feat: improve oidc only mode

test/mv_web/plugs/check_page_permission_test.exs

@@ -181,13 +181,14 @@ defmodule MvWeb.Plugs.CheckPagePermissionTest do
   end
 
   describe "unauthenticated user" do
-    test "nil current_user is denied and redirected to \"/sign-in\"" do
+    test "nil current_user is denied and redirected to \"/sign-in\" without access-denied flash" do
       conn = conn_without_user("/members") |> CheckPagePermission.call([])
 
       assert conn.halted
       assert redirected_to(conn) == "/sign-in"
 
-      assert Phoenix.Flash.get(conn.assigns[:flash] || %{}, :error) ==
+      # Unauthenticated users are redirected to sign-in only; no "no permission" message.
+      refute Phoenix.Flash.get(conn.assigns[:flash] || %{}, :error) ==
                "You don't have permission to access this page."
     end
   end