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/calendar.mjs

@@ -0,0 +1,26 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const Calendar = createLucideIcon("Calendar", [
+  [
+    "rect",
+    {
+      width: "18",
+      height: "18",
+      x: "3",
+      y: "4",
+      rx: "2",
+      ry: "2",
+      key: "eu3xkr"
+    }
+  ],
+  ["line", { x1: "16", x2: "16", y1: "2", y2: "6", key: "m3sa8f" }],
+  ["line", { x1: "8", x2: "8", y1: "2", y2: "6", key: "18kwsl" }],
+  ["line", { x1: "3", x2: "21", y1: "10", y2: "10", key: "xt86sb" }]
+]);
+
+export { Calendar as default };
+//# sourceMappingURL=calendar.mjs.map