Implement ViewTransform coordinate-space conversions

[Kyle-Ye]

Summary

• complete ViewTransform storage, traversal, and coordinate-space conversion behavior
• apply transforms to geometry and scroll-view clipping queries
• update coordinate-space support and add focused ViewTransform coverage

Testing

• ViewTransformTests pass on macOS and Linux

[codecov]

Codecov Report

❌ Patch coverage is 58.60349% with 166 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.18%. Comparing base (b57a145) to head (174d81c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...es/OpenSwiftUICore/Layout/View/ViewTransform.swift	63.34%	136 Missing ⚠️
...Layout/CoordinateSpace/ScrollCoordinateSpace.swift	0.00%	25 Missing ⚠️
Sources/OpenSwiftUICore/Shape/Path.swift	0.00%	4 Missing ⚠️
...enSwiftUICore/Layout/Geometry/GeometryReader.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #963      +/-   ##
==========================================
+ Coverage   26.70%   27.18%   +0.48%     
==========================================
  Files         730      730              
  Lines       52920    53093     +173     
==========================================
+ Hits        14133    14435     +302     
+ Misses      38787    38658     -129     

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