[Kyle-Ye]

Fixes #1140.

Summary

macOS button labels differ from SwiftUI at the glyph edges because
renderKeyedText draws the alpha-only mask with white. macOS font smoothing uses
the fill color when it computes glyph coverage, including in an alpha-only
context.

• Use the resolved linear RGB with alpha 1 for solid fills in macOS text masks.
• Use black in light mode or white in dark mode for other fills on macOS.
• Keep white masks on other platforms and apply the style opacity in the
  existing rendering layer.

Validation

Both Button interaction cases passed on macOS 15.7.3 with the OpenSwiftUI
renderer and IAG. All six snapshots matched the unchanged SwiftUI references;
the action-count and disabled-action assertions also passed. This validation
was completed before the rebase onto the current main and has not been
repeated after it.

A standalone text probe confirmed color-dependent alpha coverage on macOS
15.7.3 with font smoothing enabled. The equivalent iOS 18.5 probe was
color-independent.

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Ran test modules	Commit
Unknown	⏳	7	22b10be26
OpenSwiftUI	✅	7	22b10be26

Builds 🔨

Scheme	Status	Duration	Commit
OpenSwiftUI	✅	54.2s	22b10be26

[codecov]

Codecov Report

❌ Patch coverage is 0% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.00%. Comparing base (419664e) to head (13b2806).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...tUICore/Shape/ShapeStyle/ShapeStyleRendering.swift	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1141      +/-   ##
==========================================
- Coverage   30.01%   30.00%   -0.01%     
==========================================
  Files         921      921              
  Lines       73240    73254      +14     
==========================================
+ Hits        21982    21983       +1     
- Misses      51258    51271      +13     

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[Kyle-Ye]

/interactiontest macos openswiftui-renderer-iag