The popup showing details of a certain list-item had the down-side that
the list item we selected was made darker with the rest of the screen,
making it harder to understand the whole info.
This change repeats the clicked item inside the popup in a way that
makes it immediately clear which transaction we are showing details of.
In Qt5 the palette was introduced in the Control object (part of Qt-
Quick-Controls-2).
In Qt6 this property was moved to the superclass 'Item'.
This means that we no longer need to refer to a control when using a
palette, every single thing in QtQuick is an Item, afterall.
This gives the dark-theme a make-over with better colors, more colors
coming from the palette and this makes the conceptual usage between the
mobile and desktop clients of colors to be in-line.
tomFlowee