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/Spaces/SpaceAddRoomsScreen/View/SpaceAddRoomsScreen.swift

@@ -164,7 +164,7 @@ struct SpaceAddRoomsScreen_Previews: PreviewProvider, TestablePreview {
     static let selectedViewModel = makeViewModel(searchQuery: "Foundation", hasSelection: true)
     
     static var previews: some View {
-        NavigationStack {
+        ElementNavigationStack {
             SpaceAddRoomsScreen(context: viewModel.context)
         }
         .previewDisplayName("Suggested")
@@ -172,12 +172,12 @@ struct SpaceAddRoomsScreen_Previews: PreviewProvider, TestablePreview {
             $0.type == .suggestions && !$0.rooms.isEmpty
         })
         
-        NavigationStack {
+        ElementNavigationStack {
             SpaceAddRoomsScreen(context: searchingViewModel.context)
         }
         .previewDisplayName("Searching")
         
-        NavigationStack {
+        ElementNavigationStack {
             SpaceAddRoomsScreen(context: selectedViewModel.context)
         }
         .previewDisplayName("Selected")