batches: fix warnings reported by ARC Toolkit
Created by: courier-new
This PR is a large collection of mostly-disjoint fixes to warnings and issues reported by running the ARC Toolkit checks on the SSBC workflow screens, and then a couple other fixes.
Test plan
Manually verifying each fix. Tried my best to look out for visual regressions, but Percy/Chromatic should pick up any big ones on the main screens.
App preview:
Check out the client app preview documentation to learn more.