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/messages-square.mjs

@@ -0,0 +1,22 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const MessagesSquare = createLucideIcon("MessagesSquare", [
+  [
+    "path",
+    {
+      d: "M14 9a2 2 0 0 1-2 2H6l-4 4V4c0-1.1.9-2 2-2h8a2 2 0 0 1 2 2v5Z",
+      key: "16vlm8"
+    }
+  ],
+  [
+    "path",
+    { d: "M18 9h2a2 2 0 0 1 2 2v11l-4-4h-6a2 2 0 0 1-2-2v-1", key: "1cx29u" }
+  ]
+]);
+
+export { MessagesSquare as default };
+//# sourceMappingURL=messages-square.mjs.map