fix: pre-roll/feature pre-roll bumpers not found in library (v1.0.0.8)

TopParentIds-based queries could fail to match Movie items in the
configured pre-roll library even when they appear correctly in the
Jellyfin UI. Look up the library Folder by ID and walk its recursive
children directly instead, matching the path-based approach already
used for the trailer pool.

Jellyfin.Plugin.CinemaTrailers4Jellyfins/Services/TrailerIntroProvider.cs

@@ -193,13 +193,16 @@ namespace Jellyfin.Plugin.CinemaTrailers4Jellyfins.Services
                 return null;
             }
 
-            var movies = _libraryManager
-                .GetItemList(new InternalItemsQuery
-                {
-                    IncludeItemTypes = new[] { BaseItemKind.Movie },
-                    TopParentIds = new[] { parsedId },
-                    Recursive = true,
-                })
+            if (_libraryManager.GetItemById(parsedId) is not Folder folder)
+            {
+                _logger.LogWarning(
+                    "|CinemaTrailers4Jellyfins| {Label} library {LibraryId} could not be found.",
+                    label,
+                    parsedId);
+                return null;
+            }
+
+            var movies = folder.GetRecursiveChildren()
                 .OfType<Movie>()
                 .Where(m => m.Id != excludeId)
                 .ToList();