增加 @提及、搜索筛选与找回密码，并将右栏热门改为正在聊。

补齐评论提及补全与通知、按作者/板块/仅标题搜索，以及邮箱验证码重置密码；同时修复 Go 提及正则并优化侧栏悬停样式。

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

frontend/src/components/CommentContent.tsx

@@ -1,17 +1,53 @@
+import { useNavigate } from 'react-router-dom';
+import { api } from '../api/client';
 import { highlightMentions } from '../utils/content';
+import { userPath } from '../utils/userPath';
 
 interface Props {
   content: string;
-  onMentionClick?: (name: string) => void;
 }
 
-/** 渲染评论正文（支持正文内 @ 高亮） */
-export default function CommentContent({ content, onMentionClick }: Props) {
+/** 渲染评论正文（支持正文内 @ 高亮与点击跳转） */
+export default function CommentContent({ content }: Props) {
+  const nav = useNavigate();
+
+  const openMention = async (name: string) => {
+    try {
+      const r = await api.searchUsers(name, 5);
+      const exact = (r.users || []).find(
+        (u) => u.username === name || u.nickname === name,
+      );
+      const user = exact || r.users?.[0];
+      if (user) {
+        nav(userPath(user.id));
+      }
+    } catch {
+      // 未登录或失败时忽略
+    }
+  };
+
   return (
     <div
       className="floor-body"
+      onClick={(e) => {
+        const el = (e.target as HTMLElement).closest('.mention') as HTMLElement | null;
+        if (!el) return;
+        const name = el.getAttribute('data-name');
+        if (!name) return;
+        e.preventDefault();
+        void openMention(name);
+      }}
+      onKeyDown={(e) => {
+        if (e.key !== 'Enter' && e.key !== ' ') return;
+        const el = e.target as HTMLElement;
+        if (!el.classList.contains('mention')) return;
+        const name = el.getAttribute('data-name');
+        if (!name) return;
+        e.preventDefault();
+        void openMention(name);
+      }}
       dangerouslySetInnerHTML={{
-        __html: highlightMentions(content, onMentionClick),
+        __html: highlightMentions(content),
       }}
     />
   );