feat: 完善表情选择与评论富文本展示

发帖编辑器支持 OwO 贴纸；评论区复用文章列表、段落与代码块阅读态，并优化表情面板间距与悬停反馈。

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

frontend/src/data/stickers/hot.ts

@@ -15,10 +15,7 @@ export async function loadHotStickers(): Promise<Sticker[]> {
   const allEmoji = getAllStickers();
   const all = [...allEmoji, ...KAOMOJI_STICKERS];
   return all
-    .filter((s) => {
-      if (s.category === '颜文字') return true;
-      return s.aliases?.some((a) => HOT_KEYWORDS.includes(a)) || HOT_KEYWORDS.includes(s.name);
-    })
+    .filter((s) => s.aliases?.some((a) => HOT_KEYWORDS.includes(a)) || HOT_KEYWORDS.includes(s.name))
     .slice(0, 30)
     .map((s) => ({ ...s, category: '热门' as const }));
 }