Initial commit: Developer Tools MVP with visual editor

- Complete React app with 7 developer tools
- JSON Tool with visual structured editor
- Serialize Tool with visual structured editor
- URL, Base64, CSV/JSON, Beautifier, Diff tools
- Responsive navigation with dropdown menu
- Dark/light mode toggle
- Mobile-responsive design with sticky header
- All tools working with copy/paste functionality

node_modules/react-dev-utils/refreshOverlayInterop.js

@@ -0,0 +1,19 @@
+// @remove-on-eject-begin
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+// @remove-on-eject-end
+'use strict';
+
+const {
+  dismissRuntimeErrors,
+  reportRuntimeError,
+} = require('react-error-overlay');
+
+module.exports = {
+  clearRuntimeErrors: dismissRuntimeErrors,
+  handleRuntimeError: reportRuntimeError,
+};