Finalize the Workspaces UI

It looks like the link to the original designs is locked. Any chance we could take a look to it to inform 📌 Integrate Navigation with Workspaces Needs work ?

Bump on the permissions problem for the prototype.

I also don't have access to that prototype, but, until it can be sorted out, there are a few screenshots in 📌 UX: Elevate the Workspace UI around the site canvas Needs work and a gif animation in #2732081-8: WI: Phase G2: Full-site preview with Workspace UI → , which demonstrate a large portion of the design concept for Workspaces UI.

There's also a recording of a UX meeting where that design was discussed: https://www.youtube.com/watch?v=hf8AovBZflo

I've added 📌 Improve UX of Workspace management UI Active to help with some improvements downstream from user testing of workspaces.

I've managed to unlock the prototype, you should be able to access it now