feat(mining-app): 兑换页面"流通池"改名及"已销毁量"点击查看销毁明细

1. 将市场数据卡片中的"流通池"标签改名为"已分配积分股"
   - 展示值不变，仍为 totalMined（全网已挖矿产出总量）

2. "已销毁量"新增点击交互，点击弹出"销毁明细"对话框：
   - 系统总销毁量（blackHoleAmount）：当前页面已展示的黑洞销毁总量
   - 全网兑换销毁量（circulationPool）：卖出交易实际产生的流通池金额
   - 标签旁显示 info_outline 图标提示可点击

3. 重构 _buildMarketDataItem，拆分出 _buildMarketDataItemContent：
   - _buildMarketDataItem：包含 Expanded 包裹，供普通数据项使用
   - _buildMarketDataItemContent：纯内容组件，支持 showTapHint 参数
   - 避免 Row > GestureDetector > Expanded 的布局冲突

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/mining-app/lib/presentation/pages/trading/trading_page.dart

@@ -366,7 +366,7 @@ class _TradingPageState extends ConsumerState<TradingPage> {
               // 流通池：显示全网已挖矿产出的积分股总量（totalMined），
               // 而非交易流通池（circulationPool，目前无交易故为0）
               _buildMarketDataItem(
-                '流通池',
+                '已分配积分股',
                 market != null ? formatCompact(market.totalMined) : null,
                 _orange,
                 isLoading,
@@ -386,11 +386,18 @@ class _TradingPageState extends ConsumerState<TradingPage> {
               ),
               Container(width: 1, height: 24, color: bgGray),
               const SizedBox(width: 16),
-              _buildMarketDataItem(
+              Expanded(
-                '已销毁量',
+                child: GestureDetector(
-                market != null ? formatIntWithCommas(market.blackHoleAmount) : null,
+                  behavior: HitTestBehavior.opaque,
-                _red,
+                  onTap: market != null ? () => _showBurnDetailDialog(market) : null,
-                isLoading,
+                  child: _buildMarketDataItemContent(
+                    '已销毁量',
+                    market != null ? formatIntWithCommas(market.blackHoleAmount) : null,
+                    _red,
+                    isLoading,
+                    showTapHint: true,
+                  ),
+                ),
               ),
             ],
           ),
@@ -401,26 +408,83 @@ class _TradingPageState extends ConsumerState<TradingPage> {
 
   Widget _buildMarketDataItem(String label, String? value, Color valueColor, bool isLoading) {
     return Expanded(
-      child: Column(
+      child: _buildMarketDataItemContent(label, value, valueColor, isLoading),
-        crossAxisAlignment: CrossAxisAlignment.start,
+    );
-        children: [
+  }
-          Text(label, style: TextStyle(fontSize: 12, color: AppColors.textSecondaryOf(context))),
+
-          const SizedBox(height: 4),
+  Widget _buildMarketDataItemContent(String label, String? value, Color valueColor, bool isLoading, {bool showTapHint = false}) {
-          DataText(
+    return Column(
-            data: value,
+      crossAxisAlignment: CrossAxisAlignment.start,
-            isLoading: isLoading,
+      children: [
-            placeholder: '--,---,---',
+        Row(
-            style: TextStyle(
+          mainAxisSize: MainAxisSize.min,
-              fontSize: 14,
+          children: [
-              fontWeight: FontWeight.bold,
+            Text(label, style: TextStyle(fontSize: 12, color: AppColors.textSecondaryOf(context))),
-              color: valueColor,
+            if (showTapHint) ...[
-            ),
+              const SizedBox(width: 4),
+              Icon(Icons.info_outline, size: 14, color: AppColors.textSecondaryOf(context)),
+            ],
+          ],
+        ),
+        const SizedBox(height: 4),
+        DataText(
+          data: value,
+          isLoading: isLoading,
+          placeholder: '--,---,---',
+          style: TextStyle(
+            fontSize: 14,
+            fontWeight: FontWeight.bold,
+            color: valueColor,
+          ),
+        ),
+      ],
+    );
+  }
+
+  void _showBurnDetailDialog(MarketOverview market) {
+    final darkText = AppColors.textPrimaryOf(context);
+    final grayText = AppColors.textSecondaryOf(context);
+
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(16)),
+        backgroundColor: AppColors.cardOf(context),
+        title: Text(
+          '销毁明细',
+          style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold, color: darkText),
+        ),
+        content: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            _buildBurnDetailRow('系统总销毁量', formatIntWithCommas(market.blackHoleAmount), darkText, grayText),
+            const SizedBox(height: 16),
+            _buildBurnDetailRow('全网兑换销毁量', formatIntWithCommas(market.circulationPool), darkText, grayText),
+          ],
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(),
+            child: const Text('关闭'),
           ),
         ],
       ),
     );
   }
 
+  Widget _buildBurnDetailRow(String label, String value, Color textColor, Color labelColor) {
+    return Row(
+      mainAxisAlignment: MainAxisAlignment.spaceBetween,
+      children: [
+        Text(label, style: TextStyle(fontSize: 14, color: labelColor)),
+        Text(
+          value,
+          style: TextStyle(fontSize: 14, fontWeight: FontWeight.bold, color: textColor),
+        ),
+      ],
+    );
+  }
+
   Widget _buildTradingPanel(AsyncValue<PriceInfo?> priceAsync) {
     final priceInfo = priceAsync.valueOrNull;
     final currentPrice = priceInfo?.price ?? '0';