feat: add default key

+import 'dart:convert';
+
+import 'package:crypto/crypto.dart';
 import 'package:flutter/widgets.dart';
 
 import '../config/manager.dart';
@@ -30,7 +33,7 @@ class ClickInfo {
     if (key != null && key is ValueKey) {
       clickInfo._elementManualKey = (key).value;
     } else {
-      clickInfo._elementManualKey = key?.toString() ?? '';
+      clickInfo._elementManualKey = key?.toString() ?? md5.convert(utf8.encode('${clickInfo._elementType}${clickInfo._elementPath}')).toString();
     }
     clickInfo._ignore = AutoTrackConfigManager.instance.isIgnoreElement(key);
     if (key is AutoTrackElementKey && !clickInfo._ignore) {

+import 'dart:convert';
+
+import 'package:crypto/crypto.dart';
 import 'package:flutter/material.dart';
 
 import '../config/config.dart';
@@ -12,8 +15,8 @@ class PageInfo {
     PageInfo pageInfo = PageInfo._(PageTimer());
     pageInfo._pageKey = element.widget.runtimeType.toString();
     pageInfo._pagePath = pageConfig.pagePath ?? route.settings.name ?? '';
-    pageInfo._pageManualKey = pageConfig.pageID ?? '';
     pageInfo._pageTitle = pageConfig.pageTitle ?? pageInfo._findTitle(element) ?? '';
+    pageInfo._pageManualKey = pageConfig.pageID ?? md5.convert(utf8.encode('${pageInfo._pageKey}${pageInfo._pagePath}${pageInfo._pageTitle}')).toString();
     pageInfo.ignore = pageConfig.ignore;
     return pageInfo;
   }