Exend dash hover states to the bottom screen edge
In previous versions of the shell, we made sure to make use of the screen edge for the dash:
This allowed tracking along the screen edge to target an icon.
In the latest overview rework, this is no longer possible: if you place the pointer along the bottom screen edge below an app launcher, it doesn't highlight and clicking has no effect. The fact that the bottom screen edge is a more effective affordence than the left makes this a particular shame.
For this to work, we need to both extend the active area of the app launchers, and reduce the distance between the launchers and the screen edge. I would do the latter by foremost reducing the distance between the dash and the screen edge: