R1:f5a7e8bdbd9a

[Redesign] Phriction UI Updates, Header tweaks

Summary: Ref T8099, walked through Phriction, updated PHUIHeader for more consistent layouts.

Test Plan: Test Phriction Document, Heirarchy, History, Diffs.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8099

Differential Revision: https://secure.phabricator.com/D13084