Quick "show read items" toggle #20

Is your feature request related to a problem? Please describe.

When I have a channel set to "show unread only," it would be nice to be able to quickly peek at already-read items in case there's one I saw recently which I'd like to revisit, without having to change my channel settings.

Describe the solution you'd like

Having a quick toggle in the corner of the channel view would be useful for this.