Tooltip now has cursor default and won't hide the input when clicked. Al...

...so added o-color use cases
Is it likely that the tooltip will share the same colour scheme as big overlays?  The provisional designs you have do not have a light on dark theme.  I'd suggest adding a 'tooltip' use case ahead of 'overlay', because I suspect you'll want to redefine the overlay colour use cases later when you do the overlays work