Add AccessibilityCore.UserSettings support

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR adds initial support for syncing system accessibility user settings into OpenSwiftUI’s environment.

Changes:

• Introduces AccessibilityCore.UserSettings to resolve UIKit/Accessibility settings (e.g. Reduce Motion, Invert Colors, Button Shapes) into EnvironmentValues.
• Adds an AccessibilityTechnologies SetAlgebra type plus environment plumbing for accessibilityEnabledTechnologies and per-technology convenience booleans.
• Marks UIKitEnvironment as complete and wires trait/environment resolution to call UserSettings.resolve.
• Begins WIP implementations for Large Content Viewer and Accessibility Quick Actions APIs (environment keys and public surface).
• Expands PlatformItemList.Item to carry merged text/label/image metadata needed by accessibility features.
• Adjusts accessibilityPlayAnimatedImages setter visibility to allow package-level updates.
• Updates the Example Xcode project to link libAccessibility.tbd for the new Accessibility symbols.

Technical Notes: The new UIKit resolver uses several private C symbols (via @_silgen_name) to read additional accessibility flags.

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[augmentcode]

Review completed. 2 suggestions posted.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 196 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.32%. Comparing base (cd3b4ff) to head (9e153a3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../Accessibility/AccessibilityLargeContentView.swift	0.00%	75 Missing ⚠️
...ftUI/Accessibility/AccessibilityTechnologies.swift	0.00%	54 Missing ⚠️
...iftUI/Accessibility/AccessibilityQuickAction.swift	0.00%	36 Missing ⚠️
...essibility/AccessibilityEnvironmentAdditions.swift	0.00%	25 Missing ⚠️
...ces/OpenSwiftUI/Integration/PlatformItemList.swift	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #824      +/-   ##
==========================================
- Coverage   27.46%   27.32%   -0.14%     
==========================================
  Files         663      667       +4     
  Lines       42510    42706     +196     
==========================================
- Hits        11674    11671       -3     
- Misses      30836    31035     +199     

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