Every row is a door: pressing it joins the channel. A closed room cannot be entered, so its row asks for access instead — the verb is on the row, and it does not change under the pointer.

      <.channel_list_panel
      id="channel-list"
      channels={@channels}
      on_search="filter_channels"
      on_join="join_channel"
      on_knock="knock_channel"
      />
    

Channel list showing the 'Searching...' state while fetching channels.