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/clean-css/lib/optimizer/level-2/restore-with-components.js

@@ -0,0 +1,12 @@
+var configuration = require('../configuration');
+
+function restoreWithComponents(property) {
+  var descriptor = configuration[property.name];
+
+  if (descriptor && descriptor.shorthand) {
+    return descriptor.restore(property, configuration);
+  }
+  return property.value;
+}
+
+module.exports = restoreWithComponents;