- SensorManager::getAvailableLPPTypes() reports which LPP types will be
present based on initialized sensor flags (temp, humidity, pressure, etc.)
- Sensors page renders one row per available type; shows "--" for any sensor
that hasn't produced a reading yet instead of hiding the row entirely
- LPPReader: add readLuminosity, readPercentage, readConcentration, readDistance
- All known LPP types now have proper names and units in the sensor display
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>