It works similarly as in the timeline with a bottom based drawer on
mobile and a normal context menu on desktop
Signed-off-by: Carl Schwan <carl@carlschwan.eu>
"Open in new Window" goes on top, as it does in most other context menus
with similar items
"Leave room" goes on the bottom with a separator above it, because it's
a mildly destructive action.
This ports the room list delegates to Kirigami.BasicListItem leading/trailing for a more consistent appearance with other applications, and adjusts how their context menus look and behave