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/webpack/lib/wasm-sync/UnsupportedWebAssemblyFeatureError.js

@@ -0,0 +1,16 @@
+/*
+	MIT License http://www.opensource.org/licenses/mit-license.php
+*/
+
+"use strict";
+
+const WebpackError = require("../WebpackError");
+
+module.exports = class UnsupportedWebAssemblyFeatureError extends WebpackError {
+	/** @param {string} message Error message */
+	constructor(message) {
+		super(message);
+		this.name = "UnsupportedWebAssemblyFeatureError";
+		this.hideStack = true;
+	}
+};