Fix NamedImage crash for bundle image

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: Addresses a crash when resolving named images (e.g. Image(decorative:)) by refining CoreUI-backed asset catalog lookup and trait handling.

Changes:

• Add CoreUI ↔︎ OpenSwiftUI bridging for template rendering mode and size classes.
• Update NamedImage bitmap lookup to support bundle, system, and private-system catalogs and to encode size-class traits using CoreUI raw values.
• Introduce initial (WIP) vector-image plumbing (VectorImageLayer/VectorImageContents) and attempt to use preserved vector representations when available.
• Add a decorative named-image example view and a snapshot UI test to prevent regressions.

Notes: Vector resolution is gated behind OPENSWIFTUI_LINK_COREUI and isLinkedOnOrAfter(.v3); the example app’s default content now renders the new named-image example.

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[augmentcode]

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[codecov]

Codecov Report

❌ Patch coverage is 23.85321% with 83 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.51%. Comparing base (1e46475) to head (65654d2).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ources/OpenSwiftUICore/View/Image/NamedImage.swift	28.57%	40 Missing ⚠️
.../OpenSwiftUICore/View/Image/VectorImageLayer.swift	0.00%	26 Missing ⚠️
...re/Data/EnvironmentKeys/EnvironmentAdditions.swift	37.03%	17 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #814      +/-   ##
==========================================
+ Coverage   27.38%   27.51%   +0.12%     
==========================================
  Files         659      660       +1     
  Lines       42366    42405      +39     
==========================================
+ Hits        11604    11667      +63     
+ Misses      30762    30738      -24     

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