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

fastlane/Fastfile

@@ -98,7 +98,7 @@ lane :accessibility_tests do |options|
   
   run_tests(
     scheme: "AccessibilityTests",
-    device: "iPhone 16 (18.5)", # The tests are randomly crashing on iOS 26
+    device: "iPhone 17 (#{simulator_version})",
     ensure_devices_found: true,
     prelaunch_simulator: false,
     result_bundle: true,
@@ -338,4 +338,4 @@ private_lane :create_simulator_if_necessary do |options|
   end
   
   # device_id is unused right now but is useful to check e.g. the boot status of a simulator.
-end
+end