fix: rollover tasks

[theantichris]

GetItems() in internal/models/daily/items.go was rolling over all tasks from the prior day regardless of status. Since I expressed some opinions in this fix I want to break it out in case there needs to be discussion.

1. I am only rolling over pending and started tasks
2. Started tasks keep the started status (Bullet Journal ideology)
3. I extracted the filter to a helper function to make it testable
4. Added unit tests just for this change (I would like add tests for any new changes I make)

I am happy to make changes is this doesn't fit with your vision for the code.

If and when this is merged in please release.

[theantichris]

@NucleoFusion I don't think this fix got released.

[NucleoFusion]

Done