전략편집기 템플릿 삭제 기능 추가

frontend/src/utils/strategyTemplateStorage.ts

@@ -64,3 +64,17 @@ export function deleteUserStrategyTemplate(id: string): UserStrategyTemplate[] {
   saveUserStrategyTemplates(templates);
   return templates;
 }
+
+export function loadHiddenBuiltinTemplateIds(): string[] {
+  const raw = getUiPreferences().strategyEditor?.hiddenBuiltinTemplateIds;
+  if (!Array.isArray(raw)) return [];
+  return raw.filter((id): id is string => typeof id === 'string' && id.length > 0);
+}
+
+export function hideBuiltinTemplate(id: string): string[] {
+  const hidden = loadHiddenBuiltinTemplateIds();
+  if (hidden.includes(id)) return hidden;
+  const next = [...hidden, id];
+  patchUiPreferences({ strategyEditor: { hiddenBuiltinTemplateIds: next } });
+  return next;
+}