function buildNavigation($user) {
$links = ['Account', 'Forms'];
if (!empty($user) && (int)($user['is_admin'] ?? 0) === 1) {
$links[] = 'Plans';
$links[] = 'Users';
$links[] = 'Roles';
$links[] = 'Pages';
$links[] = 'Publishing';
$links[] = 'Settings';
$links[] = 'Security';
$links[] = 'Audit Log';
$links[] = 'UI';
}
$links[] = 'Logout';
return implode(' | ', $links);
}