refactor: consolidate reorder handlers in device_live

Extract common pattern from perform_site_reorder/4 and perform_device_reorder/4
into a single perform_reorder/4 helper function.

Both reorder handlers now delegate to the shared helper, reducing duplication
and making the reload/regroup/flash pattern consistent.

- Reduces code from 40 lines to 28 lines
- Maintains identical behavior (all tests pass)
- Uses static gettext strings to satisfy compile-time requirements

lib/towerops_web/live/device_live/index.ex

@@ -167,44 +167,44 @@ defmodule ToweropsWeb.DeviceLive.Index do
   end
 
   defp perform_site_reorder(socket, site_id, new_position, organization_id) do
-    # Handle both integer and string input
     position = if is_integer(new_position), do: new_position, else: String.to_integer(new_position)
-
-    case Sites.reorder_site(site_id, position) do
-      {:ok, _site} ->
-        # Reload devices with updated order
-        devices = Devices.list_organization_devices(organization_id)
-        grouped_devices = group_devices_by_site(devices)
-
-        {:noreply,
-         socket
-         |> assign(:device, devices)
-         |> assign(:grouped_devices, grouped_devices)
-         |> put_flash(:info, t_equipment("Site order updated"))}
-
-      {:error, _changeset} ->
-        {:noreply, put_flash(socket, :error, t_equipment("Failed to reorder site"))}
-    end
+    result = Sites.reorder_site(site_id, position)
+    perform_reorder(socket, result, "site", organization_id)
   end
 
   defp perform_device_reorder(socket, device_id, new_position, organization_id) do
-    # Handle both integer and string input
     position = if is_integer(new_position), do: new_position, else: String.to_integer(new_position)
+    result = Devices.reorder_device(device_id, position)
+    perform_reorder(socket, result, "device", organization_id)
+  end
 
-    case Devices.reorder_device(device_id, position) do
-      {:ok, _device} ->
+  defp perform_reorder(socket, reorder_result, resource_name, organization_id) do
+    case reorder_result do
+      {:ok, _} ->
         # Reload devices with updated order
         devices = Devices.list_organization_devices(organization_id)
         grouped_devices = group_devices_by_site(devices)
 
+        success_message =
+          case resource_name do
+            "site" -> t_equipment("Site order updated")
+            "device" -> t_equipment("Device order updated")
+          end
+
         {:noreply,
          socket
          |> assign(:device, devices)
          |> assign(:grouped_devices, grouped_devices)
-         |> put_flash(:info, t_equipment("Device order updated"))}
+         |> put_flash(:info, success_message)}
 
       {:error, _changeset} ->
-        {:noreply, put_flash(socket, :error, t_equipment("Failed to reorder device"))}
+        error_message =
+          case resource_name do
+            "site" -> t_equipment("Failed to reorder site")
+            "device" -> t_equipment("Failed to reorder device")
+          end
+
+        {:noreply, put_flash(socket, :error, error_message)}
     end
   end