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/identity-obj-proxy/src/__tests__/require-es6-import-test.js

@@ -0,0 +1,13 @@
+const idObj = require('../test-redirections/idObjES6Import');
+
+describe('idObj', () => {
+  it('should return the key as a string', () => {
+    expect(idObj.foo).toBe('foo');
+  });
+  it('should support dot notation', () => {
+    expect(idObj.bar).toBe('bar');
+  });
+  it('should support bracket notation', () => {
+    expect(idObj[1]).toBe('1');
+  });
+});