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/callBound.js

@@ -0,0 +1,15 @@
+'use strict';
+
+var GetIntrinsic = require('get-intrinsic');
+
+var callBind = require('./');
+
+var $indexOf = callBind(GetIntrinsic('String.prototype.indexOf'));
+
+module.exports = function callBoundIntrinsic(name, allowMissing) {
+	var intrinsic = GetIntrinsic(name, !!allowMissing);
+	if (typeof intrinsic === 'function' && $indexOf(name, '.prototype.') > -1) {
+		return callBind(intrinsic);
+	}
+	return intrinsic;
+};