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/toy-brick.mjs

@@ -0,0 +1,17 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const ToyBrick = createLucideIcon("ToyBrick", [
+  [
+    "rect",
+    { width: "18", height: "12", x: "3", y: "8", rx: "1", key: "158fvp" }
+  ],
+  ["path", { d: "M10 8V5c0-.6-.4-1-1-1H6a1 1 0 0 0-1 1v3", key: "s0042v" }],
+  ["path", { d: "M19 8V5c0-.6-.4-1-1-1h-3a1 1 0 0 0-1 1v3", key: "9wmeh2" }]
+]);
+
+export { ToyBrick as default };
+//# sourceMappingURL=toy-brick.mjs.map