fix(ui): enforce allow_users permission in share chat modal (#25915)

src/lib/components/chat/ShareChatModal.svelte

@@ -159,6 +159,8 @@
 							bind:accessGrants
 							accessRoles={['read']}
 							sharePublic={$user?.permissions?.sharing?.public_chats || $user?.role === 'admin'}
+							shareUsers={($user?.permissions?.access_grants?.allow_users ?? true) ||
+								$user?.role === 'admin'}
 							onChange={saveAccessGrants}
 						/>
 					</div>