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/dumbbell.mjs

@@ -0,0 +1,18 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const Dumbbell = createLucideIcon("Dumbbell", [
+  ["path", { d: "m6.5 6.5 11 11", key: "f7oqzb" }],
+  ["path", { d: "m21 21-1-1", key: "cpc6if" }],
+  ["path", { d: "m3 3 1 1", key: "d3rpuf" }],
+  ["path", { d: "m18 22 4-4", key: "1e32o6" }],
+  ["path", { d: "m2 6 4-4", key: "189tqz" }],
+  ["path", { d: "m3 10 7-7", key: "1bxui2" }],
+  ["path", { d: "m14 21 7-7", key: "16x78n" }]
+]);
+
+export { Dumbbell as default };
+//# sourceMappingURL=dumbbell.mjs.map