fix(mini-user): 去掉 Intl，兼容微信小程序无 Intl 环境

门店详情走马灯与核销成功时间改为纯 Date 计算东八区格式。

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

apps/mini-user/src/pages/store-detail/index.tsx

@@ -15,6 +15,7 @@ import ShareNavButton from '../../components/ShareNavButton';
 import StoreRedeemMarquee from '../../components/StoreRedeemMarquee';
 import WechatShareReady from '../../components/WechatShareReady';
 import { request, toast } from '../../lib/api';
+import { formatShanghaiDateTime } from '../../lib/datetime';
 import {
   DEFAULT_SHARE_DESC,
   DEFAULT_SHARE_TITLE,
@@ -91,26 +92,7 @@ function pickStoreId(raw?: string | null) {
 
 /** 与历史记录一致：2026-08-03 15:14:30（Asia/Shanghai） */
 function formatRedeemTime(input?: string | null) {
-  const d = input ? new Date(input) : new Date();
-  if (Number.isNaN(d.getTime())) {
-    // 后端若已是 "2026-08-03 15:14:30" 直接展示
-    const s = String(input || '').trim();
-    if (/^\d{4}-\d{2}-\d{2}/.test(s)) return s.slice(0, 19).replace('T', ' ');
-    return '—';
-  }
-  const parts = new Intl.DateTimeFormat('en-CA', {
-    timeZone: 'Asia/Shanghai',
-    year: 'numeric',
-    month: '2-digit',
-    day: '2-digit',
-    hour: '2-digit',
-    minute: '2-digit',
-    second: '2-digit',
-    hour12: false,
-  }).formatToParts(d);
-  const get = (type: Intl.DateTimeFormatPartTypes) =>
-    parts.find((p) => p.type === type)?.value ?? '';
-  return `${get('year')}-${get('month')}-${get('day')} ${get('hour')}:${get('minute')}:${get('second')}`;
+  return formatShanghaiDateTime(input);
 }
 
 function formatRedeemAmountYuan(amount: number | string) {