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Or the copyrighted Launchpad, Activity Monitor, App Store, Music, and Safari icons in the screenshot.

Pretty easy to avoid copyright by making your own icons then you are left with trademark.

I'm honestly at that point not sure if there is an issue you aren't offering a confusingly similar product. Mac isn't offering an icon pack they merely have one. At least they don't appear to have ever gone after Macish icon themes legally.

Apple regularly cease and desists unauthorized parties using their icons and other likenesses over the years. I’m not aware of an instance where one of those recipients have refused and went to court with Apple.

The difference is whether the sidebar ends below the tile bar, or goes through the title bar.

It's so subtle it almost seems like parody.

Default the sidebar is full height

Yeah, Apple will likely have this taken down. They have done so to similar "look and feel" projects in the past.