评论编辑器改为紧凑底栏与精简工具栏，评论操作收进更多菜单。

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

frontend/lib/format.ts

@@ -54,3 +54,12 @@ export function formatDateTime(dateStr: string): string {
   if (Number.isNaN(d.getTime())) return "";
   return `${formatDate(dateStr)} ${pad2(d.getHours())}:${pad2(d.getMinutes())}:${pad2(d.getSeconds())}`;
 }
+
+/** 评论列表短时间：同年「M月D日 HH:mm」，跨年补年份。悬停用 formatDateTime。 */
+export function formatCommentTime(dateStr: string, now = new Date()): string {
+  const d = new Date(dateStr);
+  if (Number.isNaN(d.getTime())) return "";
+  const hm = `${pad2(d.getHours())}:${pad2(d.getMinutes())}`;
+  const md = `${d.getMonth() + 1}月${d.getDate()}日 ${hm}`;
+  return d.getFullYear() === now.getFullYear() ? md : `${d.getFullYear()}年${md}`;
+}