import "../index.css"; import { describe, expect, it } from "vite-plus/test";import { render } from "vitest-browser-react"; import { DiffPanelShell } from "./DiffPanelShell"; describe("DiffPanelShell", () => {  it("uses the shared compact surface subheader in embedded mode", async () => {    const screen = await render(      <DiffPanelShell mode="embedded" header={<span>Diff controls</span>}>        <div>Diff content</div>      </DiffPanelShell>,    );    const subheader = screen.container.querySelector<HTMLElement>("[data-surface-subheader]");     expect(subheader).not.toBeNull();    expect(subheader?.getBoundingClientRect().height).toBe(40);    expect(window.getComputedStyle(subheader!).borderTopWidth).toBe("0px");    expect(window.getComputedStyle(subheader!).borderBottomWidth).toBe("1px");  });});