Quicksand + Pholio - make mock view work

Summary: Ref T8036. This was a lot of JS to fiddle with.

Test Plan: viewed a mock with durable column open, clicked back to pholio home, then clicked back to mock and was able to switch images. clicked to profile and then hit browser back and was still able to switch images.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T8036

Differential Revision: https://secure.phabricator.com/D12727