You can download the full source, create you own version and compile your own. Ut why not simply add CUA mode in your init file?

I am not a big fan of email marketing - I get enough spam. Also don’t want popups on my website.

My website helps doing just that: https://lucidmanager.org/tags/emacs

Try consult-find to search for files using grep.

What type of source block is it? Did you configure org-babel?