test(about): assert integrations status through the real render

HellionChat/Ui/Windows/SettingsWindow.cs

@@ -112,4 +112,8 @@ internal sealed class SettingsWindow : Window
                 break;
         }
     }
+
+    // AboutTab is owned here (not MainWindow) and rendered only via the private
+    // RenderActiveTab; this exposes it for the integrations-status SelfTest.
+    internal AboutTab GetAboutTabForSelfTest() => _about;
 }