Should Bangle.getStepCount() reset to zero at the start of each day?

"module health not found" is probably displayed on orange in the IDE? You don't have to worry about that - it's just the IDE saying it can't find it - but it'll be installed on your Bangle and will work fine.

However I'd suggest just using Bangle.getHealthStatus("day").steps which will return a step count that resets at midnight. It's a lot faster than asking the health module as I think that one may actually end up scanning through the file on the Bangle's storage to try and sum up the steps from every 10 minute interval.