feat: conistent danger zone delete flow

lib/mv_web/live/datafields_live.ex

@@ -101,6 +101,17 @@ defmodule MvWeb.DatafieldsLive do
     {:noreply, assign(socket, :active_editing_section, section)}
   end
 
+  # Open delete modal for custom field (triggered from Danger zone in FormComponent)
+  @impl true
+  def handle_info({:open_delete_modal_for, custom_field}, socket) do
+    send_update(MvWeb.CustomFieldLive.IndexComponent,
+      id: "custom-fields-component",
+      open_delete_for_id: custom_field.id
+    )
+
+    {:noreply, socket}
+  end
+
   @impl true
   def handle_info({:member_field_saved, _member_field, action}, socket) do
     {:ok, updated_settings} = Membership.get_settings()