Add Guest Arrived button (no-op placeholder)

custom_components/room_cal_ha/button.py

@@ -27,6 +27,7 @@ async def async_setup_entry(
     PromoteFromNextButton(coordinator, entry, device_name),
     ClearCurrentButton(coordinator, entry, device_name),
     TestNextGuestButton(coordinator, entry, device_name),
+    GuestArrivedButton(coordinator, entry, device_name),
   ])
 
 
@@ -122,3 +123,25 @@ class TestNextGuestButton(CoordinatorEntity[RoomCalCoordinator], ButtonEntity):
       "check_in_time": check_in_dt.time().replace(second=0, microsecond=0),
     })
     await self.coordinator.async_start_override(OverrideData(current=override_current))
+
+
+class GuestArrivedButton(ButtonEntity):
+  _attr_has_entity_name = True
+  _attr_name = "Guest Arrived"
+  _attr_icon = "mdi:account-arrow-right"
+
+  def __init__(
+    self,
+    coordinator: RoomCalCoordinator,
+    entry: ConfigEntry,
+    device_name: str,
+  ) -> None:
+    self._coordinator = coordinator
+    self._attr_unique_id = f"{entry.entry_id}_guest_arrived"
+    self._attr_device_info = DeviceInfo(
+      identifiers={(DOMAIN, f"{entry.entry_id}_room_state")},
+      name=device_name,
+    )
+
+  async def async_press(self) -> None:
+    pass