fix: guest profile shows 'ضيف' instead of default DB name

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

api/auth.php

@@ -152,10 +152,15 @@ function handleGuest(): void {
 
     $userId = $data['user']['id'];
 
-    // Create guest profile
+    // Ensure guest profile has proper display name
     $sdb = supabaseService();
-    $existing = $sdb->get('profiles', ['id' => 'eq.' . $userId, 'select' => 'id', 'limit' => 1]);
-    if (empty($existing) || isset($existing['error'])) {
+    $existing = $sdb->get('profiles', ['id' => 'eq.' . $userId, 'select' => 'id,display_name', 'limit' => 1]);
+    if (is_array($existing) && !isset($existing['error']) && !empty($existing)) {
+        $current = $existing[0];
+        if (!$current['display_name'] || $current['display_name'] === 'لاعب جديد' || $current['display_name'] === 'Player') {
+            $sdb->update('profiles', ['display_name' => 'ضيف', 'username' => 'guest_' . substr($userId, 0, 8)], ['id' => 'eq.' . $userId]);
+        }
+    } else {
         $sdb->insert('profiles', [
             'id' => $userId,
             'display_name' => 'ضيف',