[Error Handling] Audit and patch any error handling holes WRT client-server interaction

[kofi-q]

We'll need to make sure we're handling server errors gracefully in the client and not just crashing the app - surface whatever messaging might helpful to the user/tell them to refresh. ask for support, etc.

[arsalansufi]

Jotting down some examples of error cases that surface a "Something went wrong":

• A contest is too large to fit on a page at the current ballot size
• A precinct has no contests associated with it