diff --git a/A00_Common/design/design_page.ts b/A00_Common/design/design_page.ts
index 09230f52e..e130381d3 100644
--- a/A00_Common/design/design_page.ts
+++ b/A00_Common/design/design_page.ts
@@ -264,8 +264,10 @@ export function renderDesignPage(root: HTMLElement): MountedPage {
       void reconcilePagePipeline(projectId); // 들어올 때 입력(세션 · 가게) 대 묶음 맞춤(365-2)
     } else void mountView(view, true).ready.then(() => reconcilePagePipeline(projectId)); // 첫 마운트 뒤도(365-5)
     // 검증용 — 보기 전환에 든 시간(ms)과 횟수를 화면 밖에서 수치로 본다.
-    const probe = window as unknown as { __designPage?: { view: string; switchMs: number[] } };
-    probe.__designPage ??= { view, switchMs: [] };
+    const probe = window as unknown as {
+      __designPage?: { view: string; switchMs: number[]; lane?: unknown };
+    };
+    probe.__designPage ??= { view, switchMs: [], lane: shared.lane }; // 시설 줄(462) 알약 · 측점
     probe.__designPage.view = view;
     probe.__designPage.switchMs.push(Math.round(performance.now() - started));
   };