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/lucide-react/dist/esm/icons/thumbs-down.mjs

@@ -0,0 +1,19 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const ThumbsDown = createLucideIcon("ThumbsDown", [
+  ["path", { d: "M17 14V2", key: "8ymqnk" }],
+  [
+    "path",
+    {
+      d: "M9 18.12 10 14H4.17a2 2 0 0 1-1.92-2.56l2.33-8A2 2 0 0 1 6.5 2H20a2 2 0 0 1 2 2v8a2 2 0 0 1-2 2h-2.76a2 2 0 0 0-1.79 1.11L12 22h0a3.13 3.13 0 0 1-3-3.88Z",
+      key: "s6e0r"
+    }
+  ]
+]);
+
+export { ThumbsDown as default };
+//# sourceMappingURL=thumbs-down.mjs.map