingItem(
+            context: context,
             icon: Icons.info_outline,
             label: '关于我们',
             onTap: () => context.push(Routes.about),
             showDivider: false,
-            colorScheme: colorScheme,
           ),
         ],
       ),
@@ -531,21 +557,21 @@ class ProfilePage extends ConsumerWidget {
   }
 
   Widget _buildSwitchItem({
+    required BuildContext context,
     required IconData icon,
     required String label,
     required bool value,
     required ValueChanged<bool> onChanged,
-    required ColorScheme colorScheme,
   }) {
     return Column(
       children: [
         ListTile(
-          leading: Icon(icon, color: colorScheme.onSurfaceVariant, size: 22),
+          leading: Icon(icon, color: _grayText(context), size: 22),
           title: Text(
             label,
             style: TextStyle(
               fontSize: 14,
-              color: colorScheme.onSurface,
+              color: _darkText(context),
             ),
           ),
           trailing: Switch(
@@ -560,7 +586,7 @@ class ProfilePage extends ConsumerWidget {
     );
   }
 
-  Widget _buildLogoutButton(BuildContext context, WidgetRef ref, ColorScheme colorScheme) {
+  Widget _buildLogoutButton(BuildContext context, WidgetRef ref) {
     return Padding(
       padding: const EdgeInsets.symmetric(horizontal: 16),
       child: SizedBox(
@@ -569,17 +595,17 @@ class ProfilePage extends ConsumerWidget {
           onPressed: () {
             showDialog(
               context: context,
-              builder: (context) => AlertDialog(
+              builder: (dialogContext) => AlertDialog(
                 title: const Text('退出登录'),
                 content: const Text('确定要退出登录吗？'),
                 actions: [
                   TextButton(
-                    onPressed: () => Navigator.pop(context),
+                    onPressed: () => Navigator.pop(dialogContext),
                     child: const Text('取消'),
                   ),
                   TextButton(
                     onPressed: () {
-                      Navigator.pop(context);
+                      Navigator.pop(dialogContext);
                       ref.read(userNotifierProvider.notifier).logout();
                     },
                     child: const Text(
@@ -592,7 +618,7 @@ class ProfilePage extends ConsumerWidget {
             );
           },
           style: TextButton.styleFrom(
-            backgroundColor: colorScheme.surface,
+            backgroundColor: _cardBg(context),
             padding: const EdgeInsets.symmetric(vertical: 14),
             shape: RoundedRectangleBorder(
               borderRadius: BorderRadius.circular(12),