// Dynamic menu loader — injects children into named groups in the side-nav.
// Imported non-blocking from index.html — does not delay routing.
//
// Example: populate a group declared in config.yml.
//
//   const nav = document.querySelector('side-nav')
//   await nav.ready
//   nav.setGroupChildren('Mon Groupe', [
//     { label: 'Item A', href: '#/item-a', icon: 'folder' },
//   ])