Create issues for new addons UI

[humitos]

We talked a lot about what are the next steps for addons at the offsite.

We should create the issues we want to work on with some description and related mockups, etc.

Here is the document we wrote about Addons UI: https://docs.google.com/document/d/1efWUL7rdGwOsBUZjycSCB_iFK2PkWNszgrgBjWujO44/edit?tab=t.0#heading=h.jjiwnwrn8gnl

[humitos]

Done in #574