Add Text formatter storage support

[Kyle-Ye]

Agent Summary

Adds formatter-backed Text storage support and format-style handling for OpenSwiftUI text initialization.

Changes

• Add Text initializers backed by Formatter and FormatStyle storage.
• Resolve format-style output using environment locale, calendar, time zone, interface idiom, text alignment, capitalization context, and text size variant.
• Add size-variant helpers for Foundation.FormatStyle and TextSizeVariant.
• Add focused formatter storage tests.
• Add a reusable Shared TextFormatStyleExample and a disabled UI snapshot test covering the documented date format-style example.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR implements formatter- and format-style-backed storage for Text, enabling OpenSwiftUI to initialize and resolve text from Foundation Formatter and FormatStyle values.

Changes:

• Adds Text initializers for Formatter (NSObject and ReferenceConvertible subjects) plus new storage types that resolve via the current EnvironmentValues.
• Implements Text(_:format:) for FormatStyle outputs to both String (v3) and AttributedString (v6), including environment-driven resolution (locale, calendar, time zone, interface idiom, alignment, capitalization context).
• Introduces size-variant adaptation helpers (SizeAdaptiveFormatStyle, FormatStyle.sizeVariant/exactSizeVariant) and a TextSizeVariant.adjust() utility.
• Adds focused unit tests for formatter storage and format-style storage behavior/equality.
• Adds a reusable shared example view plus a disabled snapshot UI test covering the documented date format-style example.

Technical Notes: Format resolution is environment-sensitive and includes platform-specific handling for converting AttributedString to NSAttributedString when needed.

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[augmentcode]

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[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 32 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.79%. Comparing base (7f79072) to head (affe110).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...penSwiftUICore/View/Text/Text/Text+Formatter.swift	71.76%	24 Missing ⚠️
...iew/Text/FormatStyle/SizeAdaptiveFormatStyle.swift	27.27%	8 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #891      +/-   ##
==========================================
+ Coverage   26.50%   26.79%   +0.28%     
==========================================
  Files         689      690       +1     
  Lines       48193    48287      +94     
==========================================
+ Hits        12774    12938     +164     
+ Misses      35419    35349      -70     

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