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/send-to-back.mjs

@@ -0,0 +1,18 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const SendToBack = createLucideIcon("SendToBack", [
+  [
+    "rect",
+    { x: "14", y: "14", width: "8", height: "8", rx: "2", key: "1b0bso" }
+  ],
+  ["rect", { x: "2", y: "2", width: "8", height: "8", rx: "2", key: "1x09vl" }],
+  ["path", { d: "M7 14v1a2 2 0 0 0 2 2h1", key: "pao6x6" }],
+  ["path", { d: "M14 7h1a2 2 0 0 1 2 2v1", key: "19tdru" }]
+]);
+
+export { SendToBack as default };
+//# sourceMappingURL=send-to-back.mjs.map