Add support for zones

[puetsch]

Checklist

• I checked for similar existing requests (both open and closed) before posting.
• My request is generic, other users may benefit from it too.
• I will participate in further discussion about this feature and can test it (if requested) once it's done.

Proposal

Add zones to the list of entities that can be used in the scheduler card.

Additional info

I'd like some schedules to only run if there's at least one person at home. The zones.home counter provides this info but I'm seemingly unable to add it to the scheduler card (tried through UI or direct YAML config). I think this is a common use case that many people will enjoy, and likely not too hard to add.

[github-actions]

This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 7 days

[puetsch]

Still relevant.