fix: better filename resolution, choosing another agent works

manifest.json

@@ -4,6 +4,6 @@
   "version": "0.1.0",
   "minAppVersion": "1.5.0",
   "description": "Send the current note to a Beaver agent via the markdown frontend.",
-  "author": "Beaver",
+  "author": "h",
   "isDesktopOnly": false
 }