- Pager and sensor gain inputs changed from unvalidated text fields to
number inputs with min/max/step constraints
- ADS-B dashboard now exposes a gain input in the tracking strip;
previously gain was hardcoded to 40 dB with no user control
- validate_gain() ceiling raised from 50 to 102 dB to support HackRF
(LNA 40 + VGA 62 = 102 dB combined) and LimeSDR (73 dB)
- sdrCapabilities gain_max values corrected: HackRF 62→102, Airspy 21→45
- onSDRTypeChanged() now propagates gain_max to all mode gain inputs so
HTML constraints match the selected SDR's actual range
Closes#162
592e97719b