test(ios): cover context erasure and native capability restrictions

Add Apple-platform tests without presenting them as Linux results. Improve native dark-mode contrast and keep the portable policy suite separate from WebKit tests. Swift formatting and syntax checks pass; Xcode execution remains required.

ios/project.yml

@@ -26,7 +26,7 @@ targets:
         NSCameraUsageDescription: Take a photo to upload to your Yuvomi server.
         NSPhotoLibraryUsageDescription: Choose photos to upload to your Yuvomi server.
         NSLocalNetworkUsageDescription: Connect to the private Yuvomi server you configure.
-        ITSAppUsesNonExemptEncryption: NO
+        ITSAppUsesNonExemptEncryption: false
         UISupportedInterfaceOrientations:
           - UIInterfaceOrientationPortrait
           - UIInterfaceOrientationLandscapeLeft