✨ Auto complete, better metion parser, sticker placeholder v2

lib/models/autocomplete_response.dart

@@ -0,0 +1,16 @@
+import 'package:freezed_annotation/freezed_annotation.dart';
+
+part 'autocomplete_response.freezed.dart';
+part 'autocomplete_response.g.dart';
+
+@freezed
+sealed class AutocompleteSuggestion with _$AutocompleteSuggestion {
+  const factory AutocompleteSuggestion({
+    required String type,
+    required String keyword,
+    required dynamic data,
+  }) = _AutocompleteSuggestion;
+
+  factory AutocompleteSuggestion.fromJson(Map<String, dynamic> json) =>
+      _$AutocompleteSuggestionFromJson(json);
+}