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/book-copy.mjs

@@ -0,0 +1,17 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const BookCopy = createLucideIcon("BookCopy", [
+  ["path", { d: "M2 16V4a2 2 0 0 1 2-2h11", key: "spzkk5" }],
+  ["path", { d: "M5 14H4a2 2 0 1 0 0 4h1", key: "16gqf9" }],
+  [
+    "path",
+    { d: "M22 18H11a2 2 0 1 0 0 4h11V6H11a2 2 0 0 0-2 2v12", key: "1owzki" }
+  ]
+]);
+
+export { BookCopy as default };
+//# sourceMappingURL=book-copy.mjs.map