Add OpenSwiftUI attributed string and text scale support

[Kyle-Ye]

Summary

• Add AttributeScopes.OpenSwiftUIAttributes and OpenSwiftUI attributed string attribute definitions.
• Implement attributed-string-backed Text storage, style transfer, platform attributed string conversion, and localized formatting support.
• Add Text.Scale APIs and tests.
• Add non-Darwin inline presentation intent shims needed for Linux attributed string support.

[codecov]

Codecov Report

❌ Patch coverage is 4.60705% with 352 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.68%. Comparing base (1d01474) to head (2ee5de6).

Files with missing lines	Patch %	Lines
.../Text/AttributedString/Text+AttributedString.swift	0.00%	208 Missing ⚠️
...penSwiftUICore/View/Text/Text/Text+Localized.swift	0.00%	66 Missing ⚠️
...nSwiftUICore/View/Text/Util/String+Extension.swift	0.00%	51 Missing ⚠️
...es/OpenSwiftUICore/View/Text/Text/Text+Scale.swift	53.84%	12 Missing ⚠️
...wiftUICore/View/Text/Text/TextNonDarwinShims.swift	16.66%	10 Missing ⚠️
Sources/OpenSwiftUI/Util/OpenSwiftUIGlue.swift	0.00%	3 Missing ⚠️
...SwiftUICore/View/Text/Text/TextUnimplemented.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #892      +/-   ##
==========================================
- Coverage   26.77%   26.68%   -0.09%     
==========================================
  Files         690      693       +3     
  Lines       48287    48651     +364     
==========================================
+ Hits        12929    12984      +55     
- Misses      35358    35667     +309     

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[augmentcode]

🤖 Augment PR Summary

Summary: This PR adds foundational support for attributed-string-backed Text rendering and introduces a logical text scaling API.

Changes:

• Added Text initializer for AttributedString backed by a new AttributedStringTextStorage.
• Introduced AttributeScopes.OpenSwiftUIAttributes and a set of OpenSwiftUI-specific attributed string keys (font, colors, underline/strikethrough styles, tracking/kern, baseline offset, text scale, etc.).
• Implemented conversion utilities to merge OpenSwiftUI styles/modifiers into a platform NSAttributedString, including redaction and locale-based case conversion.
• Added Darwin/non-Darwin shims for inline presentation intent and related NSAttributedString.Key values to support Linux attributed strings.
• Extended localized formatting/inflection logic to preserve attributed-string styling through token substitution on Darwin.
• Added Text.Scale and textScale APIs for both Text and View, plus unit tests.

Technical Notes: The implementation relies on attribute transfer/merging during NSAttributedString conversion and adds new resolved-text property hooks (e.g., scale, superscript, custom attributes) to support these features.

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[augmentcode]

Review completed. 3 suggestions posted.

Comment augment review to trigger a new review at any time.

[augmentcode]

Sources/OpenSwiftUICore/View/Text/AttributedString/Text+AttributedString.swift:542 — convertToPlatformStyled mutates the same NSMutableAttributedString (setAttributes / replaceCharacters) from inside enumerateAttributes, which is generally unsafe and can lead to skipped ranges or runtime exceptions. This is especially risky because caseConvertedIfNeeded can change the string length, making subsequent range values invalid.

Severity: high

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[augmentcode]

Sources/OpenSwiftUICore/View/Text/Text/TextUnimplemented.swift:9 — This Text.strikethrough implementation is a silent no-op, so .inlinePresentationIntent(.strikethrough) processing in withInlinePresentationIntent(from:) won’t have any visible effect and could mask missing behavior.

Severity: medium

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[augmentcode]

Sources/OpenSwiftUICore/View/Text/Text/TextUnimplemented.swift:14 — BoldTextModifier / MonospacedTextModifier don’t override modify(style:environment:) or isEqual(to:), so if they’re ever evaluated (e.g., Text equality via .anyTextModifier), they’ll hit AnyTextModifier’s abstract-method trap at runtime.

Severity: high

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