[local-explorer-ui] Fixed adding default worker per review.

Author: tpmmorris

packages/local-explorer-ui/src/__e2e__/worker-selector.spec.ts

@@ -179,6 +179,68 @@ describe("worker selector", () => {
 		);
 	});
 
+	test("keeps workerless Message-ID detail lookups unfiltered", async ({
+		expect,
+	}) => {
+		const requestedWorkers: Array<string | null> = [];
+		const requestedEmailIds: Array<string | null> = [];
+		await page.route(EMAIL_ROUTING_DETAIL_ROUTE, async (route) => {
+			const search = new URL(route.request().url()).searchParams;
+			const emailId = search.get("email_id");
+			if (emailId !== null) {
+				requestedWorkers.push(search.get("worker"));
+				requestedEmailIds.push(emailId);
+			}
+			await route.fulfill({
+				contentType: "application/json",
+				body: JSON.stringify({
+					errors: [],
+					messages: [],
+					result:
+						emailId === null
+							? []
+							: {
+									attachments: [],
+									events: [],
+									forwards: [],
+									from: "legacy@example.com",
+									headers: {},
+									messageId: emailId,
+									outcome: "ok",
+									raw: "Content-Type: text/plain\r\n\r\nLegacy body",
+									rawSize: 11,
+									receivedAt: "2026-09-11T00:00:00.000Z",
+									replies: [],
+									subject: "Legacy detail",
+									text: "Legacy body",
+									to: "recipient@example.com",
+									worker: "worker-2",
+								},
+					result_info:
+						emailId === null
+							? { count: 0, has_more: false, per_page: 10 }
+							: undefined,
+					success: true,
+				}),
+			});
+		});
+		await loadWorkers(2);
+
+		const messageId = "<legacy@example.com>";
+		await page.goto(
+			new URL(
+				`/cdn-cgi/local/explorer/email/routing/${encodeURIComponent(messageId)}?lookup=message-id`,
+				viteUrl
+			).toString()
+		);
+
+		await page.getByText("Legacy detail").last().waitFor();
+		expect(new URL(page.url()).searchParams.get("worker")).toBeNull();
+		await expect.poll(() => requestedEmailIds.length).toBeGreaterThan(0);
+		expect(requestedEmailIds.every((id) => id === messageId)).toBe(true);
+		expect(requestedWorkers.every((worker) => worker === null)).toBe(true);
+	});
+
 	test("discards stale email lists after switching workers", async ({
 		expect,
 	}) => {

packages/local-explorer-ui/src/routes/email.tsx

@@ -10,7 +10,10 @@ import { getSelectedWorker } from "../components/WorkerSelector";
 
 export const Route = createFileRoute("/email")({
 	component: EmailLayout,
-	validateSearch: (search: Record<string, unknown>): { worker?: string } => ({
+	validateSearch: (
+		search: Record<string, unknown>
+	): { lookup?: "message-id"; worker?: string } => ({
+		lookup: search.lookup === "message-id" ? "message-id" : undefined,
 		worker: typeof search.worker === "string" ? search.worker : undefined,
 	}),
 });
@@ -52,7 +55,11 @@ function EmailLayout(): JSX.Element {
 		// no longer visible, preserve the requested identity so the detail API can
 		// report it as missing or unavailable instead of targeting the default Worker.
 		if (routingDetailParams) {
-			if (search.worker !== undefined || selectedWorker === "") {
+			if (
+				search.lookup === "message-id" ||
+				search.worker !== undefined ||
+				selectedWorker === ""
+			) {
 				return;
 			}
 			void navigate({
@@ -74,7 +81,14 @@ function EmailLayout(): JSX.Element {
 				to: listRoute,
 			});
 		}
-	}, [listRoute, navigate, routingDetailParams, search.worker, selectedWorker]);
+	}, [
+		listRoute,
+		navigate,
+		routingDetailParams,
+		search.lookup,
+		search.worker,
+		selectedWorker,
+	]);
 
 	return <Outlet />;
 }