refactor container selection pattern and improve search UI

app/lib/features/sync/domain/repositories/sync.dart

@@ -1,11 +1,11 @@
 import 'dart:async';
 
 import 'package:collection/collection.dart';
-import 'package:drift/drift.dart';
 import 'package:flutter_mozilla_components/flutter_mozilla_components.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:riverpod_annotation/riverpod_annotation.dart';
 import 'package:weblibre/core/logger.dart';
+import 'package:weblibre/features/geckoview/domain/entities/tab_container_selection.dart';
 import 'package:weblibre/features/geckoview/domain/repositories/tab.dart';
 import 'package:weblibre/features/geckoview/features/tabs/domain/repositories/container.dart';
 import 'package:weblibre/features/sync/domain/entities/sync_repository_state.dart';
@@ -282,7 +282,9 @@ class SyncRepository extends _$SyncRepository {
           url: uri,
           selectTab: true,
           private: false,
-          container: Value(assignedContainer),
+          containerSelection: assignedContainer == null
+              ? const TabContainerSelection.unassigned()
+              : TabContainerSelection.specific(assignedContainer),
         );
   }