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/eslint-plugin-jsx-a11y/lib/util/isDisabledElement.js

@@ -0,0 +1,23 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports["default"] = void 0;
+var _jsxAstUtils = require("jsx-ast-utils");
+var isDisabledElement = function isDisabledElement(attributes) {
+  var disabledAttr = (0, _jsxAstUtils.getProp)(attributes, 'disabled');
+  var disabledAttrValue = (0, _jsxAstUtils.getPropValue)(disabledAttr);
+  var isHTML5Disabled = disabledAttr && disabledAttrValue !== undefined;
+  if (isHTML5Disabled) {
+    return true;
+  }
+  var ariaDisabledAttr = (0, _jsxAstUtils.getProp)(attributes, 'aria-disabled');
+  var ariaDisabledAttrValue = (0, _jsxAstUtils.getLiteralPropValue)(ariaDisabledAttr);
+  if (ariaDisabledAttr && ariaDisabledAttrValue !== undefined && ariaDisabledAttrValue === true) {
+    return true;
+  }
+  return false;
+};
+var _default = exports["default"] = isDisabledElement;
+module.exports = exports.default;