Tests: use code interface for Member create/update (actor propagation)

test/mv_web/member_live/show_membership_fees_test.exs

@@ -6,7 +6,6 @@ defmodule MvWeb.MemberLive.ShowMembershipFeesTest do
 
   import Phoenix.LiveViewTest
 
-  alias Mv.Membership.Member
   alias Mv.MembershipFees.MembershipFeeType
   alias Mv.MembershipFees.MembershipFeeCycle
 
@@ -40,10 +39,8 @@ defmodule MvWeb.MemberLive.ShowMembershipFeesTest do
     }
 
     attrs = Map.merge(default_attrs, attrs)
-
-    Member
-    |> Ash.Changeset.for_create(:create_member, attrs)
-    |> Ash.create!(actor: system_actor)
+    {:ok, member} = Mv.Membership.create_member(attrs, actor: system_actor)
+    member
   end
 
   # Helper to create a cycle