Update BlendMode

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR advances BlendMode support by wiring blend mode into the shape-style resolution pipeline.

Changes:

• Marks BlendMode as audited/complete and adds availability gates for the public APIs.
• Expands _BlendModeShapeStyle to handle additional _ShapeStyle_Shape.Operation cases (resolve/copy/multilevel) instead of failing.
• Applies the requested blend mode to resolved style packs via ShapeStyle.Pack.modify and Style.applyBlend.
• Implements _ShapeStyle_Pack.modify and Style.applyBlend, and adjusts _ShapeStyle_Shape.stylePack’s _modify accessor to mutate safely.

Technical Notes: Blend application behavior is gated by _SemanticFeature_v6 to avoid overwriting an existing blend when the semantic feature is enabled.

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[augmentcode]

Review completed. 2 suggestions posted.

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[augmentcode]

indices(of:) currently calls _openSwiftUIUnimplementedFailure(), but _ShapeStyle_Pack.modify(...) now depends on it (and BlendMode calls modify in the .resolveStyle path), so using blendMode(_:) during style resolution will still trap at runtime.

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[augmentcode]

In the .primaryStyle operation, _BlendModeShapeStyle currently does nothing, which can cause ShapeStyle.primaryStyle(in:) to return nil even if the wrapped style provides a primary style (other wrappers like OffsetShapeStyle forward something here).

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 13.84%. Comparing base (793b5ec) to head (bd514a0).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...nSwiftUICore/Shape/ShapeStyle/ShapeStylePack.swift	0.00%	25 Missing ⚠️
...s/OpenSwiftUICore/Shape/ShapeStyle/BlendMode.swift	0.00%	23 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (793b5ec) and HEAD (bd514a0). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (793b5ec)	HEAD (bd514a0)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #682       +/-   ##
===========================================
- Coverage   28.45%   13.84%   -14.62%     
===========================================
  Files         586      560       -26     
  Lines       35480    32867     -2613     
===========================================
- Hits        10095     4549     -5546     
- Misses      25385    28318     +2933     

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