fix: Reconnect MQTT client on disconnection errors

Co-authored-by: aider (gemini/gemini-2.5-pro) <aider@aider.chat>

main.py

@@ -66,14 +66,20 @@ async def process_mqtt(message, p):
 async def fetch_mqtt(p):
     await asyncio.sleep(3)
 
+    while True:
+        try:
             async with Client(
                 hostname='172.17.17.181',
                 port=1883,
             ) as client:
+                logging.info('MQTT client connected')
                 await client.subscribe('#')
                 async for message in client.messages:
                     loop = asyncio.get_event_loop()
                     loop.create_task(process_mqtt(message, p))
+        except aiomqtt.MqttError as e:
+            logging.warning('MQTT error: %s. Reconnecting in 5 seconds...', e)
+            await asyncio.sleep(5)
 
 
 async def manage_display(disp):