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/core-js/proposals/collection-methods.js

@@ -0,0 +1,29 @@
+'use strict';
+// https://github.com/tc39/proposal-collection-methods
+require('../modules/esnext.map.group-by');
+require('../modules/esnext.map.key-by');
+require('../modules/esnext.map.delete-all');
+require('../modules/esnext.map.every');
+require('../modules/esnext.map.filter');
+require('../modules/esnext.map.find');
+require('../modules/esnext.map.find-key');
+require('../modules/esnext.map.includes');
+require('../modules/esnext.map.key-of');
+require('../modules/esnext.map.map-keys');
+require('../modules/esnext.map.map-values');
+require('../modules/esnext.map.merge');
+require('../modules/esnext.map.reduce');
+require('../modules/esnext.map.some');
+require('../modules/esnext.map.update');
+require('../modules/esnext.set.add-all');
+require('../modules/esnext.set.delete-all');
+require('../modules/esnext.set.every');
+require('../modules/esnext.set.filter');
+require('../modules/esnext.set.find');
+require('../modules/esnext.set.join');
+require('../modules/esnext.set.map');
+require('../modules/esnext.set.reduce');
+require('../modules/esnext.set.some');
+require('../modules/esnext.weak-map.delete-all');
+require('../modules/esnext.weak-set.add-all');
+require('../modules/esnext.weak-set.delete-all');