Feat: Hide Read Posts button

[slrgt]

Describe the feature you'd like to request

A button the hides read posts so people can come back to Graysky in the evening and only catch up on the posts they still haven't read. Posts are marked as read automatically after you scroll past them.

Describe the solution you'd like to see

A button that hides all read posts. Similar to how Voyager for Lemmy does it

Additional information

long pressing the Hide Read Posts button should bring back all hidden posts so people can find posts they already saw