feat: Mecanismo section (04, dark) — 3-step method

components/sections/__tests__/Mecanismo.test.tsx

@@ -0,0 +1,16 @@
+import { render, screen } from '@testing-library/react';
+import { describe, it, expect } from 'vitest';
+import { Mecanismo } from '../Mecanismo';
+
+describe('<Mecanismo />', () => {
+  it('renders the 3 steps in order', () => {
+    render(<Mecanismo />);
+    expect(screen.getByText('Inmersión')).toBeInTheDocument();
+    expect(screen.getByText('Desafiar supuestos')).toBeInTheDocument();
+    expect(screen.getByText('Estrategia ejecutable')).toBeInTheDocument();
+  });
+  it('renders step numbers 01/02/03', () => {
+    const { container } = render(<Mecanismo />);
+    expect(container.textContent).toMatch(/01.+02.+03/);
+  });
+});