nits with workspace hard delete

[lxmcgvrn]

from @danbarr

• Nice. One suggestion on the confirmation text, maybe instead of "You will lose any custom instructions, or other configuration.", say "You will lose any custom instructions and prompt history." ? "or other configuration" is a little vague
• Oh minor thing too, I noticed the Archive button is active on the default workspace but if you click it you get an error "Cannot delete default workspace", think that should be "Cannot archive the default workspace"?
• One more nit: the subtext under custom instructions, "augment it's behavior" -> "augment its behavior"