Theme directory: Preview style variations

[poena]

Both Twenty Twenty-Two and Twenty Twenty-Three uses global style variations that can be selected in the Site Editor.
The style variations are additional .json files with global styles settings and styles, placed in the themes styles folder.

When you browse themes, there is no way to preview these style variations.
On the theme information page, the style variations could have a small preview similar to the one in the site editor, where you can see the name of the variation, font choices and colors.
On the demo page, there could be a style variation selector in the sidebar, similar to the one in the site editor.

[joyously]

This is not unique to block themes. Most themes have options that can't be seen in the preview.
The preview site could have a demo Customizer with disabled Publish or just customize_changesets that the theme author supplies for the visitor to see.

[poena]

@dufresnesteven I think this ticket should be closed, because I found an older one *laugh*
https://meta.trac.wordpress.org/ticket/6059

[dufresnesteven]

Fair enough, I have a big comment I was about to drop :). I'll move it over.

[dufresnesteven]

Duplicate of #6059.