chore: remove unused resend dependency

Email/password auth removed in favor of EncryptID passkeys.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -24,7 +24,6 @@
     "radix-ui": "^1.4.3",
     "react": "19.2.3",
     "react-dom": "19.2.3",
-    "resend": "^6.9.1",
     "sonner": "^2.0.7",
     "tailwind-merge": "^3.4.0"
   },