Adds a LEDManager class (src/helpers/ui/LEDManager.h) that centralizes
all LED control into one component with begin()/loop() lifecycle and
per-pin active-HIGH/LOW polarity support.
LED settings are exposed as custom vars (led.status, led.activity)
accessible via companion radio binary protocol, CLI set/get commands,
and the SensorManager settings interface.
Status LED modes: off, boot-30s, slow blink (200ms/4s), always on.
Activity LED modes: off, BLE only, LoRa TX only, BLE + LoRa TX.
Integrated into 23 board variants, replacing scattered hardcoded
digitalWrite calls in onBeforeTransmit/onAfterTransmit/powerOff.
As all NRF52 boards now have OTA support, let's remove the subclass
and integrate it into the base class.
Signed-off-by: Frieder Schrempf <frieder@fris.de>
Some NRF52 boards are able to use the internal power-efficient DC/DC
regulator. Add a new class that can be inherited by board classes to
enable this feature and reduce the power consumption.
Signed-off-by: Frieder Schrempf <frieder@fris.de>
Use a common begin() method that can be called from derived classes
to contain the shared initialization code.
Signed-off-by: Frieder Schrempf <frieder@fris.de>
