fix: 审查修复 - 失败时允许总览刷新 + sync error 清结果 + 回填保护

Author: Astro-Han

quantclass_sync_internal/gui/assets/app.js

@@ -129,7 +129,8 @@ document.addEventListener('alpine:init', () => {
         // 切换到总览时自动刷新数据（同步进行中不刷新，避免干扰）
         switchTab(name) {
             this.tab = name;
-            if (name === 'overview' && this.syncStatus !== 'syncing' && !this.checkUpdateResult) {
+            if (name === 'overview' && this.syncStatus !== 'syncing'
+                && !(this.checkUpdateResult && !this.checkUpdateResult.isError)) {
                 this.loadOverview();
             }
             if (name === 'history' && !this.historyLoaded && !this.historyLoading) {
@@ -190,6 +191,7 @@ document.addEventListener('alpine:init', () => {
                         this.errorMessage = p.error_message || '同步失败';
                         this.runSummary = p.run_summary;  // 部分失败时也携带摘要
                         this.historyLoaded = false; // 有新运行，下次切历史页时刷新
+                        this.checkUpdateResult = null; // 同步后清除检查更新结果
                         this.pollTimer = null;
                         return; // 终态，不再调度下次轮询
                     }

quantclass_sync_internal/status_store.py

@@ -489,12 +489,15 @@ def update_api_latest_dates(log_dir: Path, api_latest_dates: Dict[str, str]) ->
 
     with open(lock_path, "w") as lock_fd:
         _flock_exclusive(lock_fd)
+        # 文件缺失或损坏时先从历史报告回填，避免覆盖丢失已有状态
         existing: Dict[str, Dict[str, str]] = {}
         if status_path.exists():
             try:
                 existing = json.loads(status_path.read_text(encoding="utf-8"))
             except (OSError, json.JSONDecodeError):
-                pass
+                existing = _scan_reports_for_backfill(log_dir)
+        else:
+            existing = _scan_reports_for_backfill(log_dir)
         for product, date_str in api_latest_dates.items():
             if product in existing:
                 existing[product]["date_time"] = date_str