Sorting of watchlist entries is broken
Inside of watchlists, watchlist entries are supposed to be draggable so that their position can be changed, see the info in the corresponding helpdesk:
By dragging the dark blue area of a medium, you can change the order as you wish.
But this does not work any longer. In the browser console you can see
watchlists.coffee:7 Uncaught TypeError: $(...).sortable is not a function
at HTMLDocument.<anonymous> (watchlists.coffee:7:36)
It is broken in production and next.
Also make sure that https://github.com/MaMpf-HD/mampf/pull/842#discussion_r2292233940 is working as expected.
In the solution, please also make sure that the approach can be used elsewhere as well with minimal overhead, since we need this dragging around for Vignettes as well (not sure, but I think we used Sortable there too). In the end, the respective watchlist JS files should probably import sortable on-top of their files as node_module. It should not be the case that the Sortable JS code is imported on pages where it is not needed. As usual, follow best practices from the respective package documentations.