Add night light support for OasisMist 450S (LUH-O451S-WUSR) #65
Description
The OasisMist 450S (LUH-O451S-WUSR) has a controllable night light in the VeSync app, but the custom integration doesn't expose this entity in Home Assistant.
Device: LUH-O451S-WUSR (OasisMist 450S)
Integration: 1.3.3
HA Version: 2025.12.5
The integration creates 10 entities (humidifier, display switch, mist level, warm mist, humidity sensor, etc.) but no night light control.
The pyvesync library's VeSyncHumid200300S class has set_night_light_brightness() and the details dict includes night_light_brightness. I suspect the OasisMist 450S model config may be missing 'features': ['nightlight'] that other models like the Classic 300S have.
Would it be possible to add the nightlight feature flag for this model?
Thanks for maintaining this integration!
Cheers,