Switched to the current standard Sparkle framework for software updates - fixes the "Updater.app is damaged" error on macOS 27 betas and the "org.sparkle-project.Downloader" warning
Fixed bug where an article updated during a refresh could reload the article view and reset the scroll position
Fixed bug where finishing a refresh could wrongly complete unrelated Activity Log activities, such as an in-progress feed subscribe
Stopped caching failed downloads, so retrying a feed right after a timeout tries the network instead of reporting the feed not found
Fixed bug where a download callback that started a new download of the same URL was silently dropped
Removed the system-generated Back and Forward commands from the article view contextual menu
