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/@jest/core/build/jest.js

@@ -0,0 +1,49 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+Object.defineProperty(exports, 'SearchSource', {
+  enumerable: true,
+  get: function () {
+    return _SearchSource.default;
+  }
+});
+Object.defineProperty(exports, 'TestWatcher', {
+  enumerable: true,
+  get: function () {
+    return _TestWatcher.default;
+  }
+});
+Object.defineProperty(exports, 'createTestScheduler', {
+  enumerable: true,
+  get: function () {
+    return _TestScheduler.createTestScheduler;
+  }
+});
+Object.defineProperty(exports, 'getVersion', {
+  enumerable: true,
+  get: function () {
+    return _version.default;
+  }
+});
+Object.defineProperty(exports, 'runCLI', {
+  enumerable: true,
+  get: function () {
+    return _cli.runCLI;
+  }
+});
+
+var _SearchSource = _interopRequireDefault(require('./SearchSource'));
+
+var _TestScheduler = require('./TestScheduler');
+
+var _TestWatcher = _interopRequireDefault(require('./TestWatcher'));
+
+var _cli = require('./cli');
+
+var _version = _interopRequireDefault(require('./version'));
+
+function _interopRequireDefault(obj) {
+  return obj && obj.__esModule ? obj : {default: obj};
+}