Add divider between week entries, and day entries

In [week] view, we have dividers between entries for each day.

However, there’s no clear separation between entries of that week, and the day entries that come after, which can look a bit cluttered if you have quite a few week entries, consisting of notes/to-dos/picture notes.

The same logic can apply to [day], [month], [year] view as well. Thanks. 😀