fix: 缓存击穿/play竞态/onUnload泄漏/清除数据UI/统计NaN

- leaderboard 云函数: _fetchLatestByOpenid 加 in-flight promise,并发请求复用同一次扫描,防缓存击穿
- voice: play 加序列号,丢弃过期播放,避免旧语音截断新语音
- timer: onUnload 补取消 _completionCountUp,系统返回手势不再泄漏动画定时器
- settings: 清除数据 setData 补 voiceGender/vibrateIntensity 重置,避免 UI 与存储不一致
- storage: getTotalStats 对 r.duration 防御(Number||0),避免脏数据产生 NaN 传染

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

cloudfunctions/leaderboard/index.js

@@ -22,6 +22,7 @@ const TZ_OFFSET_MS = 8 * 60 * 60 * 1000
 // across instances, which is fine - the board needn't be real-time.
 const CACHE_TTL = 60 * 1000
 let _docsCache = null  // { latestByOpenid: Map, ts }
+let _docsCachePromise = null  // in-flight 扫描 promise,防缓存击穿
 
 const tsOf = (d) => {
   if (!d.updatedAt) return 0
@@ -40,6 +41,9 @@ const _fetchLatestByOpenid = async () => {
   if (_docsCache && (Date.now() - _docsCache.ts) < CACHE_TTL) {
     return _docsCache.latestByOpenid
   }
+  // 缓存过期:复用 in-flight promise,避免并发请求各自全表扫描(缓存击穿)
+  if (_docsCachePromise) return _docsCachePromise
+  _docsCachePromise = (async () => {
   const latestByOpenid = new Map()
   // Exclude accounts that haven't synced in 90+ days to bound the scan.
   // Docs without an updatedAt field (pre-fix legacy) are included as well.
@@ -66,6 +70,8 @@ const _fetchLatestByOpenid = async () => {
   }
   _docsCache = { latestByOpenid, ts: Date.now() }
   return latestByOpenid
+  })()
+  try { return await _docsCachePromise } finally { _docsCachePromise = null }
 }
 
 exports.main = async (event) => {

pages/settings/settings.js

@@ -371,6 +371,8 @@ Page({
       currentPlanId: 'beginner',
       voiceGuide: true,
       vibrate: true,
+      voiceGender: 'female',
+      vibrateIntensity: 'heavy',
       currentThemeId: 'orange',
       nickName: '',
       avatarUrl: ''

pages/timer/timer.js

@@ -292,6 +292,10 @@ Page({
       this._countUpTask.cancel()
       this._countUpTask = null
     }
+    if (this._completionCountUp) {
+      this._completionCountUp.cancel()
+      this._completionCountUp = null
+    }
   },
 
   onStart() {

utils/storage.js

@@ -156,9 +156,10 @@ const getTotalStats = () => {
   let maxDuration = 0
   Object.keys(records).forEach((key) => {
     records[key].forEach((r) => {
-      totalDuration += r.duration
+      const d = Number(r && r.duration) || 0
+      totalDuration += d
       totalSessions++
-      if (r.duration > maxDuration) maxDuration = r.duration
+      if (d > maxDuration) maxDuration = d
     })
   })
   return { totalDuration, totalSessions, maxDuration }

utils/voice.js

@@ -32,6 +32,7 @@ const FILEID_CACHE_KEY = 'tts_fileid_cache'
 const LOCAL_CACHE_KEY = 'tts_local_cache'   // { cacheKey: savedFilePath } - 持久本地文件,跨重启
 
 let _ctx = null
+let _playSeq = 0       // play 序列号,丢弃过期播放避免乱序
 let _localCache = null      // { cacheKey: savedFilePath } - persisted, lazy-loaded
 const _urlCache = {}        // { promptKey: audioUrl } — per-session, volatile
 let _fileIDCache = null     // { promptKey: fileID } — persisted, lazy-loaded
@@ -204,8 +205,11 @@ const preload = (keys) => {
  */
 const play = async (promptKey) => {
   if (!PROMPTS[promptKey]) return
+  const seq = ++_playSeq
   const src = await _resolveSrc(promptKey)
   if (!src) return
+  // 期间若有新的 play 调用,放弃本次,避免旧语音截断新语音
+  if (seq !== _playSeq) return
   const ctx = _getCtx()
   try {
     ctx.stop()