fix: 13项数据存储与排行榜修复

致命修复:
- leaderboard: 日榜日期比较改用 dateOnly() 替代严格全等
- plan: 计划天数计算日期比较改用 dateOnly()
- cloud: pullAll 添加 orderBy('updatedAt','desc') 确保取最新文档避免数据丢失

严重修复:
- cloud: 新增 cancelPendingPush() 防止清除数据后被延迟推送复活
- settings: _doClearData 补充 user_profile 清除, 先取消推送再清除
- app: 云端同步改为时间戳比对策略, 支持跨设备拉取
- app: _restoreFromCloud 增加空数据保护和 profile 恢复
- storage: 记录ID改用时间戳+自增计数器确保唯一性

中等修复:
- cloud: init/_fetchOpenid 日志升级, 新增 syncStatus getter
- leaderboard云函数: 添加90天活跃过滤减少全表扫描
- storage: validateStreak 增加lastDate无记录时的通用修复
- leaderboard页面: 云函数失败时Toast提示用户而非静默降级

轻微修复:
- timer: onUnload 添加 voice.destroy() 释放音频上下文
- records: onLongPressDelete 委托给 onDeleteRecord 消除重复代码

Co-Authored-By: Claude <noreply@anthropic.com>

utils/plan.js

@@ -1,4 +1,4 @@
-const { formatDate } = require('./util')
+const { formatDate, dateOnly } = require('./util')
 
 /**
  * Build the per-day target array for a plan from its formula fields.
@@ -90,7 +90,7 @@ const getPlanDay = (planId, records, planStartDate) => {
   // Filter records: same plan, after plan start date, and not today
   const eligibleRecords = records.filter(r => {
     if (r.planId !== planId) return false
-    if (r.date === today) return false
+    if (dateOnly(r.date) === dateOnly(today)) return false
     if (planStartDate && r.date < planStartDate) return false
     return true
   })