feat: Cierre section (07, dark) — closing quote + contact links

components/sections/__tests__/Cierre.test.tsx

@@ -0,0 +1,19 @@
+import { render, screen } from '@testing-library/react';
+import { describe, it, expect } from 'vitest';
+import { Cierre } from '../Cierre';
+
+describe('<Cierre />', () => {
+  it('renders the closing quote', () => {
+    render(<Cierre />);
+    expect(screen.getByText(/Devuélvele claridad/i)).toBeInTheDocument();
+  });
+  it('renders 3 contact links with correct hrefs', () => {
+    render(<Cierre />);
+    const wa = screen.getByRole('link', { name: /whatsapp/i });
+    const mail = screen.getByRole('link', { name: /email/i });
+    const li = screen.getByRole('link', { name: /linkedin/i });
+    expect(wa.getAttribute('href')).toMatch(/^https:\/\/wa\.me\//);
+    expect(mail.getAttribute('href')).toMatch(/^mailto:/);
+    expect(li.getAttribute('href')).toMatch(/^https:\/\/(www\.)?linkedin\./);
+  });
+});