[NIVEL 2 AVANCE] Issues #49-#53 - Componentes Principales Verificados

Todos los componentes del NIVEL 2 ya están implementados correctamente:
- ✅ Notification Bar (#49)
- ✅ Navbar (#50)
- ✅ Hero Section (#51)
- ✅ Sidebar (#52)
- ✅ Footer (#53)

Solo se actualizó notification-bar.css para usar variables CSS.

Próximo paso: NIVEL 3 (Refinamientos visuales)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

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