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.ex

@@ -237,24 +237,22 @@ defmodule SlaxWeb.ChatRoomLive do
 
     Enum.each(rooms, &Chat.subscribe_to_room/1)
 
-    socket =
-      socket
-      |> assign(
-        hide_topic?: false,
-        online_users: OnlineUsers.list(),
-        rooms: rooms,
-        timezone: timezone,
-        users: users
-      )
-      |> assign_room_form(Chat.change_room(%Room{}))
-      |> stream_configure(:messages,
-        dom_id: fn
-          %Message{id: id} -> "messages-#{id}"
-          :unread_marker -> "messages-unread-marker"
-        end
-      )
-
-    {:ok, socket}
+    socket
+    |> assign(
+      hide_topic?: false,
+      online_users: OnlineUsers.list(),
+      rooms: rooms,
+      timezone: timezone,
+      users: users
+    )
+    |> assign_room_form(Chat.change_room(%Room{}))
+    |> stream_configure(:messages,
+      dom_id: fn
+        %Message{id: id} -> "messages-#{id}"
+        :unread_marker -> "messages-unread-marker"
+      end
+    )
+    |> ok()
   end
 
   @impl Phoenix.LiveView
@@ -274,28 +272,28 @@ defmodule SlaxWeb.ChatRoomLive do
 
     Chat.update_last_read_id(room, socket.assigns.current_user)
 
-    {:noreply,
-     socket
-     |> assign(
-       hide_topic?: false,
-       joined?: Chat.joined?(room, socket.assigns.current_user),
-       page_title: "# #{room.name}",
-       room: room
-     )
-     |> stream(:messages, messages, reset: true)
-     |> assign_message_form(Chat.change_message(%Message{}))
-     |> push_event("scroll_messages_to_bottom", %{})
-     |> update(:rooms, fn rooms ->
-       room_id = room.id
+    socket
+    |> assign(
+      hide_topic?: false,
+      joined?: Chat.joined?(room, socket.assigns.current_user),
+      page_title: "# #{room.name}",
+      room: room
+    )
+    |> stream(:messages, messages, reset: true)
+    |> assign_message_form(Chat.change_message(%Message{}))
+    |> push_event("scroll_messages_to_bottom", %{})
+    |> update(:rooms, fn rooms ->
+      room_id = room.id
 
-       Enum.map(rooms, fn
-         %Room{id: ^room_id} = room ->
-           %Room{room | unread_message_count: 0}
+      Enum.map(rooms, fn
+        %Room{id: ^room_id} = room ->
+          %Room{room | unread_message_count: 0}
 
-         other_room ->
-           other_room
-       end)
-     end)}
+        other_room ->
+          other_room
+      end)
+    end)
+    |> noreply()
   end
 
   @impl Phoenix.LiveView