가상매매 화면 멀티 레이아웃 수정

frontend/src/utils/virtualTradingStorage.ts

@@ -1,5 +1,10 @@
 import { resolveVirtualTargetNames } from './virtualTargetNames';
 import { getUiPreferences, patchUiPreferences } from './uiPreferencesDb';
+import {
+  DEFAULT_TRADE_NOTIFICATION_GRID_PRESET,
+  normalizeTradeNotificationGridPreset,
+  type TradeNotificationGridPresetId,
+} from './tradeNotificationGridPresets';
 
 /** 가상투자 대상 종목·세션 설정 (DB ui_preferences + per-market live settings) */
 
@@ -91,3 +96,13 @@ export function loadVirtualCardViewMode(): VirtualCardViewMode {
 export function saveVirtualCardViewMode(mode: VirtualCardViewMode): void {
   patchUiPreferences({ virtual: { cardViewMode: mode } });
 }
+
+export function loadVirtualGridPreset(): TradeNotificationGridPresetId {
+  return normalizeTradeNotificationGridPreset(
+    getUiPreferences().virtual?.gridPreset ?? DEFAULT_TRADE_NOTIFICATION_GRID_PRESET,
+  );
+}
+
+export function saveVirtualGridPreset(preset: TradeNotificationGridPresetId): void {
+  patchUiPreferences({ virtual: { gridPreset: preset } });
+}