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/loader-utils/lib/getOptions.js

@@ -0,0 +1,20 @@
+'use strict';
+
+const parseQuery = require('./parseQuery');
+
+function getOptions(loaderContext) {
+  const query = loaderContext.query;
+
+  if (typeof query === 'string' && query !== '') {
+    return parseQuery(loaderContext.query);
+  }
+
+  if (!query || typeof query !== 'object') {
+    // Not object-like queries are not supported.
+    return {};
+  }
+
+  return query;
+}
+
+module.exports = getOptions;