Journal: Show overdue/incomplete items from earlier time blocks

When the app auto-switches to Afternoon, incomplete Morning habits disappear from view. This makes it easy to forget things I meant to do earlier in the day.

Similar to how Apple Reminders' Today view shows past-due items, the current time block could display incomplete habits from earlier blocks – maybe in a collapsible "Earlier" or "Overdue" section at the top.

This could be optional – configurable via settings – but I’d suggest enabling it by default.