Add ShadowStyle support

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Adds initial ShadowStyle support so shape styles can carry drop/inner shadow effects.

API: Documents ShadowStyle.drop/inner and introduces ShapeStyle.shadow(_:) helpers.

Pipeline: _ShadowShapeStyle stores resolved shadow effects in ShapeStyle.Pack.

Rendering: ShapeStyleRendering begins translating style shadow effects into GraphicsFilter.shadow.

Tests: Updates shape snapshot tests and adds a dedicated shadow snapshot case.

Dev tooling: Tweaks Example schemes’ environment variables for print-tree/debug toggles.

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[augmentcode]

Review completed. 1 suggestions posted.

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[augmentcode]

The codebase reads OPENSWIFTUI_PRINT_TREE (e.g. DisplayListViewRenderer/DisplayListViewUpdater), but this scheme now defines SWIFTUI_PRINT_TREE, so enabling it won’t trigger tree printing. Consider aligning the environment variable key (or providing both) so the scheme matches runtime behavior.

Severity: low

Other Locations

• Example/Example.xcodeproj/xcshareddata/xcschemes/OSUI_Example.xcscheme:70
• Example/Example.xcodeproj/xcshareddata/xcschemes/SUI_Example.xcscheme:70
• Example/Example.xcodeproj/xcshareddata/xcschemes/SUI_HostingExample.xcscheme:57

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 13.17%. Comparing base (89576ec) to head (a512488).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...tUICore/Shape/ShapeStyle/ShapeStyleRendering.swift	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #776      +/-   ##
==========================================
+ Coverage   13.14%   13.17%   +0.02%     
==========================================
  Files         619      619              
  Lines       36740    36745       +5     
==========================================
+ Hits         4831     4840       +9     
+ Misses      31909    31905       -4     

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