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/heading-3.mjs

@@ -0,0 +1,19 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const Heading3 = createLucideIcon("Heading3", [
+  ["path", { d: "M4 12h8", key: "17cfdx" }],
+  ["path", { d: "M4 18V6", key: "1rz3zl" }],
+  ["path", { d: "M12 18V6", key: "zqpxq5" }],
+  [
+    "path",
+    { d: "M17.5 10.5c1.7-1 3.5 0 3.5 1.5a2 2 0 0 1-2 2", key: "68ncm8" }
+  ],
+  ["path", { d: "M17 17.5c2 1.5 4 .3 4-1.5a2 2 0 0 0-2-2", key: "1ejuhz" }]
+]);
+
+export { Heading3 as default };
+//# sourceMappingURL=heading-3.mjs.map