refactor(class): 优化接口请求与页面细节

1. 统一处理后端统一包结构，自动解析data字段
2. 新增点赞评论栏显示控制参数，详情页隐藏该栏
3. 简化详情页数据更新逻辑，对齐Vue版本实现
4. 重构确认弹窗组件，优化样式与弹窗尺寸
5. 为评论项添加水平边距，优化列表排版

lib/core/api/class/api.dart

@@ -113,11 +113,16 @@ class ClassApi {
   }
 
   /// 动态详情（含全量留言 / 点赞头像）—— GET /api/v1/UserPost/GetUserPostDetail/{id}
+  ///
+  /// 后端统一包 {code, data} 结构，需取 data 内层再解析（对标 Vue request 拦截器自动解包）。
   Future<UserPostDto> getUserPostDetail(int id) async {
-    final data = await DioClient.instance.get(
+    final raw = await DioClient.instance.get(
       '/api/v1/UserPost/GetUserPostDetail/$id',
     );
-    return UserPostDto.fromJson(data as Map<String, dynamic>);
+    final data = raw is Map<String, dynamic> && raw['data'] is Map<String, dynamic>
+        ? raw['data'] as Map<String, dynamic>
+        : raw as Map<String, dynamic>;
+    return UserPostDto.fromJson(data);
   }
 
   /// 删除评论 —— DELETE /api/v1/UserPost/DeleteUserCommon/{id}

lib/core/components/confirm_box.dart

@@ -29,6 +29,8 @@ Future<bool> showConfirmBox(
   bool showCancel = true,
   double? minWidth, // 弹窗最小宽度（逻辑像素，调用方自行 .w 换算）
 }) {
+  // 默认弹窗固定宽度 310.w（按钮 135.w × 2 + 间距 10.w + 左右 15.w×2 = 310.w）
+  minWidth ??= 310.w;
   return showDialog<bool>(
     context: context,
     barrierDismissible: true, // 点遮罩关闭 → false（对标 onPopupClose）
@@ -66,15 +68,18 @@ class ConfirmBox extends StatelessWidget {
   Widget build(BuildContext context) {
     return Dialog(
       backgroundColor: Colors.transparent,
+      // Dialog 默认左右 insetPadding: 40 太宽，310.w 在手机上放不下
+      // 这里减到 20，给 310.w 固定宽度留足空间（375-40=335 > 310）
+      insetPadding: EdgeInsets.symmetric(horizontal: 20.w),
       child: Container(
-        padding: EdgeInsets.symmetric(vertical: 30.w, horizontal: 15.w), // 60rpx 30rpx
+        width: minWidth, // 固定宽度（minWidth 语义变了：这里就是固定宽）
-        constraints:
+        padding: EdgeInsets.symmetric(vertical: 30.w, horizontal: 15.w),
-            minWidth != null ? BoxConstraints(minWidth: minWidth!) : null,
         decoration: BoxDecoration(
           borderRadius: BorderRadius.circular(20.w), // 40rpx
           image: DecorationImage(
             image: NetworkImage(
-                ImgUrl.build('/StaticResource/2026-03-31/header-bac.png')),
+              ImgUrl.build('/StaticResource/2026-03-31/header-bac.png'),
+            ),
             fit: BoxFit.fill, // background-size: 100% 100%
           ),
         ),
@@ -94,7 +99,9 @@ class ConfirmBox extends StatelessWidget {
               Padding(
                 padding: EdgeInsets.only(top: 18.w), // 36rpx
                 child: ConstrainedBox(
-                  constraints: BoxConstraints(maxWidth: 263.w), // max-width 526rpx
+                  constraints: BoxConstraints(
+                    maxWidth: 263.w,
+                  ), // max-width 526rpx
                   child: Text(
                     content,
                     style: TextStyle(
@@ -115,6 +122,7 @@ class ConfirmBox extends StatelessWidget {
                       backgroundColor: const Color(0xFFFDFFFF),
                       textColor: const Color(0xFF6195F6),
                       onTap: () => Navigator.of(context).pop(false),
+                      isConfirm: false,
                     ),
                     SizedBox(width: 10.w), // 20rpx
                   ],
@@ -133,6 +141,7 @@ class ConfirmBox extends StatelessWidget {
                     ),
                     textColor: Colors.white,
                     onTap: () => Navigator.of(context).pop(true),
+                    isConfirm: true,
                   ),
                 ],
               ),
@@ -143,40 +152,45 @@ class ConfirmBox extends StatelessWidget {
     );
   }
 
