Handle many items in Highlights Widget

[soyacz]

This is followup for #499

When there's many Highlights/Action items , It takes quite a lot of screen and it's hard to navigate.
We need to:

1. add scroll to archived items
2. delete old items automatically (e.g. if archived and if there's more than 100 items, delete the oldest ones)
3. allow user to delete manually an item (only in archive list).