fix: disable SSE request cancellation for live game updates

The default Datastar requestCancellation:'auto' was causing SSE
connections to be cancelled whenever users interacted with the page
(making moves, sending chat messages, etc.), breaking live updates.

features/snakegame/pages/game.templ

@@ -33,7 +33,7 @@ templ GamePage(sg *snake.SnakeGame, mySlot int, messages []chat.Message, chatCfg
 		<main
 			class="snake-wrapper flex flex-col items-center gap-4 p-4"
 			data-signals={ `{"chatMsg":""}` }
-			data-init={ datastar.GetSSE("/snake/%s/events", gameID) }
+			data-init={ fmt.Sprintf("@get('/snake/%s/events',{requestCancellation:'disabled'})", gameID) }
 			data-on:keydown__throttle.100ms={ keydownScript(gameID) }
 			tabindex="0"
 		>