refactor: Replace actor option patterns with ash_actor_opts helper

- Replace if actor, do: [actor: actor], else: [] with Mv.Helpers.ash_actor_opts/1
- Update email_sync/loader.ex, member validations, member.ex, cycle_generator.ex
- Consistent actor handling across non-LiveView modules

lib/mv/membership/member/validations/email_not_used_by_other_user.ex

@@ -8,6 +8,7 @@ defmodule Mv.Membership.Member.Validations.EmailNotUsedByOtherUser do
   This allows creating members with the same email as unlinked users.
   """
   use Ash.Resource.Validation
+  alias Mv.Helpers
 
   @doc """
   Validates email uniqueness across linked Member-User pairs.
@@ -51,7 +52,7 @@ defmodule Mv.Membership.Member.Validations.EmailNotUsedByOtherUser do
       |> Ash.Query.filter(email == ^email)
       |> maybe_exclude_id(exclude_user_id)
 
-    opts = if actor, do: [actor: actor], else: []
+    opts = Helpers.ash_actor_opts(actor)
 
     case Ash.read(query, opts) do
       {:ok, []} ->
@@ -69,7 +70,7 @@ defmodule Mv.Membership.Member.Validations.EmailNotUsedByOtherUser do
   defp maybe_exclude_id(query, id), do: Ash.Query.filter(query, id != ^id)
 
   defp get_linked_user_id(member_data, actor) do
-    opts = if actor, do: [actor: actor], else: []
+    opts = Helpers.ash_actor_opts(actor)
 
     case Ash.load(member_data, :user, opts) do
       {:ok, %{user: %{id: id}}} -> id