Fix invalid @MainActor syntax and add macOS platform compatibility#23

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Copilot wants to merge 7 commits intomainfrom

copilot/fix-main-actor-annotations

Commits on Nov 22, 2025

Add macOS availability attributes and fix NSColor property names

Copilot
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qizh
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Fix color mappings and remove redundant availability annotation

Copilot
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qizh
committed
Fix opaqueSeparator to use correct NSColor property

Copilot
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qizh
committed