Fix named image mask rendering and load system vector image issue

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR fixes image mask rendering and improves system vector image loading, while adding coverage for named image rendering modes.

Changes:

• Implements shape-style rendering for .image(GraphicsImage) by tinting via maskColor instead of crashing as unimplemented.
• Adds Image.renderingMode(_:) support, including logic to toggle template behavior and SF Symbol multicolor resolution.
• Adjusts GraphicsImage.styleResolverMode handling when contents is nil vs other content types.
• Fixes CoreUI vector glyph lookup for named/system images by changing asset matching and tidying vector info loading/caching.
• Removes a stale TODO marker for Image.NamedResolved.
• Adds new example views and snapshot UI tests covering .original vs .template rendering modes for a named asset.

Technical Notes: Template rendering relies on GraphicsImage.maskColor/contentsMultiplyColor to implement tinting/masking for non-vector images, while vector glyphs are handled via symbol rendering modes.

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[augmentcode]

Review completed. 1 suggestion posted.

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[augmentcode]

The condition that sets context.symbolRenderingMode = .multicolor triggers whenever the effective template mode is non-template, which also includes the renderingMode: nil (reset-to-default) case; that may unintentionally change default SF Symbol behavior compared to not calling renderingMode at all. (Also applies to the same logic in resolveNamedImage below.)

Severity: medium

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[codecov]

Codecov Report

❌ Patch coverage is 4.00000% with 48 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.48%. Comparing base (bf0ff05) to head (419b9c7).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...penSwiftUICore/View/Image/ImageRenderingMode.swift	0.00%	27 Missing ⚠️
...ources/OpenSwiftUICore/View/Image/NamedImage.swift	0.00%	15 Missing ⚠️
...tUICore/Shape/ShapeStyle/ShapeStyleRendering.swift	0.00%	6 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #815   +/-   ##
=======================================
  Coverage   27.47%   27.48%           
=======================================
  Files         660      661    +1     
  Lines       42405    42429   +24     
=======================================
+ Hits        11652    11661    +9     
- Misses      30753    30768   +15     

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