R1:b64d67f47afc

Frame workboard empty/create states inside profile menu

Summary:
Ref T10054. Uncreated workboards feel a little awkward right now because you lose the menu. Instead, keep the menu.

I also plan to:

- add a "[X] Make the workboard the default view for this project." checkbox; and
- resolve T6961.

...which will touch this workflow, so modernize/straighten it out.

Test Plan:
Viewed workboard, no access state, empty state. Created empty board, imported board.

{F1066973}

Reviewers: chad

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