[Inbox] Simplify code, fix typings, and fix conversation linking
[Inbox] Simplify code, fix typings, and fix conversation linking

artsy/eigen,artsy/emission,artsy/eigen,artsy/emission,artsy/eigen,artsy/emission,artsy/emission,artsy/eigen,artsy/eigen,artsy/emission,artsy/emission,artsy/eigen,artsy/eigen,artsy/emission