feat: unify page titles

lib/mv_web/live/group_live/index.ex

@@ -28,7 +28,7 @@ defmodule MvWeb.GroupLive.Index do
 
       {:ok,
        socket
-       |> assign(:page_title, gettext("Groups"))
+       |> Layouts.assign_page_title(gettext("Groups"))
        |> assign(:groups, groups)}
     else
       {:ok, redirect(socket, to: ~p"/members")}
@@ -40,7 +40,7 @@ defmodule MvWeb.GroupLive.Index do
     ~H"""
     <Layouts.app flash={@flash} current_user={@current_user}>
       <.header>
-        {gettext("Groups")}
+        {@content_title}
         <:actions>
           <%= if can?(@current_user, :create, Mv.Membership.Group) do %>
             <.button navigate={~p"/groups/new"} variant="primary">