test(frontend): component testing infra (jsdom + testing-library + vitest projects)

frontend/test/setup.ts

@@ -0,0 +1,21 @@
+import "@testing-library/jest-dom/vitest";
+import { cleanup } from "@testing-library/react";
+import { afterEach } from "vitest";
+
+afterEach(() => cleanup());
+
+// jsdom 缺口 polyfill（spec S2）：radix 原语在 jsdom 下的已知缺失，一次配好全体组件测试共用。
+
+class ResizeObserverStub {
+  observe() {}
+  unobserve() {}
+  disconnect() {}
+}
+globalThis.ResizeObserver ??= ResizeObserverStub as unknown as typeof ResizeObserver;
+
+Element.prototype.scrollIntoView ??= function scrollIntoView() {};
+
+// radix 的焦点/拖拽逻辑会探测 pointer capture API，jsdom 未实现
+Element.prototype.hasPointerCapture ??= (() => false) as never;
+Element.prototype.setPointerCapture ??= (() => {}) as never;
+Element.prototype.releasePointerCapture ??= (() => {}) as never;