fix(login): allow transition to Home only when anonymous login successful

Previously, user was transitioned to Home screen from Signin screen without completing anonymous login. So, while the login was in progress and user is in Home screen, an attempt to install an app would fail because AuthData wouldn't be available by then.

Here, user is now transitioned to Home only when the anon. login is successful. For failure, they remain in Signin screen.

To prevent the progress indicator stuck in indefinite loading, the auto-retry had to be skipped and a new login-without-retry behaviour is introduced which is only being used for first-time login.