[ui] Add semantic primitive ownership Build a layered Zenbu token and sizing system, make authored controls use native-underneath primitives, migrate mrjunejune without imposing visual surfaces, and document/enforce HTML ownership in the catalog and wiki. Co-authored-by: Copilot <[email protected]>

function loadComponent(ele, file_path)
{
  fetch(file_path)
    .then(response => response.text())
    .then(data => ele.innerHTML = data)
}
loadComponent(header, 'header.html');
loadComponent(footer, 'footer.html');