const STORAGE_KEY = 'gc_chartPriceExtremeLabels';

/** 실시간 차트 — 9·20일 신고가·신저가 라벨 표시 (기본 off) */
export function loadChartPriceExtremeLabelsVisible(): boolean {
  try {
    return localStorage.getItem(STORAGE_KEY) === '1';
  } catch {
    return false;
  }
}

export function saveChartPriceExtremeLabelsVisible(visible: boolean): void {
  try {
    localStorage.setItem(STORAGE_KEY, visible ? '1' : '0');
  } catch { /* ok */ }
}