Implements the rest of https://invent.kde.org/plasma/plasma-mobile/-/issues/219
There was a typo with the padding to use in the calculation for the y position of the folder, it should use the top padding not the right padding.
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.
Use plasma_add_applet to deploy as a module: https://invent.kde.org/plasma/libplasma/-/merge_requests/1116
