feat(chat): simplify socket response

Add helper methods to create the tuples `{:ok, socket}` and
`{:noreply, socket}`, and make them available in `SlaxWeb` module.

lib/slax_web/live/chat_room_live/index.ex

@@ -62,13 +62,11 @@ defmodule SlaxWeb.ChatRoomLive.Index do
   def mount(_params, _session, socket) do
     rooms = Chat.list_rooms_with_joined(socket.assigns.current_user)
 
-    socket =
-      socket
-      |> assign(page_title: "All rooms")
-      |> stream_configure(:rooms, dom_id: fn {room, _joined?} -> "rooms-#{room.id}" end)
-      |> stream(:rooms, rooms)
-
-    {:ok, socket}
+    socket
+    |> assign(page_title: "All rooms")
+    |> stream_configure(:rooms, dom_id: fn {room, _joined?} -> "rooms-#{room.id}" end)
+    |> stream(:rooms, rooms)
+    |> ok()
   end
 
   @impl Phoenix.LiveView
@@ -78,7 +76,9 @@ defmodule SlaxWeb.ChatRoomLive.Index do
       |> Chat.get_room!()
       |> Chat.toggle_room_membership(socket.assigns.current_user)
 
-    {:noreply, stream_insert(socket, :rooms, {room, joined?})}
+    socket
+    |> stream_insert(:rooms, {room, joined?})
+    |> noreply()
   end
 
   defp open_room(room) do