feat: tick live clock every second via SSE heartbeat

features/c4game/handlers.go

@@ -97,7 +97,7 @@ func HandleGameEvents(store *connect4.Store, svc *services.GameService, sm *scs.
 		defer cleanupChat()
 
 		// Setup heartbeat BEFORE creating SSE
-		heartbeat := time.NewTicker(10 * time.Second)
+		heartbeat := time.NewTicker(1 * time.Second)
 		defer heartbeat.Stop()
 
 		// NOW create SSE

features/common/components/shared.templ

@@ -48,7 +48,7 @@ templ NicknamePrompt(returnPath string) {
 	</main>
 }
 
-// LiveClock shows the current server time, updated with each SSE patch.
+// LiveClock shows the current server time, updated every second via SSE.
 // If the clock stops updating, users know the connection is stale.
 templ LiveClock() {
 	<div class="fixed top-2 right-2 flex items-center gap-1.5 text-xs opacity-60 font-mono">

features/snakegame/handlers.go

@@ -122,7 +122,7 @@ func HandleSnakeEvents(snakeStore *snake.SnakeStore, svc *services.GameService,
 			return
 		}
 
-		heartbeat := time.NewTicker(10 * time.Second)
+		heartbeat := time.NewTicker(1 * time.Second)
 		defer heartbeat.Stop()
 
 		// Chat subscription (multiplayer only)