feat: Cómo empezar section (07) — 3-step on-ramp to WhatsApp

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

components/sections/__tests__/ComoEmpezar.test.tsx

@@ -0,0 +1,18 @@
+import { render, screen } from '@testing-library/react';
+import { describe, it, expect } from 'vitest';
+import { ComoEmpezar } from '../ComoEmpezar';
+
+describe('<ComoEmpezar />', () => {
+  it('renders the on-ramp steps', () => {
+    render(<ComoEmpezar />);
+    expect(screen.getByText('Escríbeme')).toBeInTheDocument();
+    expect(screen.getByText('Sesión de diagnóstico')).toBeInTheDocument();
+  });
+  it('links the CTA to WhatsApp with a prefilled message', () => {
+    render(<ComoEmpezar />);
+    const cta = screen.getByRole('link', { name: /Agenda tu sesión de diagnóstico/i });
+    const href = cta.getAttribute('href') ?? '';
+    expect(href).toMatch(/^https:\/\/wa\.me\//);
+    expect(href).toContain('text=');
+  });
+});