Harden async task flows and enhance analysis tooling

client/src/pages/Logs.tsx

@@ -37,11 +37,30 @@ function formatStructuredValue(value: unknown) {
   }
 }
 
+function formatTaskTiming(task: {
+  createdAt: string | Date;
+  startedAt?: string | Date | null;
+  completedAt?: string | Date | null;
+}) {
+  const createdAt = new Date(task.createdAt).getTime();
+  const startedAt = task.startedAt ? new Date(task.startedAt).getTime() : null;
+  const completedAt = task.completedAt ? new Date(task.completedAt).getTime() : null;
+  const durationMs = (completedAt ?? Date.now()) - (startedAt ?? createdAt);
+  const seconds = Math.max(0, Math.round(durationMs / 1000));
+  if (seconds < 60) return `${seconds}s`;
+  const minutes = Math.floor(seconds / 60);
+  const rest = seconds % 60;
+  return `${minutes}m ${rest.toString().padStart(2, "0")}s`;
+}
+
 export default function Logs() {
   const utils = trpc.useUtils();
   const taskListQuery = trpc.task.list.useQuery(
     { limit: 50 },
     {
+      retry: 3,
+      retryDelay: (attempt) => Math.min(1_000 * 2 ** attempt, 8_000),
+      placeholderData: (previous) => previous,
       refetchInterval: (query) => {
         const hasActiveTask = (query.state.data ?? []).some((task) => task.status === "queued" || task.status === "running");
         return hasActiveTask ? 3_000 : 10_000;
@@ -103,6 +122,16 @@ export default function Logs() {
         </AlertDescription>
       </Alert>
 
+      {taskListQuery.isError ? (
+        <Alert variant="destructive">
+          <AlertTriangle className="h-4 w-4" />
+          <AlertTitle>任务列表刷新失败</AlertTitle>
+          <AlertDescription>
+            当前显示最近一次成功拉取的数据。服务恢复后页面会自动继续刷新。
+          </AlertDescription>
+        </Alert>
+      ) : null}
+
       <Tabs defaultValue="tasks" className="space-y-4">
         <TabsList>
           <TabsTrigger value="tasks">后台任务</TabsTrigger>
@@ -153,7 +182,9 @@ export default function Logs() {
                       ) : null}
 
                       <div className="flex items-center justify-between text-xs text-muted-foreground">
-                        <span>进度 {task.progress}% · 尝试 {task.attempts}/{task.maxAttempts}</span>
+                        <span>
+                          进度 {task.progress}% · 尝试 {task.attempts}/{task.maxAttempts} · 耗时 {formatTaskTiming(task)}
+                        </span>
                         {task.status === "failed" ? (
                           <Button
                             variant="outline"