refactor: remove code duplication using helper modules

lib/mv_web/live/member_live/index/field_visibility.ex

@@ -20,6 +20,8 @@ defmodule MvWeb.MemberLive.Index.FieldVisibility do
   3. Default (all fields visible)
   """
 
+  alias Mv.Membership.Helpers.VisibilityConfig
+
   @doc """
   Gets all available fields for selection.
 
@@ -177,7 +179,7 @@ defmodule MvWeb.MemberLive.Index.FieldVisibility do
   # Gets member field visibility from settings
   defp get_member_field_visibility_from_settings(settings) do
     visibility_config =
-      normalize_visibility_config(Map.get(settings, :member_field_visibility, %{}))
+      VisibilityConfig.normalize(Map.get(settings, :member_field_visibility, %{}))
 
     member_fields = Mv.Constants.member_fields()
 
@@ -201,27 +203,6 @@ defmodule MvWeb.MemberLive.Index.FieldVisibility do
     end)
   end
 
-  # Normalizes visibility config map keys from strings to atoms
-  defp normalize_visibility_config(config) when is_map(config) do
-    Enum.reduce(config, %{}, fn
-      {key, value}, acc when is_atom(key) ->
-        Map.put(acc, key, value)
-
-      {key, value}, acc when is_binary(key) ->
-        try do
-          atom_key = String.to_existing_atom(key)
-          Map.put(acc, atom_key, value)
-        rescue
-          ArgumentError -> acc
-        end
-
-      _, acc ->
-        acc
-    end)
-  end
-
-  defp normalize_visibility_config(_), do: %{}
-
   # Converts field string to atom (for member fields) or keeps as string (for custom fields)
   defp to_field_identifier(field_string) when is_binary(field_string) do
     if String.starts_with?(field_string, Mv.Constants.custom_field_prefix()) do