New 'Зарядка' activity type records a session with no GPS - no location
service, no watchPosition, no track points - just the heart-rate poll and a
timer, for indoor exercise. kcal comes from HR (Keytel gross minus BMR, net
like the rest of the app) and counts in the daily balance.
- gps.js: GPS.hrKcalNet; startRecording/stopRecording 'workout' branches;
the HR poll appends [relSec,bpm] samples.
- db.js: gps_sessions.hr_samples column + setSessionHrSamples.
- main.js: 'Зарядка (пульс)' option; renderWorkoutInline (map-less live
screen: big HR, timer, kcal, connect-sensor button); renderWorkoutDetail
(HR chart by zones, load, avg/max).
- tools/hr_log.py: background HR logger (standard 0x180D, no pairing).
Sensor read from the desktop confirmed on a Coospo H808S (F7:72:74:A4:FB:07,
~1 Hz) without pairing.