superguardado: fixes pi_bot (offset persistente, unit systemd) + voz.py (desconectar chromecast) + lecciones 27-31

vigilancia/voz.py

@@ -231,6 +231,15 @@ def _url_silencio():
     return f"http://{_ip_lan()}:{config.GOOGLE_TV_PUERTO}/{os.path.basename(ruta)}"
 
 
+def _desconectar(chromecasts):
+    for cc in chromecasts:
+        try:
+            if cc.is_active and cc.is_connected:
+                cc.disconnect()
+        except Exception:
+            pass
+
+
 def _reproducir_y_esperar(c, url, content_type, titulo, desc):
     c.media_controller.play_media(url, content_type, title=titulo)
     print(f"[Voz] {desc}")
@@ -307,6 +316,7 @@ def anuncio_en_teles(texto):
                 except Exception as e:
                     print(f"[Voz] Error en {c.cast_info.friendly_name}: {e}")
         finally:
+            _desconectar(chromecasts)
             pychromecast.discovery.stop_discovery(browser)
     except Exception as e:
         print(f"[Voz] Error de casting: {e}")
@@ -358,6 +368,7 @@ def youtube_en_teles(url):
                 except Exception as e:
                     print(f"[Voz] Error en {c.cast_info.friendly_name}: {e}")
         finally:
+            _desconectar(chromecasts)
             pychromecast.discovery.stop_discovery(browser)
     except Exception as e:
         print(f"[Voz] Error YouTube: {e}")
@@ -414,6 +425,7 @@ def anuncio_simple(texto):
                 except Exception as e:
                     print(f"[Voz] Error en {c.cast_info.friendly_name}: {e}")
         finally:
+            _desconectar(chromecasts)
             pychromecast.discovery.stop_discovery(browser)
     except Exception as e:
         print(f"[Voz] Error de casting: {e}")