Add JS interactivity: SPA navigation, data structures, and dynamic content generation

[Copilot]

Converts a static multi-section HTML page into a JavaScript-driven SPA where all content is generated dynamically and navigation switches sections without reload.

Architecture

• index.html reduced to a bare shell — only three hook elements (#nav-principal, #contenido-principal, #pie-pagina); zero repeated markup
• main.js generates the entire UI at runtime using required data structures and control flow:

Structure	Usage
Array	navItems, servicios, form-field configs (camposNombre, camposDireccion, telefonos)
Map	planesMap (plan → details), seccionesGeneradoras (section id → generator fn)
Set	tecnologias (auto-deduplicates entries), seccionesVisitadas (visited tracking)
switch	Routes mostrarSeccion() calls with per-section console logging
if	Form validation (empty name / email)
for (index)	Builds services <ul>
for…of	Iterates Set (tech tags), Map (plans table rows), arrays (nav links, form fields)
while	Generates province <option> elements

• style.css added from scratch — dark sticky nav with active-link indicator, fade-in section transition, responsive layout

Key pattern

Navigation uses a Map<string, () => HTMLElement> to dispatch section generators, keeping each section's DOM construction isolated and the routing logic trivial:

const seccionesGeneradoras = new Map([
  ['inicio',   generarInicio],
  ['tabla',    generarTabla],
  ['galeria',  generarGaleria],
  ['contacto', generarContacto]
]);

function mostrarSeccion(id) {
  seccionesVisitadas.add(id);          // Set
  switch (id) { /* log + guard */ }
  contenido.innerHTML = '';
  contenido.appendChild(seccionesGeneradoras.get(id)());
  actualizarNavActiva(id);
}

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