Text cannot be copied with the copy button.

Looks like a browser configuration to me. I was able to copy in my Firefox, but I get the above error in Chrome.

Hello Michael,

do you have custom CSP rules, or if you use Drupal Security Kit, please add the wildcard URL https://*.ai-sidekick.app to the frame-src field.

Does that solve your issue?

Hmm this would be a patch for this module, but you added the attribute already.
Might be a browser issue as well, but I'm using the same browser in different tabs the stage (OK) and the localdev (Not OK)

Fyi: https://web.dev/async-clipboard/#permissions-policy-integration

I think this is a DDEV / local system problem.
I tested it with a custom docker setup without DDEV and it worked.