Straighten out some crumbs and links for workboards

Summary: Ref T1344. Minor tweaks for crumb/link stuff -- @mikn has been doing some work here recently and I want to unblock him.

Test Plan: Viewed board; viewed column edit screen.

Reviewers: chad, btrahan

Reviewed By: chad

CC: mikn, aran

Maniphest Tasks: T1344

Differential Revision: https://secure.phabricator.com/D7937