Space flow improvements. (#4430)

* Space flow improvements

- Use a state machine to select a space.
- Add a SpaceFlowCoordinator for recursively presenting subspaces.
- Get the spaceRoomListProxy when tapping on the space so we can indicate failures.
- Fix the total room count in SpaceListScreen.

* Refactor spaceRoom → spaceRoomProxy.

* Add a UI test for the Spaces flow.

ElementX/Sources/UITests/UITestsAppCoordinator.swift

@@ -577,14 +577,19 @@ class MockScreen: Identifiable {
                                                                             appSettings: ServiceLocator.shared.settings,
                                                                             mediaProvider: MediaProviderMock(configuration: .init()))
             return SessionVerificationScreenCoordinator(parameters: parameters)
-        case .userSessionScreen, .userSessionScreenReply:
+        case .userSessionScreen, .userSessionScreenReply, .userSessionSpacesFlow:
             let appSettings: AppSettings = ServiceLocator.shared.settings
             appSettings.hasRunIdentityConfirmationOnboarding = true
             appSettings.hasRunNotificationPermissionsOnboarding = true
             appSettings.analyticsConsentState = .optedOut
+            appSettings.spacesEnabled = true
             
             let clientProxy = ClientProxyMock(.init(userID: "@mock:client.com", deviceID: "MOCKCLIENT", roomSummaryProvider: RoomSummaryProviderMock(.init(state: .loaded(.mockRooms)))))
             
+            // The tab bar remains hidden for the non-spaces tests as we don't supply any mock spaces.
+            let spaceServiceProxy = SpaceServiceProxyMock(id == .userSessionSpacesFlow ? .populated : .init())
+            clientProxy.spaceService = spaceServiceProxy
+            
             let appMediator = AppMediatorMock.default
             appMediator.underlyingWindowManager = windowManager
             

ElementX/Sources/UITests/UITestsScreenIdentifier.swift

@@ -47,6 +47,7 @@ enum UITestsScreenIdentifier: String {
     case startChatWithSearchResults
     case userSessionScreen
     case userSessionScreenReply
+    case userSessionSpacesFlow
     case autoUpdatingTimeline
 }