Not Getting login callback in manager app when we use modern interfce

Hi @Anton
we are doing some customization in manager app, manager app uses this url by defalut - https://demo.traccar.org/ with this url we get login call back in manager app here

inner class AppInterface {
    @JavascriptInterface
    fun postMessage(message: String) {
        if (message.contains("login")) {
            broadcastManager.sendBroadcast(Intent(EVENT_LOGIN))
        }
    }
}

but the problem is when we login through modern ui - https://demo.traccar.org/modern/#/login we don't get any login call back.
we have our own server demo.traccar.org this is just for example

It's not implemented in the modern app yet. Feel free to send a pull request if you implement it.