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Add an opt-in bell to the game HUD: the first click asks for the browser's notification permission, and the choice is remembered per device. A play by any other seat then raises a desktop notification with the player's name, the card and the next player, while the page is in the background and the viewer is actually seated in the game. Detect the newest play across the game families: scopone and scopa report it in last_move, while briscola and briscola chiamata only expose the trick, which mid-trick or once completed ends with the card just played. The first snapshot after every (re)connection is a resync baseline, so reconnects and the initial load never replay old moves; so are the viewer's own plays and the server's auto-plays. Deliver through the service worker registration (installed PWAs on Android reject page-context notifications), falling back to a page notification when no worker is active, under a per-game tag that replaces the previous move. sw.js now focuses the game window when a notification is clicked.