fix: show zone transfer failures and rename errors in UIError overlay

- SMSG_TRANSFER_ABORTED: all zone/instance portal rejection reasons shown as UIError
  (expansion required, instance full, too many instances, zone in combat, etc.)

src/game/game_handler.cpp

@@ -5528,6 +5528,7 @@ void GameHandler::handlePacket(network::Packet& packet) {
                 case 0x0C: abortMsg = "Transfer aborted."; break;
                 default:   abortMsg = "Transfer aborted."; break;
             }
+            addUIError(abortMsg);
             addSystemChatMessage(abortMsg);
             break;
         }