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/test-tube.mjs

@@ -0,0 +1,20 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const TestTube = createLucideIcon("TestTube", [
+  [
+    "path",
+    {
+      d: "M14.5 2v17.5c0 1.4-1.1 2.5-2.5 2.5h0c-1.4 0-2.5-1.1-2.5-2.5V2",
+      key: "187lwq"
+    }
+  ],
+  ["path", { d: "M8.5 2h7", key: "csnxdl" }],
+  ["path", { d: "M14.5 16h-5", key: "1ox875" }]
+]);
+
+export { TestTube as default };
+//# sourceMappingURL=test-tube.mjs.map