[BUG] 'UIScreen' is unavailable in visionOS

[seldon1000]

New issue checklist

• I have reviewed the README and documentation
• I have searched existing issues and this is not a duplicate
• I have attempted to reproduce the issue and include an example project.

General information

• Superwall version: 3.12.0+
• visionOS version(s): 1.0+
• Xcode version: 16.1
• Devices/Simulators affected: Apple Vision Pro

Describe the bug

It is not possible to build for visionOS destinations. 'UIScreen' is unavailable in visionOS, in class SWWebView.

[anglinb]

Hey @seldon1000 ! Thanks for the report--I think we had support but didn't realize we broke visionOS when we added the screen rect. Should be an easy fix: @yusuftor