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/calculator.mjs

@@ -0,0 +1,24 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const Calculator = createLucideIcon("Calculator", [
+  [
+    "rect",
+    { width: "16", height: "20", x: "4", y: "2", rx: "2", key: "1nb95v" }
+  ],
+  ["line", { x1: "8", x2: "16", y1: "6", y2: "6", key: "x4nwl0" }],
+  ["line", { x1: "16", x2: "16", y1: "14", y2: "18", key: "wjye3r" }],
+  ["path", { d: "M16 10h.01", key: "1m94wz" }],
+  ["path", { d: "M12 10h.01", key: "1nrarc" }],
+  ["path", { d: "M8 10h.01", key: "19clt8" }],
+  ["path", { d: "M12 14h.01", key: "1etili" }],
+  ["path", { d: "M8 14h.01", key: "6423bh" }],
+  ["path", { d: "M12 18h.01", key: "mhygvu" }],
+  ["path", { d: "M8 18h.01", key: "lrp35t" }]
+]);
+
+export { Calculator as default };
+//# sourceMappingURL=calculator.mjs.map