Updating landscape layout for launcher/quickstep

> Hotseat is tied to navbar (on left in seascape)
> Search box shows up in Overview (clicking it would crash for now)
> All-apps is no longer fullscreen in landscape
> Recents cards are appropriately scaled down
> Hotseat is visible in Overview

Bug: 70179916
Change-Id: I53149eaeac9557e8a01021b7e2d139f3d6ceef37