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.

ElementX/Sources/Services/Authentication/AuthenticationServiceProtocol.swift

@@ -111,6 +111,7 @@ enum QRCodeLoginError: Error, Equatable {
     case providerNotAllowed(scannedProvider: String, allowedProviders: [String])
     case cancelled
     case connectionInsecure
+    case invalidCheckCode
     case declined
     case linkingNotSupported
     case expired

ElementX/Sources/Services/Authentication/LinkNewDeviceService.swift

@@ -195,8 +195,10 @@ extension LinkNewDeviceService.LinkDesktopProgress: CustomStringConvertible {
 private extension QRCodeLoginError {
     init(rustError: HumanQrGrantLoginError) {
         self = switch rustError {
-        case .InvalidCheckCode, .ConnectionInsecure:
+        case .ConnectionInsecure:
             .connectionInsecure
+        case .InvalidCheckCode:
+            .invalidCheckCode
         case .UnsupportedProtocol:
             .linkingNotSupported
         case .Expired, .NotFound, .DeviceNotFound:
@@ -227,13 +229,6 @@ class CheckCodeSenderProxy: Equatable {
     func send(code: UInt8) async throws {
         try await underlyingSender.send(code: code)
     }
-    
-    /// Bypassed for now whilst we wait for an SDK update (however its worth noting that
-    /// things should still fail if the wrong code is provided, just not necessarily with
-    /// the right error being shown). https://github.com/matrix-org/matrix-rust-sdk/pull/5957
-    func validate(checkCode: UInt8) -> Bool {
-        true
-    }
 }
 
 extension UIImage {