Fix position issue and add AsyncImage UI test case

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR expands content-transition plumbing and adds a snapshot UI test for AsyncImage, while addressing a display-list positioning issue.

Changes:

• Introduces a WIP ContentTransition implementation with environment integration and related effect/group scaffolding.
• Adds InterpolatableContent and an InterpolatedDisplayList rule to support content interpolation workflows.
• Hooks Image.Resolved into the interpolation path via InterpolatableContent and applies the interpolator group during display-list generation.
• Removes older placeholder/conflicting ContentTransitionEffect stubs and replaces an unimplemented EnvironmentValues.contentTransitionStyle extension.
• Extends snapshot testing helpers to support snapshotting platform view controllers.
• Adds an AsyncImage snapshot test plus a bundled logo.png resource for local loading.

Technical Notes: A number of transition/interpolation components are explicitly marked WIP/blocked; the current implementation focuses on wiring and positioning behavior rather than full transition semantics.

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[augmentcode]

Review completed. 1 suggestions posted.

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

[augmentcode]

In InterpolatedDisplayList.updateValue, assigning item.frame.origin to position - containerPosition overwrites any existing per-item origin from the source DisplayList (e.g. non-zero local frames from shape/image rendering). If the wrapped list isn’t guaranteed to be zero-origin, this could shift content; worth double-checking whether the intention is to translate existing origins rather than replace them.

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 201 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.86%. Comparing base (e34a6a5) to head (3c8e4a8).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...OpenSwiftUICore/Render/InterpolatableContent.swift	0.00%	85 Missing ⚠️
...ICore/Animation/Transition/ContentTransition.swift	0.00%	67 Missing ⚠️
...SwiftUI/Render/DisplayList/AppKitDisplayList.swift	0.00%	31 Missing ⚠️
...ces/OpenSwiftUICore/View/Image/ResolvedImage.swift	0.00%	11 Missing ⚠️
...enSwiftUICore/Render/DisplayList/DisplayList.swift	0.00%	5 Missing ⚠️
Sources/OpenSwiftUICore/Render/SymbolEffect.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #733      +/-   ##
==========================================
- Coverage   27.97%   27.86%   -0.12%     
==========================================
  Files         603      604       +1     
  Lines       37171    37360     +189     
==========================================
+ Hits        10399    10410      +11     
- Misses      26772    26950     +178     

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