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/data-view-buffer/index.js

@@ -0,0 +1,19 @@
+'use strict';
+
+var $TypeError = require('es-errors/type');
+
+var callBound = require('call-bound');
+
+var $dataViewBuffer = callBound('DataView.prototype.buffer', true);
+
+var isDataView = require('is-data-view');
+
+// node <= 0.10, < 0.11.4 has a nonconfigurable own property instead of a prototype getter
+/** @type {import('.')} */
+module.exports = $dataViewBuffer || function dataViewBuffer(x) {
+	if (!isDataView(x)) {
+		throw new $TypeError('not a DataView');
+	}
+
+	return x.buffer;
+};