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/AppLock/AppLockSetupPINScreen/View/AppLockSetupPINScreen.swift

@@ -107,22 +107,22 @@ struct AppLockSetupPINScreen_Previews: PreviewProvider, TestablePreview {
                                                                       appLockService: failedService)
     
     static var previews: some View {
-        NavigationStack {
+        ElementNavigationStack {
             AppLockSetupPINScreen(context: createViewModel.context)
         }
         .previewDisplayName("Create")
         
-        NavigationStack {
+        ElementNavigationStack {
             AppLockSetupPINScreen(context: confirmViewModel.context)
         }
         .previewDisplayName("Confirm")
         
-        NavigationStack {
+        ElementNavigationStack {
             AppLockSetupPINScreen(context: unlockViewModel.context)
         }
         .previewDisplayName("Unlock")
         
-        NavigationStack {
+        ElementNavigationStack {
             AppLockSetupPINScreen(context: unlockFailedViewModel.context)
         }
         .previewDisplayName("Unlock Failed")