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Add the VOC field (VMGI index 10) as an optional sensor, mirroring the CO2 handling: reads 0 on models without the sensor (e.g. FlowPlus).
Add the front-light auto-off timer: async_set_light_timer (VMWH14, seconds, clamped to 0..999 min) plus the light_timer field decoded from VMGO index 14. The timer scale was verified live on a FlowPlus.