Fix setTimeout

lib/foundation/js_engine.dart

@@ -172,6 +172,12 @@ class JsEngine with _JSEngineApi {
             {
               return ComicSource.find(message["key"])!.isLogged;
             }
+            // temporary solution for [setTimeout] function
+            // TODO: implement [setTimeout] in quickjs project
+          case "delay":
+            {
+              return Future.delayed(Duration(milliseconds: message["time"]));
+            }
         }
       }
       return null;

lib/pages/comic_source_page.dart

@@ -8,6 +8,7 @@ import 'package:venera/foundation/comic_source/comic_source.dart';
 import 'package:venera/foundation/log.dart';
 import 'package:venera/network/app_dio.dart';
 import 'package:venera/utils/ext.dart';
+import 'package:venera/utils/image.dart';
 import 'package:venera/utils/io.dart';
 import 'package:venera/utils/translations.dart';
 
@@ -705,10 +706,14 @@ class _CallbackSettingState extends State<_CallbackSetting> {
       setState(() {
         isLoading = true;
       });
-      await result;
-      setState(() {
-        isLoading = false;
-      });
+      try {
+        await result;
+      }
+      finally {
+        setState(() {
+          isLoading = false;
+        });
+      }
     }
   }