Add voice & video calling to a Flutter app with the CometChat v6 UI Kit — turn calling on in settings, wire the native config and the root navigatorKey (the kit presents incoming/outgoing call screens itself), and add call-log surfaces. Triggers: 'add voice and video calls in flutter', 'add calling to my flutter chat', 'enable video call flutter', 'add call buttons flutter', 'show call logs flutter'.
