Unread and Archived keep the feed under control

My SUMMary feed is beginning to grow, which means it needs a way to stay useful instead of becoming another endless backlog. I can now clear things from the active view without losing them, and older items can take care of themselves according to my preferences.

Changelog

• Added the ability to archive individual SUMMaries from the SUMMary feed.
• SUMMaries now have Unread and Archived views so older items can be cleared without losing access.
• Archived SUMMaries remain available with the same reading and playback controls.
• Fixed the SUMMaries header so the unread total matches the Unread view count.
• SUMMaries now load in smaller batches and continue loading as you scroll.
• Archived SUMMaries now keep the same feed order as Unread SUMMaries.
• SUMMaries can now move completed and older unplayed items into Archived automatically, keeping Unread cleaner while preserving access in the Archived view.