tab trees

app/lib/features/geckoview/domain/entities/states/tab.dart

@@ -16,6 +16,8 @@ class TabState extends WebPageInfo {
   @CopyWithField(immutable: true)
   final String id;
 
+  final String? parentId;
+
   final String? contextId;
 
   @override
@@ -47,6 +49,7 @@ class TabState extends WebPageInfo {
 
   TabState({
     required this.id,
+    required this.parentId,
     required this.contextId,
     required super.url,
     required String title,
@@ -64,6 +67,7 @@ class TabState extends WebPageInfo {
 
   factory TabState.$default(String tabId) => TabState(
     id: tabId,
+    parentId: null,
     contextId: null,
     url: Uri.parse('about:blank'),
     title: "",
@@ -83,6 +87,7 @@ class TabState extends WebPageInfo {
   List<Object?> get hashParameters => [
     ...super.hashParameters,
     id,
+    parentId,
     contextId,
     icon,
     thumbnail,