Allow custom folder colors for macOS

[tophermckee]

macOS 26 introduced the option for custom folder colors (maybe it was already there?). Is it possible for this tool to support that?

[firu11]

You can already change the folder color by clicking on it or choosing one the "Variant" option.

Although the new MacOS 26 has a slightly more vibrant colors, so the ones made on FolderArt do not match anymore.