[Redesign] Misc cleanup

Summary: Ref T8099, random bug fixes in headers, PHUIDocumentView, soften Oswald colors.

Test Plan: browse and test each change.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8099

Differential Revision: https://secure.phabricator.com/D13147