diff --git a/frontend/src/lib/history.dom.test.ts b/frontend/src/lib/history.dom.test.ts
index 9cef8b79..9f9be78c 100644
--- a/frontend/src/lib/history.dom.test.ts
+++ b/frontend/src/lib/history.dom.test.ts
@@ -14,7 +14,10 @@ import { renderHook, act } from "@testing-library/react";
 import { useBackToClose, useBackToExit } from "./history";
 
 // Let the mount effect's coalesced reconcile microtask settle.
-const settle = () => act(async () => { await Promise.resolve(); });
+const settle = () =>
+  act(async () => {
+    await Promise.resolve();
+  });
 // A genuine user Back (browser already dropped the entry; popstate arrives with no pending back()).
 const userBack = () =>
   act(() => {