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/layout-list.mjs

@@ -0,0 +1,20 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const LayoutList = createLucideIcon("LayoutList", [
+  ["rect", { width: "7", height: "7", x: "3", y: "3", rx: "1", key: "1g98yp" }],
+  [
+    "rect",
+    { width: "7", height: "7", x: "3", y: "14", rx: "1", key: "1bb6yr" }
+  ],
+  ["path", { d: "M14 4h7", key: "3xa0d5" }],
+  ["path", { d: "M14 9h7", key: "1icrd9" }],
+  ["path", { d: "M14 15h7", key: "1mj8o2" }],
+  ["path", { d: "M14 20h7", key: "11slyb" }]
+]);
+
+export { LayoutList as default };
+//# sourceMappingURL=layout-list.mjs.map