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/build/jest.js

@@ -0,0 +1,61 @@
+'use strict';
+
+Object.defineProperty(exports, '__esModule', {
+  value: true
+});
+Object.defineProperty(exports, 'SearchSource', {
+  enumerable: true,
+  get: function () {
+    return _core().SearchSource;
+  }
+});
+Object.defineProperty(exports, 'TestWatcher', {
+  enumerable: true,
+  get: function () {
+    return _core().TestWatcher;
+  }
+});
+Object.defineProperty(exports, 'createTestScheduler', {
+  enumerable: true,
+  get: function () {
+    return _core().createTestScheduler;
+  }
+});
+Object.defineProperty(exports, 'getVersion', {
+  enumerable: true,
+  get: function () {
+    return _core().getVersion;
+  }
+});
+Object.defineProperty(exports, 'run', {
+  enumerable: true,
+  get: function () {
+    return _jestCli().run;
+  }
+});
+Object.defineProperty(exports, 'runCLI', {
+  enumerable: true,
+  get: function () {
+    return _core().runCLI;
+  }
+});
+
+function _core() {
+  const data = require('@jest/core');
+
+  _core = function () {
+    return data;
+  };
+
+  return data;
+}
+
+function _jestCli() {
+  const data = require('jest-cli');
+
+  _jestCli = function () {
+    return data;
+  };
+
+  return data;
+}