[CHANGE] UI of the task editor

[chibigly]

As the task editor has very much empty space left, maybe consider making it one of these pop-up/swipe-down-things (idk what they are called properly):

This would - visually at least - reduce the app to even less separate pages: one.
It would also drag your neat QR code down to the bottom of the screen (well, at least above the keyboard when typing), which is nearer to the finger tips, easier to tap - all of the elements would be, in this case.