Building on Xcode 26 fails due to SwiftUICore import

Issue: builder-swift SDK fails to build on Xcode 26 because of `import SwiftUICore` in `CSSAlignments`.

<img width="1127" height="372" alt="Image" src="https://github.com/user-attachments/assets/fdab7c66-146b-4159-bc8c-b0df9e25d9fb" />