Fix RemovePlaylist to use new 4-field config format

- Include JellyfinId when serializing playlists after removal
- Ensures config format stays consistent: [Name,SpotifyId,JellyfinId,position]
- Fixes issue where removed playlists would stay in the list

allstarr/Controllers/AdminController.cs

@@ -461,9 +461,9 @@ public class AdminController : ControllerBase
         
         currentPlaylists.Remove(playlist);
         
-        // Convert to JSON format for env var
+        // Convert to JSON format for env var: [["Name","SpotifyId","JellyfinId","first|last"],...]
         var playlistsJson = JsonSerializer.Serialize(
-            currentPlaylists.Select(p => new[] { p.Name, p.Id, p.LocalTracksPosition.ToString().ToLower() }).ToArray()
+            currentPlaylists.Select(p => new[] { p.Name, p.Id, p.JellyfinId, p.LocalTracksPosition.ToString().ToLower() }).ToArray()
         );
         
         // Update .env file