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/set-function-name/index.js

@@ -0,0 +1,23 @@
+'use strict';
+
+var define = require('define-data-property');
+var hasDescriptors = require('has-property-descriptors')();
+var functionsHaveConfigurableNames = require('functions-have-names').functionsHaveConfigurableNames();
+
+var $TypeError = require('es-errors/type');
+
+/** @type {import('.')} */
+module.exports = function setFunctionName(fn, name) {
+	if (typeof fn !== 'function') {
+		throw new $TypeError('`fn` is not a function');
+	}
+	var loose = arguments.length > 2 && !!arguments[2];
+	if (!loose || functionsHaveConfigurableNames) {
+		if (hasDescriptors) {
+			define(/** @type {Parameters<define>[0]} */ (fn), 'name', name, true, true);
+		} else {
+			define(/** @type {Parameters<define>[0]} */ (fn), 'name', name);
+		}
+	}
+	return fn;
+};