Send had a large empty region under the form doing nothing, and Receive had
nothing at all. Both get the scene back — but as real layout items, not as the
overlay that painted over the forms last time.
Send: the form only ever needed the top of the tab, so the QFormLayout is now
wrapped in a vbox and the scene takes the rest. The widget's vertical size
policy was Maximum, which made it hug the form; it owns the whole tab now. The
form itself is untouched, and nothing is drawn on top of the address or amount
fields.
Receive: a short banner under the address table.
Built and smoke-tested from the AppImage lane.
jwinterm