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/ruler.mjs

@@ -0,0 +1,22 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const Ruler = createLucideIcon("Ruler", [
+  [
+    "path",
+    {
+      d: "M21.3 15.3a2.4 2.4 0 0 1 0 3.4l-2.6 2.6a2.4 2.4 0 0 1-3.4 0L2.7 8.7a2.41 2.41 0 0 1 0-3.4l2.6-2.6a2.41 2.41 0 0 1 3.4 0Z",
+      key: "icamh8"
+    }
+  ],
+  ["path", { d: "m14.5 12.5 2-2", key: "inckbg" }],
+  ["path", { d: "m11.5 9.5 2-2", key: "fmmyf7" }],
+  ["path", { d: "m8.5 6.5 2-2", key: "vc6u1g" }],
+  ["path", { d: "m17.5 15.5 2-2", key: "wo5hmg" }]
+]);
+
+export { Ruler as default };
+//# sourceMappingURL=ruler.mjs.map