-  /// 胶囊按钮（对标 default-button5 渐变确定键 / default-button6 白底取消键）
+  /// 胶囊按钮：取消键（白底+蓝字+边框+阴影）/ 确定键（渐变+边框+阴影）
   Widget _buildButton({
     required String text,
     required Color textColor,
     required VoidCallback onTap,
+    required bool isConfirm,
     Color? backgroundColor,
     Gradient? gradient,
   }) {
     return GestureDetector(
       onTap: onTap,
       child: Container(
-        height: 46.w, // 92rpx
+        width: 135.w,
-        padding: EdgeInsets.symmetric(horizontal: 20.w),
+        height: 49.w,
-        constraints: BoxConstraints(minWidth: 135.w), // min-width 270rpx
         alignment: Alignment.center,
         decoration: BoxDecoration(
           color: backgroundColor,
           gradient: gradient,
-          borderRadius: BorderRadius.circular(100), // border-radius: 100px
+          borderRadius: BorderRadius.circular(50.w),
-          boxShadow: gradient != null
+          boxShadow: [
-              ? [
+            if (isConfirm)
-                  // CSS: 0px 15px 11.3px rgba(61,125,245,0.08)
-                  // （inset 内发光 Flutter 不支持，省略）
               BoxShadow(
-                    color: const Color(0x143D7DF5),
+                color: Colors.black.withValues(alpha: 0.25),
-                    offset: Offset(0, 15.w),
+                offset: Offset(0, 1.w),
-                    blurRadius: 11.w,
+                blurRadius: 9.2.w,
+                spreadRadius: 3.w,
+              )
+            else
+              BoxShadow(
+                color: Colors.black.withValues(alpha: 0.25),
+                offset: Offset(0, 2.w),
+                blurRadius: 12.2.w,
+                spreadRadius: 0.5.w,
               ),
-                ]
+          ],
-              : null,
         ),
         child: Text(
           text,
-          style: TextStyle(fontSize: 16.sp, color: textColor), // 32rpx
+          style: TextStyle(fontSize: 16.sp, color: textColor),
         ),
       ),
     );

lib/features/class/my_update_detail_page.dart

@@ -4,6 +4,7 @@ import 'package:flutter_screenutil/flutter_screenutil.dart';
 import 'package:go_router/go_router.dart';
 import 'package:new_learn/core/api/class/api.dart';
 import 'package:new_learn/core/api/class/model.dart';
+import 'package:new_learn/core/components/confirm_box.dart';
 import 'package:new_learn/core/components/user_circle_avatar.dart';
 import 'package:new_learn/core/providers/user_provider.dart';
 import 'package:new_learn/core/utils/img_url.dart';
@@ -41,30 +42,19 @@ class _MyUpdateDetailPageState extends ConsumerState<MyUpdateDetailPage> {
 
