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/storage.js

@@ -7,6 +7,8 @@ const STREAK_KEY = 'current_streak'
 const CUSTOM_PLANS_KEY = 'custom_plans'
 const PROFILE_KEY = 'user_profile'
 
+let _idSeq = 0
+
 /**
  * Backfill an `id` for any record that doesn't have one.
  * Older records (e.g. data restored from cloud or migrated from a build
@@ -46,7 +48,7 @@ const getRecords = () => {
 }
 
 const saveRecord = (record) => {
-  record.id = String(Date.now())
+  record.id = String(Date.now()) + '_' + (++_idSeq)
   const records = getRecords()
   const month = record.date.substring(0, 7)
   if (!records[month]) records[month] = []
@@ -190,8 +192,10 @@ const validateStreak = () => {
     monthRecs.forEach(r => allDates.add(dateOnly(r.date)))
   })
 
+  const lastOnly = dateOnly(streak.lastDate)
+
   // If lastDate is today, check today still has records
-  if (dateOnly(streak.lastDate) === todayOnly) {
+  if (lastOnly === todayOnly) {
     if (!allDates.has(todayOnly)) {
       // Today's records were deleted
       if (allDates.has(yesterdayOnly)) {
@@ -206,8 +210,33 @@ const validateStreak = () => {
     return streak
   }
 
-  // If lastDate is not today and not yesterday, streak is already broken
-  // (updateStreak handles reset on next training), no action needed here
+  // If lastDate points to a date that no longer has ANY records,
+  // recompute the streak from actual recorded dates.
+  if (!allDates.has(lastOnly)) {
+    const sorted = Array.from(allDates).sort().reverse()
+    if (sorted.length === 0) {
+      streak.count = 0
+      streak.lastDate = ''
+    } else {
+      let count = 1
+      let prev = sorted[0]
+      for (let i = 1; i < sorted.length; i++) {
+        const prevDate = new Date(prev.replace(/-/g, '/'))
+        const curDate = new Date(sorted[i].replace(/-/g, '/'))
+        const diff = Math.round((prevDate - curDate) / (1000 * 60 * 60 * 24))
+        if (diff === 1) {
+          count++
+          prev = sorted[i]
+        } else {
+          break
+        }
+      }
+      streak.count = count
+      streak.lastDate = sorted[0]
+    }
+    wx.setStorageSync(STREAK_KEY, streak)
+  }
+
   return streak
 }