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/copy-plus.mjs

@@ -0,0 +1,32 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const CopyPlus = createLucideIcon("CopyPlus", [
+  ["line", { x1: "15", x2: "15", y1: "12", y2: "18", key: "1p7wdc" }],
+  ["line", { x1: "12", x2: "18", y1: "15", y2: "15", key: "1nscbv" }],
+  [
+    "rect",
+    {
+      width: "14",
+      height: "14",
+      x: "8",
+      y: "8",
+      rx: "2",
+      ry: "2",
+      key: "17jyea"
+    }
+  ],
+  [
+    "path",
+    {
+      d: "M4 16c-1.1 0-2-.9-2-2V4c0-1.1.9-2 2-2h10c1.1 0 2 .9 2 2",
+      key: "zix9uf"
+    }
+  ]
+]);
+
+export { CopyPlus as default };
+//# sourceMappingURL=copy-plus.mjs.map