Use current_actor/1 helper in all LiveViews

Replace inconsistent actor access patterns with current_actor/1 helper
and ensure actor is passed to all Ash operations for proper authorization.

lib/mv_web/live/user_live/index.ex

@@ -23,9 +23,13 @@ defmodule MvWeb.UserLive.Index do
   use MvWeb, :live_view
   import MvWeb.TableComponents
 
+  on_mount {MvWeb.LiveHelpers, :ensure_user_role_loaded}
+  import MvWeb.LiveHelpers, only: [current_actor: 1]
+
   @impl true
   def mount(_params, _session, socket) do
-    users = Ash.read!(Mv.Accounts.User, domain: Mv.Accounts, load: [:member])
+    actor = current_actor(socket)
+    users = Ash.read!(Mv.Accounts.User, domain: Mv.Accounts, load: [:member], actor: actor)
     sorted = Enum.sort_by(users, & &1.email)
 
     {:ok,