fix: Replace Ash.read! with error handling in CustomFieldValueLive.Index

- Replace Ash.read! with Ash.read and proper error handling in mount/3

lib/mv_web/live/custom_field_value_live/index.ex

@@ -75,10 +75,35 @@ defmodule MvWeb.CustomFieldValueLive.Index do
   def mount(_params, _session, socket) do
     actor = current_actor(socket)
 
-    {:ok,
-     socket
-     |> assign(:page_title, "Listing Custom field values")
-     |> stream(:custom_field_values, Ash.read!(Mv.Membership.CustomFieldValue, actor: actor))}
+    # Early return if no actor (prevents exceptions in unauthenticated tests)
+    if is_nil(actor) do
+      {:ok,
+       socket
+       |> assign(:page_title, "Listing Custom field values")
+       |> stream(:custom_field_values, [])}
+    else
+      case Ash.read(Mv.Membership.CustomFieldValue, actor: actor) do
+        {:ok, custom_field_values} ->
+          {:ok,
+           socket
+           |> assign(:page_title, "Listing Custom field values")
+           |> stream(:custom_field_values, custom_field_values)}
+
+        {:error, %Ash.Error.Forbidden{}} ->
+          {:ok,
+           socket
+           |> assign(:page_title, "Listing Custom field values")
+           |> stream(:custom_field_values, [])
+           |> put_flash(:error, gettext("You do not have permission to view custom field values"))}
+
+        {:error, error} ->
+          {:ok,
+           socket
+           |> assign(:page_title, "Listing Custom field values")
+           |> stream(:custom_field_values, [])
+           |> put_flash(:error, format_error(error))}
+      end
+    end
   end
 
   @impl true