Prompt coders to log in when they do significant work logged out

While it’s fine to use Popcode logged out for quickly practicing coding techniques, we don’t want students doing a significant amount of work without it being saved. The always-visible “log in to save” prompt in the top bar is definitely an improvement, but I think we can be a bit more annoying about it.

In particular, I would propose a banner notification when the student has done a significant amount of work logged out. “A significant amount of work” might be measured in time since they started working, or number of discrete changes to the current project, or some combination of the two.

At such time as the wire is tripped for “a significant amount of work has been done”, we’ll want to display a banner notification (probably using a not-yet-existing “warning” yellow) that informs the user that their work won’t be saved and prompts them to log in. I think this idea is entirely stolen from CodePen.

I think it’s probably best to only display this notification once per session.