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/jsx-ast-utils/lib/values/expressions/SpreadElement.js

@@ -0,0 +1,17 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = extractValueFromSpreadElement;
+/**
+ * Extractor function for a SpreadElement type value node.
+ * We can't statically evaluate an array spread, so just return
+ * undefined.
+ *
+ * @param - value - AST Value object with type `SpreadElement`
+ * @returns - An prototypeless object.
+ */
+function extractValueFromSpreadElement() {
+  return undefined;
+}