Switch PHP views to Twig and add 2FA/UI enhancements

Migrate many view templates from raw PHP to Twig and modernize UI/UX for 2FA and settings. Controllers updated to provide avatar data and two-factor info (ProfileController, UserController) and SettingsController now includes timezone lists, notification preset selection, cron path, cached update state and rollback availability. ErrorHandler now attempts to render error pages via a new Core\TwigService with a safe fallback to raw PHP views. TwoFactorService generation silences deprecated warnings during QR code creation. Numerous .php view files were removed and replaced with .twig equivalents (2fa setup/verify/backup-codes and many auth, dashboard, domains, errors, layout, users, tags, tld-registry, etc.), and core/TwigService was added. These changes move the app toward a Twig-based templating system, improve 2FA flows, surface avatar images in lists/profiles, and make error rendering more robust.

app/Controllers/UserController.php

@@ -49,6 +49,11 @@ class UserController extends Controller
         
         // Get filtered users
         $users = $this->userModel->getFiltered($filters, $sort, strtoupper($order), $perPage, $offset);
+
+        foreach ($users as &$u) {
+            $u['avatar'] = \App\Helpers\AvatarHelper::getAvatar($u, 40);
+        }
+        unset($u);
         
         $this->view('users/index', [
             'users' => $users,
@@ -240,6 +245,17 @@ class UserController extends Controller
         // Get 2FA status
         $twoFactorStatus = $this->userModel->getTwoFactorStatus($userId);
 
+        // Avatar for profile header
+        $userAvatar = \App\Helpers\AvatarHelper::getAvatar($user, 64);
+
+        // Registrar distribution
+        $registrarCounts = [];
+        foreach ($domains as $d) {
+            $reg = !empty($d['registrar']) ? $d['registrar'] : 'Unknown';
+            $registrarCounts[$reg] = ($registrarCounts[$reg] ?? 0) + 1;
+        }
+        arsort($registrarCounts);
+
         $this->view('users/show', [
             'title' => htmlspecialchars($user['full_name']) . ' - User Profile',
             'user' => $user,
@@ -248,6 +264,8 @@ class UserController extends Controller
             'tags' => $tags,
             'groups' => $groups,
             'twoFactorStatus' => $twoFactorStatus,
+            'userAvatar' => $userAvatar,
+            'registrarCounts' => $registrarCounts,
         ]);
     }