Narrow Linux CVarArg compatibility

[Kyle-Ye]

Summary

• Narrow the non-Darwin CVarArg compatibility conformance to NSAttributedString.
• Refresh the nearby compatibility comment to match the narrower scope.

Validation

• git diff --check

[augmentcode]

🤖 Augment PR Summary

Summary: Restricts the non-Darwin CVarArg compatibility shim from a broad NSObject conformance to only NSAttributedString.

Changes:

• Updates the non-Darwin retroactive `CVarArg` conformance to target `NSAttributedString` instead of `NSObject`
• Refreshes the nearby comment to reflect the narrower scope

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[augmentcode]

Review completed. 1 suggestion posted.

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[augmentcode]

Sources/OpenSwiftUICore/View/Text/Text/Text+Localized.swift:741-745 has appendInterpolation<Subject>(_:formatter:) where Subject: NSObject storing subject as a CVarArg via FormatArgument(value:). With the NSObject: CVarArg shim removed here, this likely won’t type-check (or will regress %@ interpolation) on non-Darwin.

Severity: high

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 26.61%. Comparing base (7f79072) to head (d1eacfc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #890      +/-   ##
==========================================
+ Coverage   26.50%   26.61%   +0.10%     
==========================================
  Files         689      684       -5     
  Lines       48193    47618     -575     
==========================================
- Hits        12774    12673     -101     
+ Misses      35419    34945     -474     

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