designtopack/public/site/controllers/site.php

<?php

return function ($page, $kirby, $site) {
  $data = $page->toArray();
  $data['template'] = (string) $page->template();
  $data['newInspirations'] = (bool) page('inspirations')->children()->findBy('new', 'true');

  if ($kirby->user()) {
    $userData = [
      "role" => (string) $kirby->user()->role(),
      "uuid" => (string) $kirby->user()->uuid()
    ];
  
    if ($kirby->user()->client()->exists() && $kirby->user()->client()->isNotEmpty()) {
      $userData['client'] = [
        "name" => (string) $kirby->user()->client()->toPage()->title(),
        "uuid" => (string) $kirby->user()->client()->toPage()->uuid()
      ];
    }
  }


  return [
    'genericData' => $data,
    'userData' => $userData ?? null
  ];
};