feat: Elevator Happy Path

[cmaddox5]

Created the new Elevator screen widget with a hardcoded "happy path". At the moment, it only sends the configured ID, current time, and empty lists of alerts. I used these designs to guide the implementation.

https://screens-dev-green.mbtace.com/v2/screen/ELE-101

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[digitalcora]

This approach seems fine to me — though I do wonder if we should be pre-emptively splitting the distinct "parts" we've already identified here (header, content, footer) into separate widgets on the backend, so e.g. we could have a piece of evergreen content replace only the main content area, and not have to add "hard-coded" copies of the header and footer to make it look right. Up to you, I think it would be a similar effort to do that now or do it later.

[cmaddox5]

That's a good point. I didn't think about evergreen enough when building this out. I'll go ahead and do that now so we have a finalized layout before starting the harder work later.