Add initial OpenSwiftUI render support

[Kyle-Ye]

No description provided.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR adds an initial, platform-backed rendering path for OpenSwiftUI based on DisplayList view updating, including early async-layer support.

Changes:

• Updates the example app to run a new AsyncRenderExample to exercise transitions/animations
• Adds DisplayList feature tracking (e.g. views/animations/dynamic content) and additional transform helpers
• Introduces an async layer abstraction (DisplayListAsyncLayer) and expands the view cache to support async updates
• Adds a large DisplayList.ViewUpdater overhaul with container management, subtree skipping, and async render flow
• Builds out platform view utilities (subviews/add/remove/frame/geometry/shadow/clip/mask) and a missing-platform-view fallback
• Adds a new MaskLayer implementation for non-rect clip masks
• Implements Path.isEmpty and Path.boundingRect for several storage variants
• Refines ResolvedStyledText dynamic detection/scheduling wiring
• Adjusts imports/guards for render-only dependencies and adds QuartzCore private shims needed by the renderer
• Adds unit tests for DisplayList.Item.matchesTopLevelStructure

Technical Notes: The renderer relies on QuartzCore/CoreView shims on Darwin and introduces several “WIP/Unimplemented” stubs intended to be completed in follow-up PRs.

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[augmentcode]

Review completed. 2 suggestions posted.

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[augmentcode]

Sources/OpenSwiftUICore/View/Text/Text/Text+View.swift:515: ResolvedStyledText.schedule now calls storage.updateSchedule, but NSAttributedString.updateSchedule is currently _openSwiftUIUnimplementedFailure() (also in Sources/OpenSwiftUICore/View/Text/Util/String+Extension.swift:51), so dynamic text can crash at runtime when storage.isDynamic is true.

Severity: high

Other Locations

• Sources/OpenSwiftUICore/View/Text/Util/String+Extension.swift:51

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[augmentcode]

Sources/OpenSwiftUICore/Render/DisplayList/DisplayListViewCache.swift:395: AsyncResult.changed is based only on oldItem.version != newItem.version, which can cause async rendering to skip descending into children even when info.nextUpdate/layer.nextUpdate indicates time-based updates are due.

Severity: medium

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[codecov]

Codecov Report

❌ Patch coverage is 1.78658% with 2034 lines in your changes missing coverage. Please review.
✅ Project coverage is 26.16%. Comparing base (0c73297) to head (18541a3).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...e/Render/DisplayList/DisplayListViewPlatform.swift	0.00%	742 Missing ⚠️
...Core/Render/DisplayList/DisplayListViewModel.swift	0.00%	506 Missing ⚠️
...re/Render/DisplayList/DisplayListViewUpdater.swift	0.00%	477 Missing ⚠️
Sources/OpenSwiftUICore/Shape/MaskLayer.swift	0.00%	77 Missing ⚠️
...enSwiftUICore/Render/DisplayList/DisplayList.swift	39.36%	57 Missing ⚠️
Sources/OpenSwiftUICore/Shape/ShapeLayer.swift	0.00%	50 Missing ⚠️
...Core/Render/DisplayList/DisplayListViewCache.swift	0.00%	44 Missing ⚠️
Sources/OpenSwiftUICore/Shape/Path.swift	0.00%	39 Missing ⚠️
...ore/Render/DisplayList/DisplayListAsyncLayer.swift	0.00%	13 Missing ⚠️
...urces/OpenSwiftUICore/Graphic/GraphicsFilter.swift	0.00%	8 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #858      +/-   ##
==========================================
- Coverage   27.20%   26.16%   -1.05%     
==========================================
  Files         673      677       +4     
  Lines       44165    46059    +1894     
==========================================
+ Hits        12017    12053      +36     
- Misses      32148    34006    +1858     

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