Update focused (active) and editing states

[ulian-onua]

@mirkokiefer @memstel

The changes in this PR are:

1. The selection view area border around the text is updated: the width and color are updated.
2. Fix an issue when left and right knobs positions were calculated incorrectly
3. Update cursor to move text annotation

We discussed with @mirkokiefer on Slack to not change the scale knob position from the bottom to the top as it is described on Basecamp.

Note: the text resizing issues are not fixed in this PR and will be fixed in another PR