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/lodash/_baseUnset.js

@@ -0,0 +1,20 @@
+var castPath = require('./_castPath'),
+    last = require('./last'),
+    parent = require('./_parent'),
+    toKey = require('./_toKey');
+
+/**
+ * The base implementation of `_.unset`.
+ *
+ * @private
+ * @param {Object} object The object to modify.
+ * @param {Array|string} path The property path to unset.
+ * @returns {boolean} Returns `true` if the property is deleted, else `false`.
+ */
+function baseUnset(object, path) {
+  path = castPath(path, object);
+  object = parent(object, path);
+  return object == null || delete object[toKey(last(path))];
+}
+
+module.exports = baseUnset;