feat: implement comprehensive Form UI library with React Hook Form integration, Zod validation, and i18n support.

packages/ui/src/__tests__/setup.ts

@@ -0,0 +1,38 @@
+import '@testing-library/jest-dom/vitest';
+
+// ---------------------------------------------------------------------------
+// Polyfill: window.matchMedia
+// ---------------------------------------------------------------------------
+// Mantine v8's MantineProvider calls window.matchMedia internally for
+// color scheme detection. jsdom does not implement matchMedia, so we
+// provide a minimal stub to prevent TypeError during test rendering.
+// ---------------------------------------------------------------------------
+
+Object.defineProperty(window, 'matchMedia', {
+  writable: true,
+  value: (query: string) => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: () => {},
+    removeListener: () => {},
+    addEventListener: () => {},
+    removeEventListener: () => {},
+    dispatchEvent: () => false,
+  }),
+});
+
+// ---------------------------------------------------------------------------
+// Polyfill: ResizeObserver
+// ---------------------------------------------------------------------------
+// Some Mantine components (Popover, Select dropdown) use ResizeObserver
+// which is also not available in jsdom.
+// ---------------------------------------------------------------------------
+
+class ResizeObserverStub {
+  observe() {}
+  unobserve() {}
+  disconnect() {}
+}
+
+window.ResizeObserver = ResizeObserverStub as unknown as typeof ResizeObserver;