fix: add missing handle_info for state_sensors_updated in GraphLive.Show

Adds handler to reload graph data when state sensors are updated via PubSub,
preventing GenServer crash when viewing graph page during sensor updates.

lib/towerops_web/live/graph_live/show.ex

@@ -602,6 +602,12 @@ defmodule ToweropsWeb.GraphLive.Show do
     {:noreply, assign(socket, :device, device)}
   end
 
+  # Handle sensor updates from PubSub
+  @impl true
+  def handle_info({:state_sensors_updated, _device_id}, socket) do
+    {:noreply, load_graph_data(socket)}
+  end
+
   # Handle live poll event
   @impl true
   def handle_info(:live_poll, socket) do