   /// 用详情接口增量更新评论相关字段（对标 Vue fetchDetail）
   ///
-  /// 关键：只有当 detail 确实带增量内容时才更新，且单个字段非空才覆盖。
+  /// 简化逻辑：接口成功返回就直接用详情数据覆盖评论相关字段，
-  /// 否则后端未返回评论/计数（空壳）时，会把列表带入的正确数据"清空"
+  /// 和 Vue 版一致（Vue 里 res.commons !== undefined 就直接覆盖）。
-  /// —— 表现为初次闪现对的数据后瞬间空白。
   Future<void> _fetchDetail() async {
     try {
       final res = await ClassApi.instance.getUserPostDetail(_post.id);
       if (!mounted) return;
-      // 空壳判定：detail 未携带任何有效增量 → 完全信任列表带入的数据，不更新
-      final hasDetail =
-          res.commons.isNotEmpty ||
-          res.userLikeAvatars.isNotEmpty ||
-          res.replyCount > 0 ||
-          res.likeCount > 0 ||
-          res.userLikeStatus;
-      if (!hasDetail) return;
       setState(() {
         _post = _post.copyWith(
-          commons: res.commons.isNotEmpty ? res.commons : _post.commons,
+          commons: res.commons,
-          userLikeAvatars: res.userLikeAvatars.isNotEmpty
+          userLikeAvatars: res.userLikeAvatars,
-              ? res.userLikeAvatars
-              : _post.userLikeAvatars,
           userLikeStatus: res.userLikeStatus,
-          replyCount: res.replyCount > 0 ? res.replyCount : _post.replyCount,
+          replyCount: res.replyCount,
-          likeCount: res.likeCount > 0 ? res.likeCount : _post.likeCount,
+          likeCount: res.likeCount,
         );
       });
     } catch (_) {
@@ -158,6 +148,7 @@ class _MyUpdateDetailPageState extends ConsumerState<MyUpdateDetailPage> {
                   onLike: _toggleLike,
                   onComment: (_) {},
                   hasCardBackground: false,
+                  showLikeCommentBar: false,
                 ),
                 _DetailComments(post: _post, onDelete: _deleteComment),
               ],
@@ -199,22 +190,10 @@ class _DetailCommentsState extends ConsumerState<_DetailComments> {
       _active = null;
       _pending = index;
     });
-    final ok = await showDialog<bool>(
+    final ok = await showConfirmBox(
-      context: context,
+      context,
-      builder: (ctx) => AlertDialog(
+      title: '是否删除评论',
-        title: const Text('是否删除评论'),
+      content: '删除评论后将不可恢复，请慎重选择！',
-        content: const Text('删除评论后将不可恢复，请慎重选择！'),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.pop(ctx, false),
-            child: const Text('取消'),
-          ),
-          TextButton(
-            onPressed: () => Navigator.pop(ctx, true),
-            child: const Text('确定'),
-          ),
-        ],
-      ),
     );
     if (!mounted) return;
     setState(() => _pending = null);
@@ -287,7 +266,12 @@ class _DetailCommentsState extends ConsumerState<_DetailComments> {
       );
     } else {
       for (int i = 0; i < _post.commons.length; i++) {
-        items.add(_commentItem(_post.commons[i], i, myId));
+        items.add(
+          Padding(
+            padding: EdgeInsets.symmetric(horizontal: 16.w),
+            child: _commentItem(_post.commons[i], i, myId),
+          ),
+        );
       }
     }
     items.add(SizedBox(height: 16.h));

lib/features/class/widgets/class_update_widgets.dart

@@ -28,6 +28,7 @@ class PostCard extends StatelessWidget {
     required this.onComment,
     this.showCommentComposer = true,
     this.hasCardBackground = true,
+    this.showLikeCommentBar = true,
   });
 
   final UserPostDto post;
@@ -40,6 +41,9 @@ class PostCard extends StatelessWidget {
   /// 是否显示白色卡片背景（列表页 true；详情页与留言区共用一张大卡片 → false）
   final bool hasCardBackground;
 
+  /// 是否显示点赞/评论标记栏（列表页 true；详情页不需要 → false）
+  final bool showLikeCommentBar;
+
   String get _avatar {
     final url = ImgUrl.build(post.avatar);
     return url.isEmpty
@@ -96,6 +100,7 @@ class PostCard extends StatelessWidget {
                 AlbumGrid(urls: post.urls.map(ImgUrl.build).toList()),
               ],
               SizedBox(height: 10.h),
+              if (showLikeCommentBar)
                 LikeCommentBar(
                   post: post,
                   onLike: onLike,