Fix A11y tests (#5104)

* replace NavigationStack with ElementNavigationStack to allow the content to be rendered without a NavigationStack in a11y tests

* fix a11y tests

* update xcodeproject

* swiftformat fix

* use iOS 26.1 for CI

* use a wrapper to solve the issue for a11y tests

* ElementNavigationStack only uses the trick in DEBUG mode, and added a swiftlint rule to prevent the usage of NavigationStack

ElementX/Sources/Screens/Onboarding/IdentityConfirmationScreen/View/IdentityConfirmationScreen.swift

@@ -119,7 +119,7 @@ struct IdentityConfirmationScreen_Previews: PreviewProvider, TestablePreview {
     static var loadingViewModel = makeViewModel(recoveryState: .unknown)
     
     static var previews: some View {
-        NavigationStack {
+        ElementNavigationStack {
             IdentityConfirmationScreen(context: viewModel.context)
         }
         .previewDisplayName("Actions")
@@ -127,7 +127,7 @@ struct IdentityConfirmationScreen_Previews: PreviewProvider, TestablePreview {
             actions?.contains([.interactiveVerification, .recovery]) == true
         })
         
-        NavigationStack {
+        ElementNavigationStack {
             IdentityConfirmationScreen(context: loadingViewModel.context)
         }
         .previewDisplayName("Loading")