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/pen-square.mjs

@@ -0,0 +1,22 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const PenSquare = createLucideIcon("PenSquare", [
+  [
+    "path",
+    {
+      d: "M11 4H4a2 2 0 0 0-2 2v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2v-7",
+      key: "1qinfi"
+    }
+  ],
+  [
+    "path",
+    { d: "M18.5 2.5a2.12 2.12 0 0 1 3 3L12 15l-4 1 1-4Z", key: "w2jsv5" }
+  ]
+]);
+
+export { PenSquare as default };
+//# sourceMappingURL=pen-square.mjs.map