fix: resolve race condition in pause/resume check

- replace direct check of pomodoroPaused with IsPomodoroPaused function

internal/pomodoro/timer.go

@@ -23,7 +23,7 @@ func startTimer(clients map[*websocket.Conn]*models.Client, remainingSeconds int
 			mu.Unlock()
 		default:
 			// Broadcast the current state to all clients
-			if !pomodoroPaused {
+			if !IsPomodoroPaused() {
 				broadcast.BroadcastMessage(clients, models.BroadcastMessage{
 					Mode:       mode,
 					Session:    session,