[Bug Fix] Fix UIImage to Image environment override issue

[Kyle-Ye]

Fix ImageConversionsUITests.platformImageNamed failure on iOS

[augmentcode]

🤖 Augment PR Summary

Summary: Fixes an iOS-only failure in ImageConversionsUITests.platformImageNamed by improving how UIKit trait collections are overridden/resolved from OpenSwiftUI environment values (notably for image/asset evaluation).

Changes:

• Adds C shims for missing/private UIKit symbols (_UIBacklightLuminance, _UIUserInterfaceVibrancy) and a safe-wrapper category for additional UITraitCollection private accessors.
• Expands UITraitCollection.resolvedTraitCollection to copy more environment fields into UIMutableTraits (Dynamic Type, color scheme/style, gamut, size classes, contrast, etc.).
• Implements UITraitCollection.resolvedEnvironment(base:) to derive OpenSwiftUI environment values back from UIKit traits (luminance reduction, fidelity, corner radius, materials/vibrancy, etc.).
• Introduces EnvironmentValues.updateFidelity and EnvironmentValues.inheritedTraitCollection helpers to support caching/trait inheritance.
• Adds a UIKit bridge for TypesettingConfiguration via TypesettingConfigurationKey + trait read/write.
• Refactors Dynamic Type conversion helpers to share package-level implementations.
• Makes Material.thick available at package scope and tightens other internal material access.
• Replaces an unimplemented failure with an unreachable-code marker in UIImageConversions.

Technical Notes: The new logic relies on safe wrappers around private UIKit selectors to avoid hard failures when running on OS versions without those APIs.

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[augmentcode]

Review completed. 3 suggestions posted.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 27.45%. Comparing base (b1ac85f) to head (f88b951).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #823   +/-   ##
=======================================
  Coverage   27.44%   27.45%           
=======================================
  Files         663      663           
  Lines       42510    42510           
=======================================
+ Hits        11668    11672    +4     
+ Misses      30842    30838    -4     

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