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/whatwg-url/index.js

@@ -0,0 +1,24 @@
+"use strict";
+
+const { URL, URLSearchParams } = require("./webidl2js-wrapper");
+const urlStateMachine = require("./dist/url-state-machine");
+const percentEncoding = require("./dist/percent-encoding");
+
+const sharedGlobalObject = {};
+URL.install(sharedGlobalObject, ["Window"]);
+URLSearchParams.install(sharedGlobalObject, ["Window"]);
+
+exports.URL = sharedGlobalObject.URL;
+exports.URLSearchParams = sharedGlobalObject.URLSearchParams;
+
+exports.parseURL = urlStateMachine.parseURL;
+exports.basicURLParse = urlStateMachine.basicURLParse;
+exports.serializeURL = urlStateMachine.serializeURL;
+exports.serializeHost = urlStateMachine.serializeHost;
+exports.serializeInteger = urlStateMachine.serializeInteger;
+exports.serializeURLOrigin = urlStateMachine.serializeURLOrigin;
+exports.setTheUsername = urlStateMachine.setTheUsername;
+exports.setThePassword = urlStateMachine.setThePassword;
+exports.cannotHaveAUsernamePasswordPort = urlStateMachine.cannotHaveAUsernamePasswordPort;
+
+exports.percentDecode = percentEncoding.percentDecodeBytes;