fix(libraries): exclude episodes from mixed roots

close #1675

test/services/jellyfin_client_urls_test.dart

@@ -2342,6 +2342,8 @@ void main() {
       expect(albumBrowse['Fields'], 'PremiereDate,OriginalTitle,SortName');
       expect(albumBrowse['EnableUserData'], 'false');
       expect(trackBrowse['Fields'], 'UserData,PremiereDate,OriginalTitle,SortName');
+      expect(albumBrowse['IncludeItemTypes'], 'MusicAlbum');
+      expect(trackBrowse['IncludeItemTypes'], 'Audio');
       expect(trackBrowse.containsKey('EnableUserData'), isFalse);
       expect(artistAlbums['Fields'], 'PremiereDate,OriginalTitle,SortName');
       expect(artistAlbums['EnableUserData'], 'false');

test/services/jellyfin_mappers_test.dart

@@ -474,13 +474,22 @@ void main() {
       }
     });
 
-    test('falls back to MediaKind.unknown for unrecognised collections', () {
-      final lib = JellyfinMappers.library({
-        'Id': 'view-x',
+    test('maps mixed collections to a movie and show root browse', () {
+      final mixed = JellyfinMappers.library({
+        'Id': 'view-mixed',
         'Name': 'Mixed',
         'CollectionType': 'mixed',
       }, serverId: ServerId(_serverId))!;
-      expect(lib.kind, MediaKind.unknown);
+      expect(mixed.kind, MediaKind.unknown);
+      expect(mixed.defaultBrowseKinds, const [MediaKind.movie, MediaKind.show]);
+
+      final unrecognised = JellyfinMappers.library({
+        'Id': 'view-books',
+        'Name': 'Books',
+        'CollectionType': 'books',
+      }, serverId: ServerId(_serverId))!;
+      expect(unrecognised.kind, MediaKind.unknown);
+      expect(unrecognised.defaultBrowseKinds, isEmpty);
     });
   });
 

test/services/library_query_translator_test.dart

@@ -21,6 +21,11 @@ void main() {
       expect(params['type'], '2');
     });
 
+    test('multiple kinds map to a comma-delimited type filter', () {
+      final params = translator.toQueryParameters(const LibraryQuery(includeKinds: [MediaKind.movie, MediaKind.show]));
+      expect(params['type'], '1,2');
+    });
+
     test('collection kind has no Plex type number (filtered separately)', () {
       final params = translator.toQueryParameters(const LibraryQuery(kind: MediaKind.collection));
       expect(params, isNot(contains('type')));
@@ -98,6 +103,13 @@ void main() {
       expect(params['IncludeItemTypes'], 'Series');
     });
 
+    test('multiple kinds map to combined IncludeItemTypes', () {
+      final params = translator.toQueryParameters(
+        const LibraryQuery(kind: MediaKind.episode, includeKinds: [MediaKind.movie, MediaKind.show]),
+      );
+      expect(params['IncludeItemTypes'], 'Movie,Series');
+    });
+
     test('collection kind maps to IncludeItemTypes=BoxSet', () {
       final params = translator.toQueryParameters(const LibraryQuery(kind: MediaKind.collection));
       expect(params['IncludeItemTypes'], 'BoxSet');