When a new service worker takes control, the app shows an UPDATE button. If the page is hidden, the app reloads into the new version. It does not reload while the entry editor is open or while a save or import runs. A running timer continues after the reload, because it is stored with its start time in IndexedDB. The app asks for a new version when it becomes visible and one time each hour, because an installed PWA can stay open for days. Co-Authored-By: Claude Opus 5.5 <[email protected]>