refactored HTTP error handling and streamlined UI components by centralizing shared logic and removing redundant parameters

lib/widget/debug/json_viewer.dart

@@ -4,21 +4,7 @@ import 'package:flutter/material.dart';
 
 import '../../utils/clipboard_helper.dart';
 
-class JsonViewer extends StatelessWidget {
-  final String title;
-  final Map<String, dynamic> data;
-
-  const JsonViewer({super.key, required this.title, required this.data});
-
-  @override
-  Widget build(BuildContext context) => Scaffold(
-    appBar: AppBar(title: Text(title)),
-    body: SingleChildScrollView(
-      scrollDirection: Axis.vertical,
-      child: Text(format(data)),
-    ),
-  );
-
+class JsonViewer {
   static final _encoder = const JsonEncoder.withIndent('  ');
 
   static String format(Map<String, dynamic> jsonInput) =>