fix: 修复桌面 DOCX 媒体捕获超时

apps/desktop/tests/docx-contract.test.ts

@@ -41,6 +41,40 @@ describe("Desktop DOCX IPC 契约", () => {
     });
   });
 
+  it("仅透传格式受控的桌面媒体超时详情", () => {
+    expect(
+      toDesktopDocxExportFailure(
+        new DocxExportServiceError(
+          500,
+          "DOCX_GENERATION_FAILED",
+          "DOCX 导出失败",
+          false,
+          { cause: new Error("桌面 DOCX 媒体布局超过 30000ms") }
+        )
+      )
+    ).toMatchObject({
+      message: "DOCX 导出失败：桌面 DOCX 媒体布局超过 30000ms"
+    });
+    expect(
+      toDesktopDocxExportFailure(
+        new DocxExportServiceError(
+          500,
+          "DOCX_GENERATION_FAILED",
+          "DOCX 导出失败",
+          false,
+          {
+            cause: new Error(
+              "桌面 DOCX 第 2/7 个媒体（echarts）PNG 捕获超过 20000ms"
+            )
+          }
+        )
+      )
+    ).toMatchObject({
+      message:
+        "DOCX 导出失败：桌面 DOCX 第 2/7 个媒体（echarts）PNG 捕获超过 20000ms"
+    });
+  });
+
   it("保留 Front Matter 解析错误", () => {
     expect(
       toDesktopDocxExportFailure(

apps/desktop/tests/electron-docx-media-capture.test.ts

@@ -104,4 +104,52 @@ describe("Electron DOCX 媒体捕获", () => {
     );
     expect(detach).toHaveBeenCalledOnce();
   });
+
+  it("媒体布局永久不返回时报告局部超时", async () => {
+    const webContents = {
+      executeJavaScript: vi.fn(() => new Promise(() => undefined)),
+      debugger: {
+        isAttached: vi.fn(() => false)
+      }
+    } as unknown as WebContents;
+
+    await expect(
+      captureDocxMediaWithElectronWebContents(
+        webContents,
+        request,
+        undefined,
+        { renderMs: 10, screenshotMs: 10 }
+      )
+    ).rejects.toThrow("桌面 DOCX 媒体布局超过 10ms");
+  });
+
+  it("单个 PNG 永久不返回时报告媒体编号和类型", async () => {
+    let attached = false;
+    const detach = vi.fn(() => {
+      attached = false;
+    });
+    const webContents = {
+      executeJavaScript: vi.fn(async () => plan),
+      debugger: {
+        isAttached: vi.fn(() => attached),
+        attach: vi.fn(() => {
+          attached = true;
+        }),
+        detach,
+        sendCommand: vi.fn(() => new Promise(() => undefined))
+      }
+    } as unknown as WebContents;
+
+    await expect(
+      captureDocxMediaWithElectronWebContents(
+        webContents,
+        request,
+        undefined,
+        { renderMs: 10, screenshotMs: 10 }
+      )
+    ).rejects.toThrow(
+      "桌面 DOCX 第 1/1 个媒体（image）PNG 捕获超过 10ms"
+    );
+    expect(detach).toHaveBeenCalledOnce();
+  });
 });

apps/desktop/tests/electron-docx-media-engine.test.ts

@@ -0,0 +1,47 @@
+import { describe, expect, it, vi } from "vitest";
+import { withActiveDocxCaptureSurface } from "../src/electron-docx-media-engine.js";
+
+function createWindow() {
+  let destroyed = false;
+  return {
+    showInactive: vi.fn(),
+    hide: vi.fn(),
+    isDestroyed: vi.fn(() => destroyed),
+    destroy: () => {
+      destroyed = true;
+    }
+  };
+}
+
+describe("Electron DOCX 捕获合成表面", () => {
+  it("截图期间无焦点显示窗口并在完成后隐藏", async () => {
+    const window = createWindow();
+    const operation = vi.fn(async () => "captured");
+
+    await expect(
+      withActiveDocxCaptureSurface(window, operation, 0)
+    ).resolves.toBe("captured");
+
+    expect(window.showInactive).toHaveBeenCalledOnce();
+    expect(operation).toHaveBeenCalledOnce();
+    expect(window.hide).toHaveBeenCalledOnce();
+  });
+
+  it("窗口在失败期间销毁时不再隐藏", async () => {
+    const window = createWindow();
+
+    await expect(
+      withActiveDocxCaptureSurface(
+        window,
+        async () => {
+          window.destroy();
+          throw new Error("capture failed");
+        },
+        0
+      )
+    ).rejects.toThrow("capture failed");
+
+    expect(window.showInactive).toHaveBeenCalledOnce();
+    expect(window.hide).not.toHaveBeenCalled();
+  });
+});