v0.5.0: CAT token service improvements

- Improved Cashu Access Token handling
- Version bump to v0.5.0

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "smesh",
-  "version": "0.4.1",
+  "version": "0.5.0",
   "description": "A user-friendly Nostr client for exploring relay feeds",
   "private": true,
   "type": "module",