I've found error, this function won't work, because in login screen, we not init relay yet

export function useChannelManager() {
  const pool = useContext(RelayContext) as PoolWithChannels
  if (!pool.__channels) {
    pool.__channels = new ChannelManager(pool)
  }
  const mgr = pool.__channels
  return mgr
}

in RelayProvider, I make relay only init when ident has present

const pool = useMemo(() => (ident ? new NostrPool(ident, db) : null), [privkey])

so in login screen, we not have ident (user not login) then relay will not work at this step

I wonder that can we make NostrPool not require ident in first place new NostrPool(ident, db), but can update ident it later, example: login/signup -> add indent to NostrPool

yes thats fine. a pool only needs relays unless you're posting messages