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/@testing-library/user-event/dist/utils/click/isClickableInput.js

@@ -0,0 +1,14 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.isClickableInput = isClickableInput;
+
+var _isElementType = require("../misc/isElementType");
+
+const CLICKABLE_INPUT_TYPES = ['button', 'color', 'file', 'image', 'reset', 'submit', 'checkbox', 'radio'];
+
+function isClickableInput(element) {
+  return (0, _isElementType.isElementType)(element, 'button') || (0, _isElementType.isElementType)(element, 'input') && CLICKABLE_INPUT_TYPES.includes(element.type);
+}