feat: sticky Header with persistent contact CTA

components/layout/__tests__/Header.test.tsx

@@ -0,0 +1,15 @@
+import { render, screen } from '@testing-library/react';
+import { describe, it, expect } from 'vitest';
+import { Header } from '../Header';
+
+describe('<Header />', () => {
+  it('renders the wordmark', () => {
+    const { container } = render(<Header />);
+    expect(container.textContent).toContain('creeer');
+  });
+  it('renders a persistent CTA linking to the contact section', () => {
+    render(<Header />);
+    const cta = screen.getByRole('link', { name: /Hablemos/i });
+    expect(cta).toHaveAttribute('href', '#contacto');
+  });
+});