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/user-circle.mjs

@@ -0,0 +1,17 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const UserCircle = createLucideIcon("UserCircle", [
+  ["circle", { cx: "12", cy: "12", r: "10", key: "1mglay" }],
+  ["circle", { cx: "12", cy: "10", r: "3", key: "ilqhr7" }],
+  [
+    "path",
+    { d: "M7 20.662V19a2 2 0 0 1 2-2h6a2 2 0 0 1 2 2v1.662", key: "154egf" }
+  ]
+]);
+
+export { UserCircle as default };
+//# sourceMappingURL=user-circle.mjs.map