fix ui: copy invitation link on generation

frontend/app/components/shared/SessionItem/SessionItem.tsx

@@ -351,7 +351,7 @@ function SessionItem(props: RouteComponentProps & Props) {
             )}
           </div>
 
-          <div className="flex items-center">
+          <div className="flex items-center m-auto">
             <div
               className={cn(
                 stl.playLink,

frontend/app/mstore/userStore.ts

@@ -191,6 +191,7 @@ export default class UserStore {
               response.invitationLink
             );
           }
+          copy(response.invitationLink);
           resolve(response);
         })
         .catch((error) => {