[Redesign] First rough pass at new ObjectBoxView

Summary: Ref T8099. These are still in progress, but helps visualize the major UI changes before getting deep into the details.

Test Plan:
Visit basic dashboard, task, diff, and edit pages.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8099

Differential Revision: https://secure.phabricator.com/D12757