修正创作进度耗时计算

src/services/customWorldAgentGenerationProgress.test.ts

@@ -128,6 +128,19 @@ test('maps running draft_foundation operation to refined generation progress ste
   expect(isDraftFoundationOperationRunning(baseOperation)).toBe(true);
 });
 
+test('calculates elapsed time from operation startedAt before local fallback', () => {
+  const progress = buildAgentDraftFoundationGenerationProgress(
+    {
+      ...baseOperation,
+      startedAt: '1970-01-01T00:00:01.000Z',
+    },
+    4_000,
+    6_000,
+  );
+
+  expect(progress?.elapsedMs).toBe(5_000);
+});
+
 test('maps auto asset phases to refined generation progress steps', () => {
   const progress = buildAgentDraftFoundationGenerationProgress(
     {

src/services/customWorldAgentGenerationProgress.ts

@@ -380,6 +380,18 @@ function parseOperationUpdatedAtMs(
   return Number.isFinite(parsedMs) ? parsedMs : null;
 }
 
+function parseOperationStartedAtMs(
+  operation: CustomWorldAgentOperationRecord,
+) {
+  const rawStartedAt = operation.startedAt?.trim();
+  if (!rawStartedAt) {
+    return null;
+  }
+
+  const parsedMs = Date.parse(rawStartedAt);
+  return Number.isFinite(parsedMs) ? parsedMs : null;
+}
+
 function resolveAgentDraftFoundationStepIndex(
   operation: CustomWorldAgentOperationRecord,
 ) {
@@ -517,7 +529,7 @@ export function isDraftFoundationOperationRunning(
 
 export function buildAgentDraftFoundationGenerationProgress(
   operation: CustomWorldAgentOperationRecord | null | undefined,
-  startedAtMs: number | null,
+  fallbackStartedAtMs: number | null,
   nowMs = Date.now(),
 ): CustomWorldGenerationProgress | null {
   if (!isDraftFoundationOperation(operation)) {
@@ -526,6 +538,8 @@ export function buildAgentDraftFoundationGenerationProgress(
 
   const activeStepIndex = resolveAgentDraftFoundationStepIndex(operation);
   const overallProgress = resolveFailedProgress(operation, activeStepIndex);
+  // 中文注释：总耗时必须绑定服务端 operation 创建时间，避免刷新或前端重挂载后重新计时。
+  const startedAtMs = parseOperationStartedAtMs(operation) ?? fallbackStartedAtMs;
   const elapsedMs = startedAtMs ? Math.max(0, nowMs - startedAtMs) : 0;
   const estimatedRemainingMs = resolveEstimatedRemainingMs(
     overallProgress,