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/core-js-pure/modules/es.object.get-own-property-names.js

@@ -0,0 +1,13 @@
+'use strict';
+var $ = require('../internals/export');
+var fails = require('../internals/fails');
+var getOwnPropertyNames = require('../internals/object-get-own-property-names-external').f;
+
+// eslint-disable-next-line es/no-object-getownpropertynames -- required for testing
+var FAILS_ON_PRIMITIVES = fails(function () { return !Object.getOwnPropertyNames(1); });
+
+// `Object.getOwnPropertyNames` method
+// https://tc39.es/ecma262/#sec-object.getownpropertynames
+$({ target: 'Object', stat: true, forced: FAILS_ON_PRIMITIVES }, {
+  getOwnPropertyNames: getOwnPropertyNames
+});