feat(text): add date, selection, and size-fitting support

[Kyle-Ye]

Summary

• Implement date styles and serialization with matching availability and documentation.
• Add date and timer interpolation, current-date formatting, and progress interval text.
• Add text selectability types and connect platform text representations.
• Implement size-dependent text variants with fit checks, cache reuse, and layout integration.
• Add regression coverage for date formatting, serialization, interpolation, and size-fitting invalidation.

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Ran test modules	Commit
OpenSwiftUI	✅	7	3e60cf5a9

Builds 🔨

Scheme	Status	Duration	Commit
OpenSwiftUI	✅	53.8s	3e60cf5a9

[codecov]

Codecov Report

❌ Patch coverage is 35.52426% with 412 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.69%. Comparing base (018f209) to head (9e9bea5).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...nSwiftUICore/View/Text/Text/Text+SizeFitting.swift	13.60%	273 Missing ⚠️
...ces/OpenSwiftUICore/View/Text/Text/Text+View.swift	0.00%	76 Missing ⚠️
...tUICore/View/Text/Resolve/ResolvableProgress.swift	0.00%	25 Missing ⚠️
...ces/OpenSwiftUICore/View/Text/Text/Text+Date.swift	89.47%	20 Missing ⚠️
...penSwiftUICore/View/Text/Text/Text+Selection.swift	0.00%	15 Missing ⚠️
...penSwiftUICore/Util/StandardLibraryAdditions.swift	0.00%	2 Missing ⚠️
.../OpenSwiftUICore/Data/Util/ScrapeableContent.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1110      +/-   ##
==========================================
- Coverage   33.70%   33.69%   -0.02%     
==========================================
  Files         799      807       +8     
  Lines       62211    64608    +2397     
==========================================
+ Hits        20969    21767     +798     
- Misses      41242    42841    +1599     

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