fix(hk): protect unsaved editors and await prefix save results

e2e/ui/fixtures/entry.tsx

@@ -16,6 +16,7 @@ import messages from "@/messages/en.json";
 import { AttachmentHarness } from "./attachment-harness";
 import { FurnitureJobsHarness } from "./furniture-jobs-harness";
 import { fixtureAction } from "./server-actions";
+import { UnsavedHarness } from "./unsaved-harness";
 
 const theme = document.createElement("style");
 theme.textContent = themePaletteCss(
@@ -105,7 +106,9 @@ createRoot(root).render(
 							? "News editor"
 							: "Furniture synchronization"}
 			</h1>
-			{route.includes("studio-harness") ? (
+			{route.includes("unsaved-harness") ? (
+				<UnsavedHarness />
+			) : route.includes("studio-harness") ? (
 				<StudioClient
 					source={buildFurniImportSource("it")}
 					initialTree={[]}