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/picture-in-picture.mjs

@@ -0,0 +1,22 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const PictureInPicture = createLucideIcon("PictureInPicture", [
+  [
+    "path",
+    {
+      d: "M8 4.5v5H3m-1-6 6 6m13 0v-3c0-1.16-.84-2-2-2h-7m-9 9v2c0 1.05.95 2 2 2h3",
+      key: "bcd8fb"
+    }
+  ],
+  [
+    "rect",
+    { width: "10", height: "7", x: "12", y: "13.5", ry: "2", key: "136fx3" }
+  ]
+]);
+
+export { PictureInPicture as default };
+//# sourceMappingURL=picture-in-picture.mjs.map