feat(mobile-app): 引荐列表支持展开/收拢功能

- 初始只显示前10条引荐记录
- 超过10人时显示"..."按钮可点击展开全部
- 展开后显示"收起"按钮可点击收拢
- 加载更多时显示loading指示器

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

frontend/mobile-app/lib/features/profile/presentation/pages/profile_page.dart

@@ -66,6 +66,9 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
 
   // 直推数据（从 referral-service 获取）
   List<Map<String, dynamic>> _referrals = [];
+  int _totalReferralCount = 0;           // 直推总人数
+  bool _isReferralListExpanded = false;  // 引荐列表是否展开
+  bool _isLoadingMoreReferrals = false;  // 是否正在加载更多引荐
 
   // 团队树根节点（缓存以保持展开状态）
   TeamTreeNode? _teamTreeRootNode;
@@ -401,6 +404,8 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
             'personal': r.personalPlantingCount,  // 个人认种量
             'team': r.teamPlantingCount,          // 团队认种量
           }).toList();
+          _totalReferralCount = directReferrals.total;  // 保存总数
+          _isReferralListExpanded = false;  // 重置展开状态
         });
       }
     } catch (e, stackTrace) {
@@ -422,6 +427,46 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
     }
   }
 
+  /// 展开引荐列表（加载全部数据）
+  Future<void> _expandReferralList() async {
+    if (_isLoadingMoreReferrals) return;
+
+    setState(() {
+      _isLoadingMoreReferrals = true;
+    });
+
+    try {
+      final referralService = ref.read(referralServiceProvider);
+      final response = await referralService.getDirectReferrals(limit: 200);
+
+      if (mounted) {
+        setState(() {
+          _referrals = response.referrals.map((r) => <String, dynamic>{
+            'serial': r.accountSequence,
+            'personal': r.personalPlantingCount,
+            'team': r.teamPlantingCount,
+          }).toList();
+          _isReferralListExpanded = true;
+          _isLoadingMoreReferrals = false;
+        });
+      }
+    } catch (e) {
+      debugPrint('[ProfilePage] 加载更多引荐失败: $e');
+      if (mounted) {
+        setState(() {
+          _isLoadingMoreReferrals = false;
+        });
+      }
+    }
+  }
+
+  /// 收拢引荐列表（只显示前10条）
+  void _collapseReferralList() {
+    setState(() {
+      _isReferralListExpanded = false;
+    });
+  }
+
   /// 加载授权数据 (from authorization-service)
   /// [isRefresh] 是否为刷新操作（刷新时不显示加载状态）
   Future<void> _loadAuthorizationData({bool isRefresh = false}) async {
@@ -3349,6 +3394,11 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
 
   /// 构建引荐列表
   Widget _buildReferralList() {
+    // 决定显示多少条
+    final displayList = _isReferralListExpanded
+        ? _referrals
+        : _referrals.take(10).toList();
+
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
@@ -3366,7 +3416,7 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
           ),
         ),
         const SizedBox(height: 8),
-        ..._referrals.map((referral) => Padding(
+        ...displayList.map((referral) => Padding(
           padding: const EdgeInsets.only(bottom: 4),
           child: Container(
             padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
@@ -3399,6 +3449,46 @@ class _ProfilePageState extends ConsumerState<ProfilePage> {
             ),
           ),
         )),
+        // 展开/收拢按钮
+        if (_totalReferralCount > 10)
+          Padding(
+            padding: const EdgeInsets.only(top: 4),
+            child: GestureDetector(
+              onTap: _isLoadingMoreReferrals
+                  ? null
+                  : (_isReferralListExpanded
+                      ? _collapseReferralList
+                      : _expandReferralList),
+              child: Container(
+                width: double.infinity,
+                padding: const EdgeInsets.symmetric(vertical: 8),
+                decoration: BoxDecoration(
+                  color: const Color(0xCCFFF5E6),
+                  borderRadius: BorderRadius.circular(8),
+                ),
+                child: Center(
+                  child: _isLoadingMoreReferrals
+                      ? const SizedBox(
+                          width: 16,
+                          height: 16,
+                          child: CircularProgressIndicator(
+                            strokeWidth: 2,
+                            color: Color(0xFF5D4037),
+                          ),
+                        )
+                      : Text(
+                          _isReferralListExpanded ? '收起' : '...',
+                          style: const TextStyle(
+                            fontSize: 14,
+                            fontFamily: 'Inter',
+                            fontWeight: FontWeight.w500,
+                            color: Color(0xFF5D4037),
+                          ),
+                        ),
+                ),
+              ),
+            ),
+          ),
       ],
     );
   }