Review all controllers for offline use

We should verify what happens to controllers when connectivity goes down and make sure they can resume peacefully. Is this something we handle higher up int he stack, like at the app level?

The issue names no files, tests, or controller entry points. Start by identifying all controllers and checking how the app currently handles connectivity loss; clarify whether offline recovery belongs in controllers or at the app level before defining what completion means.

Written by the indexing model from the issue text.