StatisticsLive: load statistics only in handle_params

lib/mv_web/live/statistics_live.ex

@@ -15,12 +15,12 @@ defmodule MvWeb.StatisticsLive do
 
   @impl true
   def mount(_params, _session, socket) do
+    # Only static assigns and fee types here; load_statistics runs once in handle_params
     socket =
       socket
       |> assign(:page_title, gettext("Statistics"))
       |> assign(:selected_fee_type_id, nil)
       |> load_fee_types()
-      |> load_statistics()
 
     {:ok, socket}
   end