feat: unify page titles

lib/mv_web/live/user_live/show.ex

@@ -48,7 +48,7 @@ defmodule MvWeb.UserLive.Show do
             {gettext("Back")}
           </.button>
         </:leading>
-        {gettext("User")} {@user.email}
+        {@content_title}
         <:actions>
           <%= if can?(@current_user, :update, @user) do %>
             <.button
@@ -179,9 +179,11 @@ defmodule MvWeb.UserLive.Show do
        |> put_flash(:error, gettext("This user cannot be viewed."))
        |> push_navigate(to: ~p"/users")}
     else
+      content_title = gettext("User %{email}", email: user.email)
+
       {:ok,
        socket
-       |> assign(:page_title, gettext("Show User"))
+       |> Layouts.assign_page_title(content_title)
        |> assign(:user, user)
        |> assign(:show_delete_modal, false)}
     end