Nook 0.1.3

Calmer updates.

Changed

• Update state now lives in the About pane. Opening About quietly checks the feed and shows the result inline — an "Update to X" button when there's one, "You're on the latest version" otherwise. No more "You're up to date!" alert; Sparkle's window only appears for the actual install.

Requires macOS 27. Updating from an earlier version: Sparkle offers this automatically.