As a non-facilitator visiting a board for the first time, I should be prompted for their name.

[zorn]

In order to allow other people to collaborate on a board the expectation is that a facilitator would copy/paste the url of the board and share it with people.

As these people open the page they should be prompted for thier display name. Using this display name and a unique ID (maybe stored in the cookie?) we would let them join the board and visualize their presence in the upper right section of the UI.

Expected user flow:

• Facilitator creates a new board.
• Facilitator copies the URL to the board and shares it with the group, probably via Slack or other chat system.
• As a contributor loads the board URL, the system should look for a known user_id in the session.
• If NOT found the user should be redirected to a board/<id>/join page where the incoming contributor is show the board name, facilitator name and a form allowing them to customize their display name and JOIN the board. The form will POST to an action that creates the user and sets the session user_id and redirects them to the board.
• Once on the board the new contributor's name should be added to the "who's here" list but that work will come in future ticket. For now maybe just render a debug: current user id/name is .