feat(mining-app): implement hide/show amounts toggle

- Add hideAmountsProvider to control amount visibility
- Add tap handler to eye icon in total contribution card
- Toggle icon between visibility_outlined and visibility_off_outlined
- Hide amounts with **** when toggled in:
  - Total contribution value
  - Three column stats (personal, team level, team bonus)
  - Today's estimated earnings
  - Contribution detail summary rows

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

frontend/mining-app/lib/presentation/pages/contribution/contribution_page.dart

@@ -71,16 +71,16 @@ class ContributionPage extends ConsumerWidget {
                       sliver: SliverList(
                         delegate: SliverChildListDelegate([
                           // 总贡献值卡片
-                          _buildTotalContributionCard(contribution, isLoading),
+                          _buildTotalContributionCard(ref, contribution, isLoading),
                           const SizedBox(height: 16),
                           // 三栏统计
-                          _buildThreeColumnStats(contribution, isLoading),
+                          _buildThreeColumnStats(ref, contribution, isLoading),
                           const SizedBox(height: 16),
                           // 今日预估收益
-                          _buildTodayEstimateCard(estimatedEarnings, isLoading || isStatsLoading),
+                          _buildTodayEstimateCard(ref, estimatedEarnings, isLoading || isStatsLoading),
                           const SizedBox(height: 16),
                           // 贡献值明细（三类汇总）
-                          _buildContributionDetailCard(context, contribution, isLoading),
+                          _buildContributionDetailCard(context, ref, contribution, isLoading),
                           const SizedBox(height: 16),
                           // 团队层级统计
                           _buildTeamStatsCard(contribution, isLoading),
@@ -156,8 +156,9 @@ class ContributionPage extends ConsumerWidget {
     );
   }
 
-  Widget _buildTotalContributionCard(Contribution? contribution, bool isLoading) {
+  Widget _buildTotalContributionCard(WidgetRef ref, Contribution? contribution, bool isLoading) {
     final total = contribution?.totalContribution ?? '0';
+    final hideAmounts = ref.watch(hideAmountsProvider);
     return Container(
       padding: const EdgeInsets.all(20),
       decoration: BoxDecoration(
@@ -174,12 +175,21 @@ class ContributionPage extends ConsumerWidget {
                 '总贡献值',
                 style: TextStyle(fontSize: 14, fontWeight: FontWeight.w500, color: _grayText),
               ),
-              Icon(Icons.visibility_outlined, color: _grayText.withOpacity(0.5), size: 18),
+              GestureDetector(
+                onTap: () {
+                  ref.read(hideAmountsProvider.notifier).state = !hideAmounts;
+                },
+                child: Icon(
+                  hideAmounts ? Icons.visibility_off_outlined : Icons.visibility_outlined,
+                  color: _grayText.withOpacity(0.5),
+                  size: 18,
+                ),
+              ),
             ],
           ),
           const SizedBox(height: 8),
           DataText(
-            data: isLoading ? null : formatAmount(total),
+            data: isLoading ? null : (hideAmounts ? '******' : formatAmount(total)),
             isLoading: isLoading,
             placeholder: '----',
             style: const TextStyle(
@@ -214,7 +224,8 @@ class ContributionPage extends ConsumerWidget {
     );
   }
 
-  Widget _buildThreeColumnStats(Contribution? contribution, bool isLoading) {
+  Widget _buildThreeColumnStats(WidgetRef ref, Contribution? contribution, bool isLoading) {
+    final hideAmounts = ref.watch(hideAmountsProvider);
     return Container(
       padding: const EdgeInsets.all(20),
       decoration: BoxDecoration(
@@ -223,15 +234,15 @@ class ContributionPage extends ConsumerWidget {
       ),
       child: Row(
         children: [
-          _buildStatColumn('个人贡献值', contribution?.personalContribution, isLoading, false),
-          _buildStatColumn('团队层级', contribution?.teamLevelContribution, isLoading, true),
-          _buildStatColumn('团队奖励', contribution?.teamBonusContribution, isLoading, true),
+          _buildStatColumn('个人贡献值', contribution?.personalContribution, isLoading, false, hideAmounts),
+          _buildStatColumn('团队层级', contribution?.teamLevelContribution, isLoading, true, hideAmounts),
+          _buildStatColumn('团队奖励', contribution?.teamBonusContribution, isLoading, true, hideAmounts),
         ],
       ),
     );
   }
 
