Command modals

[ammario]

/compact and /fork are both quite important but not discoverable via the UI at the moment. I propose we can where delete workspace is right now:

and convert that into a kebab menu with multiple actions:

• Compact
• Fork
• Delete

I like how the New Workspace modal gives an equivalent command as user education:

I think we should do the same for fork and compact.

Also, we handle syntax errors in a /new attempt by opening a modal with the partially parsed values, I think a similar flow would be nice for compact and fork.