audit fixes: align all frontend timestamps to Beijing time + debounce MarketPage search (vv2026.07.20.1)

frontend/src/pages/admin/Achievement.tsx

@@ -1121,7 +1121,7 @@ const Achievement: React.FC = () => {
 
                     <td style={{ color: 'rgba(0,0,0,0.4)' }}>
 
-                      {entry.last_completed ? new Date(entry.last_completed).toLocaleDateString('zh-CN') : '-'}
+                      {entry.last_completed ? formatBjDate(entry.last_completed) : '-'}
 
                     </td>
 

frontend/src/pages/admin/Ads.tsx

@@ -1,6 +1,7 @@
 import React, { useState, useEffect } from 'react';
 import { adminAPI, marketAPI } from '@/api';
 import type { AdBanner, MarketApp } from '@/types';
+import { formatBjDate } from '@/utils/datetime';
 import './Ads.css';
 
 const SVGIcon: React.FC<{ children: React.ReactNode; size?: number }> = ({ children, size = 16 }) => (
@@ -281,7 +282,7 @@ const Ads: React.FC = () => {
                       </span>
                     </td>
                     <td style={{ fontSize: 'var(--text-xs)', color: 'var(--color-text-tertiary)' }}>
-                      {new Date(banner.createdAt).toLocaleDateString()}
+                      {formatBjDate(banner.createdAt)}
                     </td>
                     <td>
                       <div style={{ display: 'flex', gap: 'var(--space-xs)' }}>

frontend/src/pages/admin/Apps.tsx

@@ -1,7 +1,7 @@
 import { useState, useEffect, useCallback } from 'react';
 import { adminAPI } from '@/api';
 import './Apps.css';
-import { formatBjTime } from '@/utils/datetime';
+import { formatBjTime, formatBjDate } from '@/utils/datetime';
 
 interface AIApp {
   id: string;
@@ -224,11 +224,7 @@ export default function AdminApps() {
   };
 
   const formatDate = (dt: string | null) => {
-    if (!dt) return '-';
-    try {
-      const d = new Date(dt);
-      return d.toLocaleDateString('zh-CN') + ' ' + d.toLocaleTimeString('zh-CN', { hour: '2-digit', minute: '2-digit' });
-    } catch { return dt; }
+    return formatBjTime(dt);
   };
 
   return (
@@ -738,7 +734,7 @@ function AppDetailDrawer({ app, analytics, onClose, onAction }: {
                   <div key={v.id} className="version-item">
                     <span className="version-num">v{v.version}</span>
                     <span className="version-log">{v.changelog}</span>
-                    <span className="version-date">{v.created_at ? new Date(v.created_at).toLocaleDateString('zh-CN') : '-'}</span>
+                    <span className="version-date">{v.created_at ? formatBjDate(v.created_at) : '-'}</span>
                   </div>
                 ))}
               </div>