보조지표 전체보기 후 복귀버튼 추가

frontend/src/utils/indicatorPaneFocus.ts

@@ -0,0 +1,32 @@
+import type { IndicatorConfig } from '../types';
+import { getPaneHostId } from './indicatorPaneMerge';
+
+/** 단독 전체보기(focusedId) 대상 pane 항목인지 — 호스트·병합 멤버 id 모두 매칭 */
+export function isIndicatorPaneFocused(
+  itemId: string,
+  focusedId: string | null | undefined,
+  indicators: IndicatorConfig[],
+): boolean {
+  if (!focusedId) return false;
+  if (itemId === focusedId) return true;
+
+  const itemCfg = indicators.find(i => i.id === itemId);
+  const focusCfg = indicators.find(i => i.id === focusedId);
+  if (itemCfg?.mergedWith === focusedId) return true;
+  if (focusCfg?.mergedWith === itemId) return true;
+  if (focusCfg?.mergedWith && itemCfg?.mergedWith === focusCfg.mergedWith) return true;
+
+  const itemHost = getPaneHostId(itemId, indicators);
+  const focusHost = getPaneHostId(focusedId, indicators);
+  return itemHost === focusedId || itemHost === focusHost || itemId === focusHost;
+}
+
+/** focusedId 에 해당하는 pane 레이아웃 조회용 id (병합 시 호스트 우선) */
+export function resolveFocusedPaneLayoutId(
+  focusedId: string,
+  indicators: IndicatorConfig[],
+): string {
+  const cfg = indicators.find(i => i.id === focusedId);
+  if (cfg?.mergedWith) return cfg.mergedWith;
+  return getPaneHostId(focusedId, indicators);
+}