* Fail configuration of the authentication service if the homeserver doesn't support login.
* Move the ServerSelectionCoordinator logic into the ViewModel.
- Handle the new login alert.
- Add more tests
* Don't query the homeserver until confirming it (or selecting a different one).
* Setup the infrastructure to test AuthenticationService.
Implement basic tests for configuration & password login.
* Use the real AuthenticationService with a mock Client in all of the tests.
* Add tests for the ServerConfirmationScreenViewModel.
* Remove redundant view state and test for it.
