修复了一点bug，然后增加了图层拆分更多的功能

tests/seedream-layer-edit-result-sync.test.ts

@@ -0,0 +1,94 @@
+import { readFile } from "node:fs/promises";
+import { afterEach, describe, expect, it, vi } from "vitest";
+
+import { waitForJobOutputAssets } from "../lib/client/generation-result-sync";
+import type { Asset, GenerationJob } from "../lib/types";
+
+const resultAsset: Asset = {
+  id: "asset-result",
+  ownerId: "owner-1",
+  kind: "image",
+  name: "编辑结果.png",
+  url: "/generated-results/asset-result.png",
+  source: "generated",
+  tags: [],
+  metadata: {},
+  createdAt: "2026-09-02T00:00:00.000Z",
+  updatedAt: "2026-09-02T00:00:00.000Z"
+};
+
+const succeededBeforeOutputSync: GenerationJob = {
+  id: "job-edit-1",
+  ownerId: "owner-1",
+  capability: "image.generate",
+  provider: "seedream",
+  reqKey: "doubao-seedream-5-0-pro-260628",
+  status: "succeeded",
+  inputAssetIds: ["asset-source"],
+  inputUrls: [],
+  outputAssetIds: [],
+  requestPayload: {},
+  createdAt: "2026-09-02T00:00:00.000Z",
+  updatedAt: "2026-09-02T00:00:00.000Z"
+};
+
+describe("Seedream layer edit result synchronization", () => {
+  afterEach(() => {
+    vi.useRealTimers();
+    vi.unstubAllGlobals();
+  });
+
+  it("refreshes a succeeded job whose output IDs arrive after the terminal status", async () => {
+    vi.useFakeTimers();
+    vi.stubGlobal("window", { setTimeout, clearTimeout });
+    const fetchMock = vi.fn(async (input: RequestInfo | URL) => {
+      const url = String(input);
+      if (url === "/api/generations/image/job-edit-1") {
+        return Response.json({ job: { ...succeededBeforeOutputSync, outputAssetIds: [resultAsset.id] } });
+      }
+      if (url === "/api/assets/asset-result") return Response.json({ asset: resultAsset });
+      return Response.json({ error: "unexpected request" }, { status: 404 });
+    });
+    vi.stubGlobal("fetch", fetchMock);
+
+    const pending = waitForJobOutputAssets(succeededBeforeOutputSync, new AbortController().signal);
+    await vi.runAllTimersAsync();
+
+    await expect(pending).resolves.toEqual([resultAsset]);
+    expect(fetchMock).toHaveBeenCalledWith("/api/generations/image/job-edit-1", expect.objectContaining({ cache: "no-store" }));
+    expect(fetchMock).toHaveBeenCalledWith("/api/assets/asset-result", expect.objectContaining({ cache: "no-store" }));
+  });
+
+  it("retries the direct asset lookup while the registered result is not readable yet", async () => {
+    vi.useFakeTimers();
+    vi.stubGlobal("window", { setTimeout, clearTimeout });
+    let assetReads = 0;
+    const job = { ...succeededBeforeOutputSync, outputAssetIds: [resultAsset.id] };
+    const fetchMock = vi.fn(async (input: RequestInfo | URL) => {
+      const url = String(input);
+      if (url === "/api/generations/image/job-edit-1") return Response.json({ job });
+      if (url === "/api/assets/asset-result") {
+        assetReads += 1;
+        return assetReads === 1
+          ? Response.json({ error: "资产不存在" }, { status: 404 })
+          : Response.json({ asset: resultAsset });
+      }
+      return Response.json({ error: "unexpected request" }, { status: 404 });
+    });
+    vi.stubGlobal("fetch", fetchMock);
+
+    const pending = waitForJobOutputAssets(job, new AbortController().signal);
+    await vi.runAllTimersAsync();
+
+    await expect(pending).resolves.toEqual([resultAsset]);
+    expect(assetReads).toBe(2);
+  });
+
+  it("offers result-only retry instead of submitting and billing another edit task", async () => {
+    const viewer = await readFile(new URL("../components/seedream-layer-result-viewer.tsx", import.meta.url), "utf8");
+
+    expect(viewer).toContain("retryLayerEditResultSync");
+    expect(viewer).toContain("重新同步结果");
+    expect(viewer).toContain("不会再次提交任务或计费");
+  });
+});