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/@babel/helper-module-transforms/lib/rewrite-this.js

@@ -0,0 +1,22 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = rewriteThis;
+var _core = require("@babel/core");
+var _traverse = require("@babel/traverse");
+let rewriteThisVisitor;
+function rewriteThis(programPath) {
+  if (!rewriteThisVisitor) {
+    rewriteThisVisitor = _traverse.visitors.environmentVisitor({
+      ThisExpression(path) {
+        path.replaceWith(_core.types.unaryExpression("void", _core.types.numericLiteral(0), true));
+      }
+    });
+    rewriteThisVisitor.noScope = true;
+  }
+  (0, _traverse.default)(programPath.node, rewriteThisVisitor);
+}
+
+//# sourceMappingURL=rewrite-this.js.map