While charging, show battery state instead of clock

[wmertens]

Verification

• I searched for similar feature request and found none was relevant.

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It would be great to see the recharging state while charging

Description

I wear the watch all the time so I'd love to see the charge state and estimated time until full while it's charging.

It would also be nice to have the backlight be on, to see progress at a glance (not sure if that cuts into the charging time by a lot)