refactor: Use submit_form wrapper in all LiveView forms

- Replace AshPhoenix.Form.submit with submit_form/3 wrapper
- Import current_actor and submit_form from LiveHelpers
- Consistent actor handling in all form submissions

lib/mv_web/live/global_settings_live.ex

@@ -79,7 +79,9 @@ defmodule MvWeb.GlobalSettingsLive do
 
   @impl true
   def handle_event("save", %{"setting" => setting_params}, socket) do
-    case AshPhoenix.Form.submit(socket.assigns.form, params: setting_params) do
+    actor = MvWeb.LiveHelpers.current_actor(socket)
+
+    case MvWeb.LiveHelpers.submit_form(socket.assigns.form, setting_params, actor) do
       {:ok, _updated_settings} ->
         # Reload settings from database to ensure all dependent data is updated
         {:ok, fresh_settings} = Membership.get_settings()