Automatically pin "Already Added" playlists to the top of the "Add to Playlist" screen.

Description: Prevent duplicate tracks by instantly showing which playlists already contain a song at the very top of the selection menu.

Details: Currently, it’s hard to tell if a song is already in your library without scrolling. I suggest that whenever a user hits "Add to Playlist," any list that already contains that song should be pinned to the very top. This gives power users an immediate visual confirmation so they don't accidentally create duplicates. It’s a small UI change that would make library management much faster and "cleaner" for those of us with large, curated collections.