fix: prevent back-button trap on device show page

push_patch without replace: true created a history entry loop:
/devices/:id → /devices/:id?tab=overview, so hitting back would
immediately redirect forward again, trapping the user.

lib/towerops_web/live/device_live/show.ex

@@ -66,7 +66,7 @@ defmodule ToweropsWeb.DeviceLive.Show do
           {:noreply, socket}
         else
           # Redirect to add default tab to URL
-          {:noreply, push_patch(socket, to: ~p"/devices/#{id}?tab=overview")}
+          {:noreply, push_patch(socket, to: ~p"/devices/#{id}?tab=overview", replace: true)}
         end
 
       {:error, :not_found} ->