Implement ScaleEffect and ScaleTransition

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR adds a scale geometry effect and corresponding scale transitions to OpenSwiftUI.

Changes:

• Introduces _ScaleEffect as a GeometryEffect that produces a scaling ProjectionTransform around a configurable UnitPoint anchor.
• Adds View.scaleEffect overloads for CGSize, uniform CGFloat, and separate x/y scaling.
• Implements AnyTransition.scale and a new ScaleTransition type (v5+) for insertion/removal scaling.
• Wires ScaleTransition into content-transition effects via _makeContentTransition.
• Adds Protobuf serialization support for _ScaleEffect.
• Includes a small formatting cleanup in ContentTransition.swift.

Technical Notes: The new transition emits a scale effect list when the transition operation requests effects, and otherwise reports that it supports content transitions.

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[augmentcode]

Review completed. 2 suggestions posted.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 13.91%. Comparing base (eb66fb3) to head (c58eb3c).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...wiftUICore/Render/GeometryEffect/ScaleEffect.swift	0.00%	57 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (eb66fb3) and HEAD (c58eb3c). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (eb66fb3)	HEAD (c58eb3c)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #734       +/-   ##
===========================================
- Coverage   27.83%   13.91%   -13.93%     
===========================================
  Files         604      579       -25     
  Lines       37360    34557     -2803     
===========================================
- Hits        10401     4807     -5594     
- Misses      26959    29750     +2791     

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