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/function-square.mjs

@@ -0,0 +1,25 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const FunctionSquare = createLucideIcon("FunctionSquare", [
+  [
+    "rect",
+    {
+      width: "18",
+      height: "18",
+      x: "3",
+      y: "3",
+      rx: "2",
+      ry: "2",
+      key: "1m3agn"
+    }
+  ],
+  ["path", { d: "M9 17c2 0 2.8-1 2.8-2.8V10c0-2 1-3.3 3.2-3", key: "m1af9g" }],
+  ["path", { d: "M9 11.2h5.7", key: "3zgcl2" }]
+]);
+
+export { FunctionSquare as default };
+//# sourceMappingURL=function-square.mjs.map