refactor(auth): separate SSO support from enterprise edition

Add dedicated isSSOSupported property to correctly identify when SSO
authentication is available, properly handling the 'msaas' edition
case separately from enterprise edition checks. This fixes SSO
visibility in the login interface.

frontend/app/components/Login/SSOLogin.tsx

@@ -14,7 +14,7 @@ interface SSOLoginProps {
 const SSOLogin = ({ authDetails, enforceSSO = false }: SSOLoginProps) => {
   const { userStore } = useStore();
   const { t } = useTranslation();
-  const { isEnterprise } = userStore;
+  const { isSSOSupported } = userStore;
 
   const getSSOLink = () =>
     window !== window.top
@@ -47,7 +47,7 @@ const SSOLogin = ({ authDetails, enforceSSO = false }: SSOLoginProps) => {
         <Tooltip
           title={
             <div className="text-center">
-              {isEnterprise ? (
+              {isSSOSupported ? (
                 <span>
                   {t('SSO has not been configured.')}
                   <br />

frontend/app/mstore/userStore.ts

@@ -114,12 +114,14 @@ class UserStore {
   get isEnterprise() {
     return (
       this.account?.edition === 'ee' ||
-      this.account?.edition === 'msaas' ||
+      this.authStore.authDetails?.edition === 'ee'
-      this.authStore.authDetails?.edition === 'ee' ||
-      this.authStore.authDetails?.edition === 'msaas'
     );
   }
 
+  get isSSOSupported() {
+    return this.isEnterprise || this.account?.edition === 'msaas' || this.authStore.authDetails?.edition === 'msaas';
+  }
+
   get isLoggedIn() {
     return Boolean(this.jwt);
   }