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/square-stack.mjs

@@ -0,0 +1,29 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const SquareStack = createLucideIcon("SquareStack", [
+  [
+    "path",
+    {
+      d: "M4 10c-1.1 0-2-.9-2-2V4c0-1.1.9-2 2-2h4c1.1 0 2 .9 2 2",
+      key: "4i38lg"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "M10 16c-1.1 0-2-.9-2-2v-4c0-1.1.9-2 2-2h4c1.1 0 2 .9 2 2",
+      key: "mlte4a"
+    }
+  ],
+  [
+    "rect",
+    { width: "8", height: "8", x: "14", y: "14", rx: "2", key: "1fa9i4" }
+  ]
+]);
+
+export { SquareStack as default };
+//# sourceMappingURL=square-stack.mjs.map