feat(auth-ui): add description to logout success screen

Provide clearer feedback to signed-out users by adding a description to the AuthCard, informing them that their session has ended and that they can safely close the tab or sign back in.

Author: yahyafakhroji

app/routes/logout/success.tsx

@@ -9,7 +9,14 @@ export const meta: MetaFunction = () => [{ title: 'Signed out' }];
 
 export default function LogoutSuccess() {
   return (
-    <AuthCard title={<Trans>You've been signed out</Trans>}>
+    <AuthCard
+      title={<Trans>You've been signed out</Trans>}
+      description={
+        <Trans>
+          Your session has ended and you've been securely signed out of Datum. You can safely close
+          this tab, or sign back in any time to pick up where you left off.
+        </Trans>
+      }>
       <TrackOnMount event="logout_completed" />
       <LinkButton theme="link" type="quaternary" as={Link} href="/">
         <Trans>Sign in again</Trans>