Fix: update OAuth2 state storage initialization and state token encoding

src/api/admin.rs

@@ -370,7 +370,7 @@ fn oauth2_authorize(_token: AdminToken) -> Result<Redirect, Error> {
     let scopes = CONFIG.smtp_oauth2_scopes();
 
     // Generate a random state token for CSRF protection
-    let state = crate::crypto::encode_random_bytes::<32>(BASE64URL_NOPAD);
+    let state = crate::crypto::encode_random_bytes::<32>(&BASE64URL_NOPAD);
 
     // Store state with expiration (10 minutes from now)
     let expiration = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs() + 600;