Auto-select site when only one is available for new equipment

lib/towerops_web/live/equipment_live/form.ex

@@ -43,10 +43,19 @@ defmodule ToweropsWeb.EquipmentLive.Form do
     }
 
     equipment_attrs =
-      if socket.assigns.preselected_site_id do
-        Map.put(equipment_attrs, :site_id, socket.assigns.preselected_site_id)
-      else
-        equipment_attrs
+      cond do
+        # Use preselected site from URL params if available
+        socket.assigns.preselected_site_id ->
+          Map.put(equipment_attrs, :site_id, socket.assigns.preselected_site_id)
+
+        # Auto-select if there's only one site
+        length(socket.assigns.available_sites) == 1 ->
+          site = List.first(socket.assigns.available_sites)
+          Map.put(equipment_attrs, :site_id, site.id)
+
+        # Otherwise, leave it empty for user to select
+        true ->
+          equipment_attrs
       end
 
     changeset = Equipment.change_equipment(%EquipmentSchema{}, equipment_attrs)