fix(ledger): REWARD_EXPIRED条目显示权益类型+已过期标签

- 奖励过期条目显示具体权益名（分享权益/省团队权益等）+ 红色"已过期"标签
- 图标改为灰色 timer_off，金额文字改为灰色，背景微灰
- 与正常权益收入条目有明显视觉区分

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

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

@@ -940,21 +940,36 @@ class _LedgerDetailPageState extends ConsumerState<LedgerDetailPage>
   /// 构建流水项
   Widget _buildLedgerItem(LedgerEntry entry) {
     final isIncome = entry.isIncome;
+    final bool isExpiredReward = entry.entryType == 'REWARD_EXPIRED';
     // 可点击查看详情的类型：认种支付、权益分配、结算、提现、转入、转出
     final bool isPlantPayment = entry.entryType == 'PLANT_PAYMENT' && entry.refOrderId != null;
-    final bool isRewardEntry = entry.allocationType != null;
+    final bool isRewardEntry = entry.allocationType != null && !isExpiredReward;
     final bool isSettlementEntry = entry.entryType == 'REWARD_SETTLED';
     final bool isWithdrawalEntry = entry.entryType == 'WITHDRAWAL';
     final bool isTransferEntry = entry.entryType == 'TRANSFER_IN' || entry.entryType == 'TRANSFER_OUT';
     final bool isClickable = isPlantPayment || isRewardEntry || isSettlementEntry || isWithdrawalEntry || isTransferEntry;
 
+    // 奖励过期条目：图标用灰色 timer_off，标题显示权益类型 + "已过期"标签
+    final Color iconBgColor = isExpiredReward
+        ? const Color(0x1A9E9E9E)
+        : (isIncome ? const Color(0x1A4CAF50) : const Color(0x1AE53935));
+    final Color iconColor = isExpiredReward
+        ? const Color(0xFF9E9E9E)
+        : (isIncome ? const Color(0xFF4CAF50) : const Color(0xFFE53935));
+    final IconData iconData = isExpiredReward
+        ? Icons.timer_off_outlined
+        : (isIncome ? Icons.arrow_downward : Icons.arrow_upward);
+
+    // 过期条目标题：优先显示权益类型名（如"分享权益"），无则显示"奖励"
+    final String expiredTitle = entry.allocationTypeName ?? '奖励';
+
     return GestureDetector(
       onTap: isClickable ? () => _showEntryDetail(entry) : null,
       child: Container(
         margin: const EdgeInsets.only(bottom: 8),
         padding: const EdgeInsets.all(16),
         decoration: BoxDecoration(
-          color: Colors.white,
+          color: isExpiredReward ? const Color(0xFFFAFAFA) : Colors.white,
           borderRadius: BorderRadius.circular(12),
           boxShadow: [
             BoxShadow(
@@ -971,16 +986,10 @@ class _LedgerDetailPageState extends ConsumerState<LedgerDetailPage>
               width: 40,
               height: 40,
               decoration: BoxDecoration(
-                color: isIncome
-                    ? const Color(0x1A4CAF50)
-                    : const Color(0x1AE53935),
+                color: iconBgColor,
                 borderRadius: BorderRadius.circular(10),
               ),
-              child: Icon(
-                isIncome ? Icons.arrow_downward : Icons.arrow_upward,
-                size: 20,
-                color: isIncome ? const Color(0xFF4CAF50) : const Color(0xFFE53935),
-              ),
+              child: Icon(iconData, size: 20, color: iconColor),
             ),
             const SizedBox(width: 12),
             // 类型和时间
@@ -988,6 +997,32 @@ class _LedgerDetailPageState extends ConsumerState<LedgerDetailPage>
               child: Column(
                 crossAxisAlignment: CrossAxisAlignment.start,
                 children: [
+                  if (isExpiredReward) ...[
+                    Row(
+                      children: [
+                        Text(
+                          expiredTitle,
+                          style: const TextStyle(
+                            fontSize: 14,
+                            fontWeight: FontWeight.w500,
+                            color: Color(0xFF9E9E9E),
+                          ),
+                        ),
+                        const SizedBox(width: 6),
+                        Container(
+                          padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 1),
+                          decoration: BoxDecoration(
+                            color: const Color(0x1AE53935),
+                            borderRadius: BorderRadius.circular(4),
+                          ),
+                          child: const Text(
+                            '已过期',
+                            style: TextStyle(fontSize: 10, color: Color(0xFFE53935)),
+                          ),
+                        ),
+                      ],
+                    ),
+                  ] else ...[
                     Text(
                       entry.displayName,
                       style: const TextStyle(
@@ -996,6 +1031,7 @@ class _LedgerDetailPageState extends ConsumerState<LedgerDetailPage>
                         color: Color(0xFF5D4037),
                       ),
                     ),
+                  ],
                   const SizedBox(height: 4),
                   Text(
                     _formatDate(entry.createdAt),
@@ -1021,7 +1057,9 @@ class _LedgerDetailPageState extends ConsumerState<LedgerDetailPage>
                       style: TextStyle(
                         fontSize: 16,
                         fontWeight: FontWeight.w700,
-                        color: isIncome ? const Color(0xFF4CAF50) : const Color(0xFFE53935),
+                        color: isExpiredReward
+                            ? const Color(0xFF9E9E9E)
+                            : (isIncome ? const Color(0xFF4CAF50) : const Color(0xFFE53935)),
                       ),
                     ),
                   ),