-  Widget _buildStatColumn(String label, String? value, bool isLoading, bool showLeftBorder) {
+  Widget _buildStatColumn(String label, String? value, bool isLoading, bool showLeftBorder, bool hideAmounts) {
     return Expanded(
       child: Container(
         decoration: showLeftBorder
@@ -245,7 +256,7 @@ class ContributionPage extends ConsumerWidget {
             Text(label, style: const TextStyle(fontSize: 12, color: _grayText)),
             const SizedBox(height: 4),
             DataText(
-              data: value != null ? formatAmount(value) : null,
+              data: value != null ? (hideAmounts ? '****' : formatAmount(value)) : null,
               isLoading: isLoading,
               placeholder: '--',
               style: const TextStyle(fontSize: 14, fontWeight: FontWeight.bold, color: _darkText),
@@ -257,7 +268,8 @@ class ContributionPage extends ConsumerWidget {
     );
   }
 
-  Widget _buildTodayEstimateCard(EstimatedEarnings earnings, bool isLoading) {
+  Widget _buildTodayEstimateCard(WidgetRef ref, EstimatedEarnings earnings, bool isLoading) {
+    final hideAmounts = ref.watch(hideAmountsProvider);
     return Container(
       padding: const EdgeInsets.all(20),
       decoration: BoxDecoration(
@@ -306,7 +318,7 @@ class ContributionPage extends ConsumerWidget {
                       TextSpan(
                         children: [
                           TextSpan(
-                            text: earnings.isValid ? formatAmount(earnings.dailyShares) : '--',
+                            text: hideAmounts ? '****' : (earnings.isValid ? formatAmount(earnings.dailyShares) : '--'),
                             style: const TextStyle(
                               fontSize: 18,
                               fontWeight: FontWeight.bold,
@@ -329,9 +341,11 @@ class ContributionPage extends ConsumerWidget {
 
   Widget _buildContributionDetailCard(
     BuildContext context,
+    WidgetRef ref,
     Contribution? contribution,
     bool isLoading,
   ) {
+    final hideAmounts = ref.watch(hideAmountsProvider);
     return Container(
       padding: const EdgeInsets.all(20),
       decoration: BoxDecoration(
@@ -374,6 +388,7 @@ class ContributionPage extends ConsumerWidget {
                   title: '本人种植',
                   subtitle: '个人认种榴莲树产生的贡献值',
                   amount: contribution?.personalContribution ?? '0',
+                  hideAmounts: hideAmounts,
                 ),
                 const Divider(height: 24),
                 _buildDetailSummaryRow(
@@ -382,6 +397,7 @@ class ContributionPage extends ConsumerWidget {
                   title: '团队层级',
                   subtitle: '直推及间推用户认种产生的贡献值',
                   amount: contribution?.teamLevelContribution ?? '0',
+                  hideAmounts: hideAmounts,
                 ),
                 const Divider(height: 24),
                 _buildDetailSummaryRow(
@@ -390,6 +406,7 @@ class ContributionPage extends ConsumerWidget {
                   title: '团队奖励',
                   subtitle: '满足条件后获得的额外奖励贡献值',
                   amount: contribution?.teamBonusContribution ?? '0',
+                  hideAmounts: hideAmounts,
                 ),
               ],
             ),
@@ -445,6 +462,7 @@ class ContributionPage extends ConsumerWidget {
     required String title,
     required String subtitle,
     required String amount,
+    required bool hideAmounts,
   }) {
     return Row(
       children: [
@@ -475,7 +493,7 @@ class ContributionPage extends ConsumerWidget {
           ),
         ),
         Text(
-          formatAmount(amount),
+          hideAmounts ? '****' : formatAmount(amount),
           style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold, color: _green),
         ),
       ],

frontend/mining-app/lib/presentation/providers/contribution_providers.dart

@@ -173,3 +173,6 @@ final estimatedEarningsProvider = Provider.family<EstimatedEarnings, String>((re
     isValid: true,
   );
 });
+
+/// 控制是否隐藏金额显示的状态
+final hideAmountsProvider = StateProvider<bool>((ref) => false);