Update _UIHostingView API

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR updates UIKit hosting integration to better track UIKit-driven state changes (traits, safe area, tint, clips) and to bridge UIKit animation blocks into OpenSwiftUI transactions.

Changes:

• Added QuartzCore shims for the private CATransactionCompletionItem and a C helper (_CATransactionCompletionItem()) to support animation completion/listener wiring.
• Extended UIKit private safe wrappers on UIView to expose current animation block state, duration, and curve.
• Expanded UIKit↔OpenSwiftUI conversion utilities (contrast, content size category, layout direction, legibility weight, size classes).
• Introduced Animation→Core Animation conversion helpers and a Transaction.currentUIViewTransaction(canDisableAnimations:) helper to synthesize transactions from UIKit animation blocks.
• Updated _UIHostingView to react to clipsToBounds, tint changes, trait changes (optionally emitting an empty transaction), and safe-area changes.
• Added an alwaysOnBridge reference to UIHostingController and a placeholder safe-area change callback hook.

Technical Notes: The new transaction bridging relies on private UIKit/QuartzCore SPI via “safe wrapper” indirection and compiles conditionally based on QuartzCore availability.

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[augmentcode]

Review completed. 1 suggestions posted.

Comment augment review to trigger a new review at any time.

[augmentcode]

UIView override hooks like tintColorDidChange() typically need to call super to preserve UIKit’s internal tint propagation/behavior; otherwise some subview updates can be skipped. This likely also applies to the new traitCollectionDidChange(_:) and safeAreaInsetsDidChange() overrides in this same block.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 14.29%. Comparing base (15e20e7) to head (d4d88fa).
⚠️ Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (15e20e7) and HEAD (d4d88fa). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (15e20e7)	HEAD (d4d88fa)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #702       +/-   ##
===========================================
- Coverage   28.75%   14.29%   -14.46%     
===========================================
  Files         589      563       -26     
  Lines       35836    33190     -2646     
===========================================
- Hits        10305     4745     -5560     
- Misses      25531    28445     +2914     

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