I have some suggestions for new version if you think is useful.
* Update lightgalleryjs - version in theme is 1.9.0, but latest version is 2.7.1. I think it has a lot of new features and is better optimized
* I don't know how much is needed, but maybe make a revision of the code to adapt to PHP version 8
* Colorpicker if need update
This is only a suggestions
I will look into those.
As for PHP 8 I don't know about any issues but for sure I have to do test with PHP 8.2.
With kind regards.