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/mail-x.mjs

@@ -0,0 +1,21 @@
+/**
+ * lucide-react v0.0.1 - ISC
+ */
+
+import createLucideIcon from '../createLucideIcon.mjs';
+
+const MailX = createLucideIcon("MailX", [
+  [
+    "path",
+    {
+      d: "M22 13V6a2 2 0 0 0-2-2H4a2 2 0 0 0-2 2v12c0 1.1.9 2 2 2h9",
+      key: "1j9vog"
+    }
+  ],
+  ["path", { d: "m22 7-8.97 5.7a1.94 1.94 0 0 1-2.06 0L2 7", key: "1ocrg3" }],
+  ["path", { d: "m17 17 4 4", key: "1b3523" }],
+  ["path", { d: "m21 17-4 4", key: "uinynz" }]
+]);
+
+export { MailX as default };
+//# sourceMappingURL=mail-x.mjs.map