fix: branding insert needs group_name (NOT NULL column in platform_theme)

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

admin/branding.php

@@ -56,7 +56,7 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_POST['save_theme'])) {
             if (strpos($key, 'anim_') === 0 || strpos($key, 'btn_') === 0) $cat = 'animation';
             if (strpos($key, 'ludo_') === 0 || strpos($key, 'board_') === 0) $cat = 'game';
             if (strpos($key, 'juice_') === 0) $cat = 'juice';
-            $sdb->insert('platform_theme', ['id' => $key, 'category' => $cat, 'label' => $key, 'value' => $value, 'default_value' => $value, 'value_type' => (strpos($value, '#') === 0) ? 'hex' : 'string']);
+            $sdb->insert('platform_theme', ['id' => $key, 'category' => $cat, 'group_name' => 'player_app', 'label' => $key, 'value' => $value, 'default_value' => $value, 'value_type' => (strpos($value, '#') === 0) ? 'hex' : 'string']);
         }
     }
 }

api/branding.php

@@ -61,6 +61,7 @@ if ($method === 'POST') {
                 $sdb->insert('platform_theme', [
                     'id' => $key,
                     'category' => categorizeKey($key),
+                    'group_name' => 'player_app',
                     'label' => $key,
                     'value' => $value,
                     'default_value' => $value,