improved performance and battery usage on older devices

lib/view/pages/timetable/timetable.dart

@@ -266,11 +266,12 @@ class _ViewingBanner extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
-    final isFavorite = context
-        .watch<SettingsCubit>()
-        .val()
-        .timetableFavoritesSettings
-        .isFavorite(element.type, element.id);
+    final isFavorite = context.select(
+      (SettingsCubit c) => c.state.timetableFavoritesSettings.isFavorite(
+        element.type,
+        element.id,
+      ),
+    );
 
     final onColor = theme.colorScheme.onSecondaryContainer;
     // Compact icon button: ~32px square, no extra padding, so the banner stays