新增：互动埋点与乐观更新视觉基建——字典 v3 互动八事件封装 + ToggleSync 成功上报与触点归因 + LikeButton 三层闪烁抑制动画（T3-16）

- community_interaction_analytics：post_liked/unliked、post_favorited/unfavorited、
  comment_create_succeeded/failed、user_followed/unfollowed 强类型封装（22 号
  白名单键集逐一对齐；textLengthBucket 分桶、httpStatus 由五位码推导、
  会话失效不上报）；comment_create_started 锁死 unknown 不封装
- CommunityController：toggleLike/toggleBookmark 增 source 触点归因
 （feed / post_detail），成功响应后经注入的 interactionAnalytics 上报
 （乐观翻转与失败不报）；adjustCommentCount 评论计数同源写入
 （详情副本与 Feed 卡片一并更新）
- LikeButton 升 Stateful：点按激活 240ms 弹性缩放 + 120ms 图标淡入、
  取消仅颜色渐出；回滚/对账零动画直接跳变、计数与状态成对更新、
  激活动画未播完等播完再跳（05 号 §3.5/§4）；减弱动态设置降级瞬变

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

lib/features/community/community_controller.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/foundation.dart';
 import 'package:patbond_flutter/core/network/api_exception.dart';
+import 'package:patbond_flutter/features/community/community_interaction_analytics.dart';
 import 'package:patbond_flutter/features/community/community_models.dart';
 import 'package:patbond_flutter/features/community/community_repository.dart';
 import 'package:patbond_flutter/features/community/toggle_sync.dart';
@@ -18,7 +19,7 @@ enum LoadMorePhase { idle, loading, error }
 /// 评论列表只属详情页，按「页面级状态按页自建」纪律经 [repository]
 /// 自取，不膨胀本控制器。服务端是唯一事实来源，内存副本仅作展示缓存。
 class CommunityController extends ChangeNotifier {
-  CommunityController({required this._repository}) {
+  CommunityController({required this._repository, this._interactionAnalytics}) {
     _likeSync = ToggleSync(
       read: (id) {
         final post = _postCache[id];
@@ -35,6 +36,11 @@ class CommunityController extends ChangeNotifier {
         final state = target
             ? await _repository.likePost(id)
             : await _repository.unlikePost(id);
+        // 成功响应后上报（06 §1.4 口径；乐观翻转与失败均不报）。
+        final source = _likeSources[id] ?? InteractionSource.feed;
+        target
+            ? _interactionAnalytics?.postLiked(source: source)
+            : _interactionAnalytics?.postUnliked(source: source);
         return ToggleOutcome(active: state.liked, count: state.likeCount);
       },
       generation: () => _generation,
@@ -62,6 +68,10 @@ class CommunityController extends ChangeNotifier {
         final state = target
             ? await _repository.bookmarkPost(id)
             : await _repository.unbookmarkPost(id);
+        final source = _bookmarkSources[id] ?? InteractionSource.feed;
+        target
+            ? _interactionAnalytics?.postFavorited(source: source)
+            : _interactionAnalytics?.postUnfavorited(source: source);
         return ToggleOutcome(
           active: state.bookmarked,
           count: state.bookmarkCount,
@@ -73,6 +83,12 @@ class CommunityController extends ChangeNotifier {
   }
 
   final CommunityRepository _repository;
+  final CommunityInteractionAnalytics? _interactionAnalytics;
+
+  /// 各帖最近一次 toggle 的触点来源（Feed 卡片 / 详情页共享同一实例，
+  /// 成功响应上报时按发起触点归因）。
+  final Map<String, InteractionSource> _likeSources = {};
+  final Map<String, InteractionSource> _bookmarkSources = {};
 
   /// 页面级状态（评论列表、我的帖子、收藏页等）按页直接经仓库取数。
   CommunityRepository get repository => _repository;
@@ -193,10 +209,34 @@ class CommunityController extends ChangeNotifier {
   }
 
   /// 点赞/取消点赞（乐观翻转，终态由 [ToggleSync] 对账收敛，不外抛）。
-  void toggleLike(String postId) => _likeSync.toggle(postId);
+  /// [source] 为触点来源（埋点归因），Feed 卡片缺省 feed、详情页传
+  /// post_detail。
+  void toggleLike(
+    String postId, {
+    InteractionSource source = InteractionSource.feed,
+  }) {
+    _likeSources[postId] = source;
+    _likeSync.toggle(postId);
+  }
 
   /// 收藏/取消收藏（与点赞同构）。
-  void toggleBookmark(String postId) => _bookmarkSync.toggle(postId);
+  void toggleBookmark(
+    String postId, {
+    InteractionSource source = InteractionSource.feed,
+  }) {
+    _bookmarkSources[postId] = source;
+    _bookmarkSync.toggle(postId);
+  }
+
+  /// 评论创建/删除后的计数调整（详情页与 Feed 卡片同源写入，
+  /// 服务端 comment_count 由写侧同事务维护，本地只做展示对齐）。
+  void adjustCommentCount(String postId, int delta) {
+    final current =
+        _postCache[postId]?.commentCount ?? _cardOrNull(postId)?.commentCount;
+    if (current == null) return;
+    final next = current + delta;
+    _writeInteraction(postId, commentCount: next < 0 ? 0 : next);
+  }
 
   /// 消费一次性 toggle 错误（SnackBar 展示后清除）。
   void clearToggleError() => _toggleError = null;
@@ -215,6 +255,8 @@ class CommunityController extends ChangeNotifier {
     _loadMoreError = null;
     _toggleError = null;
     _postCache.clear();
+    _likeSources.clear();
+    _bookmarkSources.clear();
     _likeSync.reset();
     _bookmarkSync.reset();
     _notify();
@@ -234,6 +276,7 @@ class CommunityController extends ChangeNotifier {
     int? likeCount,
     bool? bookmarkedByMe,
     int? bookmarkCount,
+    int? commentCount,
   }) {
     final post = _postCache[postId];
     if (post != null) {
@@ -242,6 +285,7 @@ class CommunityController extends ChangeNotifier {
         likeCount: likeCount,
         bookmarkedByMe: bookmarkedByMe,
         bookmarkCount: bookmarkCount,
+        commentCount: commentCount,
       );
     }
     final index = _feed.indexWhere((card) => card.id == postId);
@@ -252,6 +296,7 @@ class CommunityController extends ChangeNotifier {
           likeCount: likeCount,
           bookmarkedByMe: bookmarkedByMe,
           bookmarkCount: bookmarkCount,
+          commentCount: commentCount,
         );
     }
     if (post != null || index != -1) _notify();