Feature request: Change default position on screen

There is currently no way, to my knowledge, to set a default screen position that's not the bottom middle of the screen. I mainly use o
OverKeys on my laptop, so having the keyboard so low hurts my neck. I move it up every time I launch the application, but I wish I could just set it so its always near the top.

For implementation, I suggest either adding x,y sliders or a drop down of positions (top left, top middle, bottom right, etc), or a "set position as default" action in the applet menu (under reset position or something) and as a hotkey, if needed.

Thank you! If I have some time, ill see if can implement it myself and submit it as a PR.

Start by locating the Flutter code that handles the keyboard overlay's current position and the applet menu's reset-position action. Decide which proposed default-position control fits the existing UI, then verify that the chosen position is retained after restarting OverKeys and remains usable near the top of the screen.

Written by the indexing model from the issue text.