feat: 添加登录失败处理及记录格式化功能

增加登录失败状态处理和重试机制
将记录格式化逻辑提取到工具函数
优化云数据库查询性能

pages/records/records.js

@@ -1,5 +1,5 @@
 // records.js
-const { appointmentDB } = require('../../utils/cloud')
+const { appointmentDB, formatRecord } = require('../../utils/cloud')
 const app = getApp()
 
 Page({
@@ -11,18 +11,12 @@ Page({
   },
 
   onLoad() {
-    if (!app.globalData.isLoggedIn) {
-      wx.showToast({ title: '请先登录', icon: 'none' })
-      setTimeout(() => {
-        wx.navigateBack()
-      }, 1500)
-      return
-    }
     this.loadRecords()
   },
 
   onShow() {
-    if (app.globalData.isLoggedIn) {
+    // 仅从预约页返回时刷新，避免 onLoad + onShow 双重加载
+    if (this.data._loaded) {
       this.loadRecords()
     }
   },
@@ -32,26 +26,12 @@ Page({
     try {
       const openid = app.globalData.userInfo.openid
       const records = await appointmentDB.getList(openid)
-
-      // 格式化时间
-      const formatted = records.map(item => {
-        const date = item.createTime
-        let createTimeStr = ''
-        if (date) {
-          if (typeof date === 'object' && date.$date) {
-            createTimeStr = new Date(date.$date).toLocaleString('zh-CN')
-          } else {
-            createTimeStr = new Date(date).toLocaleString('zh-CN')
-          }
-        }
-        return { ...item, createTime: createTimeStr }
-      })
-
-      this.setData({ records: formatted, loading: false })
+      const formatted = records.map(item => formatRecord(item))
+      this.setData({ records: formatted, loading: false, _loaded: true })
       this.filterRecords()
     } catch (err) {
       console.error('加载预约记录失败', err)
-      this.setData({ records: [], loading: false })
+      this.setData({ records: [], loading: false, _loaded: true })
       this.filterRecords()
     }
   },