R1:af9d6f593e1b

Show signature status on Legalpad main view

Summary: Ref T3116. Tweak the main Legalpad view a bit -- in particular, show signature status.

Test Plan: {F171641}

Reviewers: chad

Reviewed By: chad

Subscribers: epriestley

Maniphest Tasks: T3116

Differential Revision: https://secure.phabricator.com/D9768