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/csso/lib/clean/index.js

@@ -0,0 +1,20 @@
+var walk = require('css-tree').walk;
+var handlers = {
+    Atrule: require('./Atrule'),
+    Comment: require('./Comment'),
+    Declaration: require('./Declaration'),
+    Raw: require('./Raw'),
+    Rule: require('./Rule'),
+    TypeSelector: require('./TypeSelector'),
+    WhiteSpace: require('./WhiteSpace')
+};
+
+module.exports = function(ast, options) {
+    walk(ast, {
+        leave: function(node, item, list) {
+            if (handlers.hasOwnProperty(node.type)) {
+                handlers[node.type].call(this, node, item, list, options);
+            }
+        }
+    });
+};