Add pump battery to info display and alarm options

[mjliedtke]

- Add pumpBattery to InfoType enum for Information Display table
- Parse pump battery percentage from Nightscout API (pump.battery.percent)
- Add pumpBatteryLevel observable for alarm data
- Add pumpBattery alarm type with threshold-based triggering
- Create PumpBatteryCondition for alarm evaluation
- Register pump battery alarm in AlarmManager

[bjorkert]

Thanks for the new PR — it looks good overall.
One suggestion: instead of reusing the same SF Symbol as the looping phone’s low battery (battery.25), it might be better to use something like powermeter to clearly differentiate the two.

For the sound, I think it’s reasonable to reuse the same one (soundFile = .machineCharge).

Reusing the same editor is a clever trick, but I think it deserves a short comment, so anyone changing BatteryAlarmEditor in the future understands that it affects both alarms.

[mjliedtke]

Great. Thanks for the feedback and that all makes sense.

[mjliedtke]

@bjorkert I'm actually now wondering if would be better to split the Editor so that the info text makes sense.

[bjorkert]

Sounds good!