Fix NSHostingView dealloc issue

[Mx-Iris]

Close #454

[Copilot]

Pull Request Overview

This PR fixes an NSHostingView deallocation issue on macOS by properly closing windows and ensuring proper cleanup behavior in tests. The changes address issue #454 where NSHostingView was not being deallocated correctly, which was causing inconsistent test results between macOS and other platforms.

• Removes macOS-specific conditional compilation that was working around the deallocation issue
• Adds proper window cleanup by setting isReleasedWhenClosed = false and explicitly calling close() on macOS
• Updates test expectations to be consistent across all platforms

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
AppearanceActionModifierCompatibilityTests.swift	Removes macOS-specific workaround and unifies test expectations across platforms
PlatformHostingControllerHelper.swift	Adds proper window cleanup logic for macOS to ensure NSHostingView deallocation

[Copilot]

The await keyword is used with #expect which is not an async function. This will cause a compilation error. Remove the await keyword.

Suggested change

	await #expect(Helper.result == "AADD")
	#expect(Helper.result == "AADD")

[Copilot]

The @MainActor attribute was removed from this test struct. According to the coding guidelines, test structures should maintain proper isolation when dealing with UI components. Since this test involves appearance actions which typically require main actor isolation, consider whether this removal is intentional or if it might cause concurrency issues.