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/arrow-down-wide-narrow.mjs

@@ -0,0 +1,16 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const ArrowDownWideNarrow = createLucideIcon("ArrowDownWideNarrow", [
+  ["path", { d: "m3 16 4 4 4-4", key: "1co6wj" }],
+  ["path", { d: "M7 20V4", key: "1yoxec" }],
+  ["path", { d: "M11 4h10", key: "1w87gc" }],
+  ["path", { d: "M11 8h7", key: "djye34" }],
+  ["path", { d: "M11 12h4", key: "q8tih4" }]
+]);
+
+export { ArrowDownWideNarrow as default };
+//# sourceMappingURL=arrow-down-wide-narrow.mjs.map