test(app): reproduce silent revert of the archive merged PR workspaces switch

When the host rejects the change, the switch goes back to off and no
message is shown on web or desktop. Refs #5769.

packages/app/e2e/browser/settings-auto-archive-merged.spec.ts

@@ -0,0 +1,42 @@
+import { readFile, writeFile } from "node:fs/promises";
+import path from "node:path";
+import { expect, test, type Page } from "../support/fixtures";
+import { gotoAppShell, openSettings } from "../support/helpers/app";
+import { getServerId } from "../support/helpers/server-id";
+import { openHostSection, openSettingsHost } from "../support/helpers/settings";
+
+// Reproduction for https://github.com/getpaseo/paseo/issues/5769: when the host rejects
+// the change, the switch goes back to off and the app says nothing about why.
+test.describe("Archive merged PR workspaces setting", () => {
+  test("a rejected change tells the user why the switch went back off", async ({ page }) => {
+    const serverId = getServerId();
+    await gotoAppShell(page);
+    await openSettings(page);
+    await openSettingsHost(page, serverId);
+    await openHostSection(page, serverId, "workspaces");
+    const toggle = archiveMergedSwitch(page);
+    await expect(toggle).toHaveAttribute("aria-checked", "false");
+
+    await withUnreadableDaemonConfig(async () => {
+      await toggle.click();
+
+      await expect(toggle).toHaveAttribute("aria-checked", "false");
+      await expect(page.getByText("Unable to update workspaces")).toBeVisible();
+    });
+  });
+});
+
+function archiveMergedSwitch(page: Page) {
+  return page.getByRole("switch", { name: "Archive merged PR workspaces" });
+}
+
+async function withUnreadableDaemonConfig(run: () => Promise<void>): Promise<void> {
+  const configPath = path.join(process.env.E2E_PASEO_HOME!, "config.json");
+  const original = await readFile(configPath, "utf8");
+  await writeFile(configPath, "{ not json");
+  try {
+    await run();
+  } finally {
+    await writeFile(configPath, original);
+  }
+}