* Adopt new reaction toggling API introduced in matrix-org/matrix-rust-sdk/pull/4127
* Adopt the changes introduced in matrix-org/matrix-rust-sdk/pull/4111: use the new `TimelineUniqueId` type instead of `String` for unique timeline identifiers.
* Bump the RustSDK to v1.0.58.
* Fix unit 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.