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/external-link.mjs

@@ -0,0 +1,20 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const ExternalLink = createLucideIcon("ExternalLink", [
+  [
+    "path",
+    {
+      d: "M18 13v6a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2V8a2 2 0 0 1 2-2h6",
+      key: "a6xqqp"
+    }
+  ],
+  ["polyline", { points: "15 3 21 3 21 9", key: "mznyad" }],
+  ["line", { x1: "10", x2: "21", y1: "14", y2: "3", key: "18c3s4" }]
+]);
+
+export { ExternalLink as default };
+//# sourceMappingURL=external-link.mjs.map