Add low lying area map editing

[dltacube]

Summary

• implement low-lying area editing for saved maps
• preserve the map payload key used for low-lying areas
• include saved low-lying area payload fields so creation and deletion persist across map refreshes

Testing

• python -m py_compile custom_components/dreame_vacuum/dreame/device.py custom_components/dreame_vacuum/dreame/map.py custom_components/dreame_vacuum/dreame/types.py
• git diff --check origin/dev..HEAD
• installed fork build in Home Assistant via HACS
• verified vacuum_set_low_lying_area creation persisted on both camera.todd_map and camera.todd_map_1 after refresh polling
• verified vacuum_set_low_lying_area deletion with an empty area list persisted on both camera.todd_map and camera.todd_map_1 after refresh polling

[dltacube]

@Tasshack did you have trouble with this feature and keeping the markers to stick?

[Tasshack]

I haven't reverse engineered this part of the official APP yet, that is why it is not supported. I have no idea how these work yet.

This is probably the part you are having an issue, it needs to return the key instead of area list.

        return {
            low_lying_area_key: areas_payload,
            "sneak_areas": areas_payload,
            "sneak_areas_end": areas_payload,
        }

[Tasshack]

This is also not correct, check other update_map_data calls.

return self.update_map_data_async(self._map_manager.editor.set_low_lying_areas(areas))