Equalized the center for the focus view and the zoomed in note view

This is a first step towards allowing canvases to slide out,
but keep the zoomed in circle in place by having the focus view
duplicate the circle shape, since the focus view isn't affected
by the sliding canvases, but the zoomed in note view is.
Duplicated the zoomed-in circle shape in focus view
Added basic compatibility between slide focus and zoom animation
Prevent non-dynamic drag to move notes underneath the nav bar
Have note circles to always zoom in to the screen's center

It was zooming in to the canvas' center before, and that doesn't
work well with sliding canvases.
Took top drag handle out of top canvas to allow better zoom animation
Corrected drawer subview heirarchy for zoom focus animation

Also decreased size for top canvas to allow displaying the top drag handle
that is no longer embedded inside the top canvas, but instead, below it.