Flatten recents (remove curve effect)

- Workspace card scales down to be same width as other cards, which
  leaves a gap at the bottom due to difference in aspect ratio. This
  can be changed in the future, but deferring for now.
- Workspace card no longer offsets when scrolling.
- Cards no longer scale and translate, but still have a bit of dimming
  when on the edges, so the center card has the most focus.

A lot of code can be cleaned up. Added TODO's now, will cleanup in
followup CL

Bug: 70179222
Change-Id: I2332aab10e2549a455f773e053ed8b48677c3110