feat: unify page titles

lib/mv_web/plugs/assign_club_name.ex

@@ -0,0 +1,22 @@
+defmodule MvWeb.Plugs.AssignClubName do
+  @moduledoc """
+  Assigns :club_name from settings for controller-rendered pages.
+  Used by the root layout to build the browser tab title (Mila · Club · Page).
+  LiveViews set club_name in on_mount instead.
+  """
+  import Plug.Conn
+
+  alias Mv.Membership
+
+  def init(opts), do: opts
+
+  def call(conn, _opts) do
+    club_name =
+      case Membership.get_settings() do
+        {:ok, settings} when is_binary(settings.club_name) -> settings.club_name
+        _ -> nil
+      end
+
+    assign(conn, :club_name, club_name)
+  end
+end