feat(renderer): add shadcn checkbox primitive

tests/component/ui/checkbox.test.tsx

@@ -0,0 +1,13 @@
+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { Checkbox } from '@/components/ui/checkbox';
+
+describe('Checkbox', () => {
+  it('toggles checked state on click', async () => {
+    const onCheckedChange = vi.fn();
+    render(<Checkbox aria-label="agree" onCheckedChange={onCheckedChange} />);
+    await userEvent.click(screen.getByRole('checkbox', { name: /agree/i }));
+    expect(onCheckedChange).toHaveBeenCalledWith(true);
+  });
+});