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/cloud.js

@@ -24,8 +24,10 @@ const init = () => {
   try {
     wx.cloud.init({ env: ENV_ID, traceUser: true })
     _enabled = true
+    console.log('[cloud] init ok, env:', ENV_ID)
   } catch (e) {
     _enabled = false
+    console.warn('[cloud] init failed — cloud sync disabled:', e.message || e)
   }
 }
 
@@ -40,10 +42,13 @@ const pullAll = async () => {
     }
     if (!_openid) return null  // cloud function call failed; bail
 
-    // Locate our doc by _openid, not by limit(1) which can pick someone
-    // else's doc when the custom rule is in effect.
+    // Locate our doc by _openid, ordered by updatedAt descending so
+    // we always get the MOST RECENT doc. Without orderBy, limit(1)
+    // returns the OLDEST doc (_id ascending), which causes data loss
+    // when duplicate docs exist from the old cold-start-add() bug.
     const mine = await db.collection(DB_COLLECTION)
       .where({ _openid: _openid })
+      .orderBy('updatedAt', 'desc')
       .limit(1)
       .get()
     if (mine && mine.data && mine.data.length > 0) {
@@ -67,7 +72,10 @@ const _fetchOpenid = async () => {
   try {
     const res = await wx.cloud.callFunction({ name: 'getOpenid' })
     if (res && res.result && res.result.openid) return res.result.openid
-  } catch (e) { /* function not deployed, etc. */ }
+    console.warn('[cloud] getOpenid returned no openid:', JSON.stringify(res))
+  } catch (e) {
+    console.warn('[cloud] getOpenid call failed — cloud functions may not be deployed:', e.message || e)
+  }
   return null
 }
 
@@ -111,6 +119,17 @@ const pushAll = () => {
   })
 }
 
+const cancelPendingPush = () => {
+  if (_pushTimer) {
+    clearTimeout(_pushTimer)
+    _pushTimer = null
+  }
+}
+
+const _markSynced = () => {
+  try { wx.setStorageSync('_cloud_sync_at', Date.now()) } catch (e) {}
+}
+
 const _doPush = async () => {
   console.log('[cloud] _doPush starting...')
   const db = getDb()
@@ -135,6 +154,7 @@ const _doPush = async () => {
       try {
         await db.collection(DB_COLLECTION).doc(_docId).update({ data })
         console.log('[cloud] _doPush update ok')
+        _markSynced()
         return
       } catch (e) {
         // Most commonly: doc was deleted out from under us (user cleared
@@ -163,6 +183,7 @@ const _doPush = async () => {
         try {
           await db.collection(DB_COLLECTION).doc(_docId).update({ data })
           console.log('[cloud] _doPush update ok (re-located by _openid)')
+          _markSynced()
           return
         } catch (e) {
           // If even the freshly-located doc rejects our update (custom
@@ -185,6 +206,7 @@ const _doPush = async () => {
     if (res && res._id) _docId = res._id
     if (res && res._openid) _openid = res._openid
     console.log('[cloud] _doPush add ok, docId=', _docId)
+    _markSynced()
   } catch (e) {
     console.log('[cloud] _doPush error:', e.message || e)
   }
@@ -227,4 +249,12 @@ const clearAll = async () => {
   _docId = null
 }
 
-module.exports = { init, pullAll, pushAll, clearAll, get enabled() { return _enabled } }
+module.exports = {
+  init, pullAll, pushAll, clearAll, cancelPendingPush,
+  get enabled() { return _enabled },
+  get syncStatus() {
+    if (!_enabled) return 'disabled'
+    if (!_openid) return 'unauthenticated'
+    return 'ok'
+  }
+}