Reintroduce StatusNotifierModel-based system tray icons, gated on
convergenceModeEnabled. Desktop apps (KDE Connect, nm-applet, etc.)
expose tray icons that were removed in 1914e9be as unusable on
phone screens.
The status bar wrapper is raised above the ActionDrawerOpenSurface
so tray icon MouseAreas receive click events while non-interactive
areas still fall through to the swipe handler.
TaskWidget.qml supports left-click (Activate), right-click
(ContextMenu), hover tooltip, and hides Passive/ApplicationStatus
items. The lockscreen SIGABRT guard (disableSystemTray) is restored
on the action drawer's StatusBar instance.
The system tray has not been useful on mobile and isn't particularly
interactable due to its small size. Remove the system tray from the
status bar, if we need its functionality it would be more appropriate to
create a larger "tray UI" in the quicksettings area
This converts many of the animation durations to Kirigami units so that
they can be controlled system wide. It also speeds up several of the
animation durations (ex. in folio) from 800ms to 400ms to improve the
feel and responsiveness of the shell.
Move from a C++ library + QML plugin to a QML plugin only for simplicity, since the homescreen switching architecture will be done from Plasma, and so use of the shell library only needs to be from QML.
