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/call-bind/index.js

@@ -0,0 +1,24 @@
+'use strict';
+
+var setFunctionLength = require('set-function-length');
+
+var $defineProperty = require('es-define-property');
+
+var callBindBasic = require('call-bind-apply-helpers');
+var applyBind = require('call-bind-apply-helpers/applyBind');
+
+module.exports = function callBind(originalFunction) {
+	var func = callBindBasic(arguments);
+	var adjustedLength = originalFunction.length - (arguments.length - 1);
+	return setFunctionLength(
+		func,
+		1 + (adjustedLength > 0 ? adjustedLength : 0),
+		true
+	);
+};
+
+if ($defineProperty) {
+	$defineProperty(module.exports, 'apply', { value: applyBind });
+} else {
+	module.exports.apply = applyBind;
+}