Fix iOS UI test case crash

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Adds a UIKit shim safe-wrapper for the private UIWindow._windowHostingScene API and switches UIHostingViewBase to use it, preventing iOS UI test crashes caused by unsafe perform/Unmanaged handling.

Notes: The wrapper returns nil when the selector isn’t available, keeping sceneActivationState guarded without runtime crashes.

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[augmentcode]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 13.14%. Comparing base (b034c16) to head (69a82eb).
⚠️ Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (b034c16) and HEAD (69a82eb). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (b034c16)	HEAD (69a82eb)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #768       +/-   ##
===========================================
- Coverage   26.21%   13.14%   -13.08%     
===========================================
  Files         649      619       -30     
  Lines       40199    36740     -3459     
===========================================
- Hits        10540     4830     -5710     
- Misses      29659    31910     +2251     

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