Add user parameter requirement to isConditionalPasskeysEnabled method

This change modifies the method signature to require a UserModel parameter
for proper user context validation during conditional passkey checks.

Author: bobharper208

services/src/main/java/org/keycloak/authentication/authenticators/browser/UsernamePasswordForm.java

@@ -112,7 +112,7 @@ public void authenticate(AuthenticationFlowContext context) {
             }
         }
         // setup webauthn data when passkeys enabled
-        if (isConditionalPasskeysEnabled()) {
+        if (isConditionalPasskeysEnabled(context.getUser())) {
             webauthnAuth.fillContextForm(context);
         }
         Response challengeResponse = challenge(context, formData);
@@ -134,7 +134,7 @@ protected Response challenge(AuthenticationFlowContext context, MultivaluedMap<S
 
     @Override
     protected Response challenge(AuthenticationFlowContext context, String error, String field) {
-        if (isConditionalPasskeysEnabled()) {
+        if (isConditionalPasskeysEnabled(context.getUser())) {
             // setup webauthn data when possible
             webauthnAuth.fillContextForm(context);
         }
@@ -157,8 +157,8 @@ public void close() {
 
     }
 
-    protected boolean isConditionalPasskeysEnabled() {
-        return webauthnAuth != null && webauthnAuth.isPasskeysEnabled();
+    protected boolean isConditionalPasskeysEnabled(UserModel user) {
+        return webauthnAuth != null && webauthnAuth.isPasskeysEnabled() && user != null;
     }
 
 }