升级帖子编辑与 Feed 体验：TipTap 富文本、修订历史、排序与编辑时限。

将 Markdown 编辑器替换为 TipTap WYSIWYG，新增帖子修订记录与 diff 展示；首页支持最新/回复排序与本地缓存；后台可配置编辑时限与锁定帖子；侧边栏整合板块导航并优化 Feed 布局。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/components/FeedHeader.tsx

@@ -1,8 +1,5 @@
-import { Button } from '@/components/ui/button';
-import { Plus, Settings } from 'lucide-react';
 import { useNavigate } from 'react-router-dom';
 import type { Board, ForumStats } from '../api/types';
-import { useAuth } from '../hooks/useAuth';
 
 interface Props {
   boardId: number;
@@ -14,55 +11,40 @@ interface Props {
 
 export default function FeedHeader({ boardId, keyword, boards, stats, postTotal }: Props) {
   const nav = useNavigate();
-  const { user, loading: authLoading } = useAuth();
   const board = boards.find(b => b.id === boardId);
 
   const title = keyword
     ? `搜索：${keyword}`
     : (boardId && board ? board.name : '全部帖子');
 
-  const hint = keyword
-    ? `找到 ${postTotal} 篇相关帖子`
-    : boardId && board
-      ? (board.description || '欢迎在本板块交流讨论')
-      : '姜十三论坛 · 拾三一隅，自在交流';
+  const boardHint = boardId && board ? (board.description || '') : '';
 
   return (
-    <div className="feed-banner">
-      <div className="feed-banner-row">
-        <div className="feed-banner-title">
-          <h2>{title}</h2>
-          <p>{hint}</p>
-        </div>
-        {!keyword && (
-          <div className="feed-actions flex flex-wrap items-center gap-2">
-            {authLoading ? (
-              <span className="feed-action-slot" aria-hidden />
-            ) : user ? (
-              <Button
-                size="sm"
-                onClick={() => nav(boardId ? `/compose?board=${boardId}` : '/compose')}
-              >
-                <Plus />
-                {boardId ? '在此发帖' : '发布帖子'}
-              </Button>
-            ) : (
-              <Button size="sm" onClick={() => nav('/login')}>登录参与</Button>
-            )}
-            {!authLoading && user?.role === 'admin' && (
-              <Button size="sm" variant="outline" onClick={() => nav('/admin/boards')}>
-                <Settings />
-                管理板块
-              </Button>
-            )}
-          </div>
+    <div className={`feed-head${keyword ? ' feed-head--solo' : ''}`}>
+      <div className="feed-head__title">
+        <h2 title={boardHint || undefined}>{title}</h2>
+        {!keyword && stats && (
+          <span className="feed-head__meta">
+            会员 <strong>{stats.users}</strong>
+            <span className="feed-head__dot" aria-hidden>·</span>
+            帖子 <strong>{stats.posts}</strong>
+            <span className="feed-head__dot" aria-hidden>·</span>
+            板块 <strong>{stats.boards}</strong>
+          </span>
         )}
       </div>
-      <div className="feed-stats">
-        <span>会员 <strong>{stats?.users ?? '—'}</strong></span>
-        <span>帖子 <strong>{stats?.posts ?? '—'}</strong></span>
-        <span>板块 <strong>{stats?.boards ?? '—'}</strong></span>
-      </div>
+      {keyword && (
+        <button
+          type="button"
+          className="feed-head__clear"
+          onClick={() => nav('/')}
+        >
+          清除搜索
+        </button>
+      )}
+      {keyword && (
+        <span className="feed-toolbar__count">共 {postTotal} 条</span>
+      )}
     </div>
   );
 }