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/CallScreen/View/CallScreen.swift

@@ -17,7 +17,7 @@ struct CallScreen: View {
     @ObservedObject var context: CallScreenViewModel.Context
     
     var body: some View {
-        NavigationStack {
+        ElementNavigationStack {
             content
                 .frame(maxWidth: .infinity, maxHeight: .infinity)
                 .background(Color.compound.bgCanvasDefault.ignoresSafeArea())