fix(libraries): exclude episodes from mixed roots

close #1675

lib/services/jellyfin_client/parts/browse.dart

@@ -428,7 +428,8 @@ mixin _JellyfinBrowseMethods on MediaServerCacheMixin {
   }) async {
     // [libraryKind] is only a fallback for library-default browsing. Explicit
     // grouping types on [query] (seasons/episodes) must keep priority.
-    final effective = (query.kind == null && libraryKind != null && libraryKind != MediaKind.unknown)
+    final effective =
+        (query.kind == null && query.includeKinds.isEmpty && libraryKind != null && libraryKind != MediaKind.unknown)
         ? query.copyWith(kind: libraryKind)
         : query;
     return fetchLibraryContent(libraryId, effective, abort: abort);

lib/services/jellyfin_mappers.dart

@@ -273,6 +273,7 @@ class JellyfinMappers {
       backend: MediaBackend.jellyfin,
       title: view['Name'] as String? ?? t.libraries.fallbackTitle,
       kind: _libraryKindFromCollectionType(collectionType, view['Type'] as String?),
+      defaultBrowseKinds: _defaultBrowseKindsFromCollectionType(collectionType),
       updatedAt: jellyfinIsoToEpochSeconds(view['DateLastSaved'] as String? ?? view['DateModified'] as String?),
       createdAt: jellyfinIsoToEpochSeconds(view['DateCreated'] as String?),
       hidden: false,
@@ -334,6 +335,10 @@ class JellyfinMappers {
     return MediaKind.fromString(type);
   }
 
+  static List<MediaKind> _defaultBrowseKindsFromCollectionType(String? collectionType) {
+    return collectionType?.toLowerCase() == 'mixed' ? const [MediaKind.movie, MediaKind.show] : const <MediaKind>[];
+  }
+
   static Map<String, dynamic>? _userData(Map<String, dynamic> item) {
     final ud = item['UserData'];
     return ud is Map<String, dynamic> ? ud : null;

lib/services/library_query_translator.dart

@@ -52,9 +52,16 @@ class PlexLibraryQueryTranslator implements LibraryQueryTranslator {
   @override
   Map<String, String> toQueryParameters(LibraryQuery query) {
     final filters = <String, String>{};
-    final kindNumber = _plexTypeNumberFor(query.kind);
-    if (kindNumber != null) {
-      filters['type'] = kindNumber.toString();
+    if (query.includeKinds.isNotEmpty) {
+      final kindNumbers = query.includeKinds.map(_plexTypeNumberFor).whereType<int>().join(',');
+      if (kindNumbers.isNotEmpty) {
+        filters['type'] = kindNumbers;
+      }
+    } else {
+      final kindNumber = _plexTypeNumberFor(query.kind);
+      if (kindNumber != null) {
+        filters['type'] = kindNumber.toString();
+      }
     }
     final sort = query.sort;
     if (sort != null) {
@@ -221,7 +228,7 @@ class JellyfinLibraryQueryTranslator implements LibraryQueryTranslator {
       'StartIndex': query.offset.toString(),
       'Limit': query.limit.toString(),
       'EnableTotalRecordCount': 'true',
-      'IncludeItemTypes': _includeTypesFor(query.kind),
+      'IncludeItemTypes': _includeTypesFor(query),
       'Fields': fields,
       ...jellyfinImageQueryParameters,
     };
@@ -263,7 +270,14 @@ class JellyfinLibraryQueryTranslator implements LibraryQueryTranslator {
     return params;
   }
 
-  static String _includeTypesFor(MediaKind? kind) {
+  static String _includeTypesFor(LibraryQuery query) {
+    if (query.includeKinds.isNotEmpty) {
+      return query.includeKinds.map(_includeTypesForKind).join(',');
+    }
+    return _includeTypesForKind(query.kind);
+  }
+
+  static String _includeTypesForKind(MediaKind? kind) {
     return switch (kind) {
       MediaKind.movie => 'Movie',
       MediaKind.show => 'Series',