TF-138 Add presentation layer for search mail with text pattern

lib/features/thread/presentation/model/search_state.dart

@@ -0,0 +1,24 @@
+
+import 'package:equatable/equatable.dart';
+import 'package:tmail_ui_user/features/thread/presentation/model/search_status.dart';
+
+class SearchState with EquatableMixin {
+  final SearchStatus searchStatus;
+
+  SearchState(this.searchStatus);
+
+  factory SearchState.initial() {
+    return SearchState(SearchStatus.INACTIVE);
+  }
+
+  SearchState disableSearchState() {
+    return SearchState(SearchStatus.INACTIVE);
+  }
+
+  SearchState enableSearchState() {
+    return SearchState(SearchStatus.ACTIVE);
+  }
+
+  @override
+  List<Object?> get props => [searchStatus];
+}

lib/features/thread/presentation/model/search_status.dart

@@ -0,0 +1,4 @@
+
+enum SearchStatus {
+  ACTIVE, INACTIVE
+}