Using state, properties, or router to track an "actively selected?"

  const removeLesson = (thisId: string, index: number) => {
    const lessons = fieldArray.state.value;
    const isCurrent = currentLessonId === thisId;

    const nextId = lessons[index + 1]?.id ?? lessons[index - 1]?.id;

    if (isCurrent) {
      router.navigate(
        nextId
          ? ludoNavigation.build.toBuilderModule(courseId, nextId) //changes the search param of moduleId
          : ludoNavigation.build.toSelectCourse() // Should not happen, so as fallback navigate back
      );
    }

    fieldArray.removeValue(index);
  };