Link new device with QR code tweaks. (#5563)

* Hook up Rust's InvalidCheckCode failure to the right state when linking a new device.

* Automatically regenerate a new QR code instead of ending the flow when it expires.

UnitTests/Sources/QRCodeLoginScreenViewModelTests.swift

@@ -9,6 +9,7 @@
 import Combine
 @testable import ElementX
 import MatrixRustSDKMocks
+import SwiftUI
 import Testing
 
 @MainActor
@@ -18,6 +19,7 @@ struct QRCodeLoginScreenViewModelTests {
     var qrLoginProgressSubject: CurrentValueSubject<QRLoginProgress, AuthenticationServiceError>!
     var qrCodeLoginService: QRCodeLoginServiceMock!
     
+    var regeneratedQRCodeImage: UIImage!
     var linkMobileProgressSubject: CurrentValueSubject<LinkNewDeviceService.LinkMobileProgress, QRCodeLoginError>!
     var linkDesktopProgressSubject: CurrentValueSubject<LinkNewDeviceService.LinkDesktopProgress, QRCodeLoginError>!
     var linkNewDeviceService: LinkNewDeviceServiceMock!
@@ -202,6 +204,17 @@ struct QRCodeLoginScreenViewModelTests {
         try await deferredAction.fulfill()
     }
     
+    @Test
+    mutating func linkMobileDeviceQRCodeExpiry() async throws {
+        setup(mode: .linkMobile)
+        #expect(context.viewState.state.isDisplayQR)
+        
+        let deferred = deferFulfillment(context.$viewState, keyPath: \.state, transitionValues: [.displayQR(.expired),
+                                                                                                 .displayQR(.active(regeneratedQRCodeImage))])
+        linkMobileProgressSubject.send(completion: .failure(.expired))
+        try await deferred.fulfill()
+    }
+    
     // MARK: - Helpers
     
     private mutating func setup(mode: Mode) {
@@ -214,6 +227,11 @@ struct QRCodeLoginScreenViewModelTests {
         linkNewDeviceService = LinkNewDeviceServiceMock(.init(linkMobileProgressPublisher: linkMobileProgressSubject.asCurrentValuePublisher(),
                                                               linkDesktopProgressPublisher: linkDesktopProgressSubject.asCurrentValuePublisher()))
         
+        regeneratedQRCodeImage = LinkNewDeviceServiceMock.mockQRCodeImage
+        let clientProxy = ClientProxyMock(.init())
+        clientProxy.linkNewDeviceServiceReturnValue = LinkNewDeviceServiceMock(.init(linkMobileProgressPublisher: .init(.qrReady(regeneratedQRCodeImage)),
+                                                                                     linkDesktopProgressPublisher: .init(.starting)))
+        
         let screenMode: QRCodeLoginScreenMode
         switch mode {
         case .login:
@@ -221,7 +239,7 @@ struct QRCodeLoginScreenViewModelTests {
         case .linkDesktop:
             screenMode = .linkDesktop(linkNewDeviceService)
         case .linkMobile:
-            screenMode = .linkMobile(linkNewDeviceService.linkMobileDevice())
+            screenMode = .linkMobile(linkNewDeviceService.linkMobileDevice(), clientProxy)
         }
         
         appMediator = AppMediatorMock.default