test(app): wait for active agent controls and submitted turns

Observe the mode control before testing Command Center keyboard selection. Observe a running turn before waiting for its completion, so the rewind test cannot mistake the previous idle state and end marker for the new turn.

packages/app/e2e/browser/agent-message-rewind.spec.ts

@@ -21,8 +21,10 @@ async function completeSubmittedTurn(
   const userMessage = page.getByTestId("user-message").filter({ hasText: prompt });
   await expect(userMessage).toBeVisible();
 
+  await expectAgentReadyToInterrupt(page);
   const finish = await agent.client.waitForFinish(agent.agentId, 30_000);
   expect(finish.status).toBe("idle");
+  await expectAgentIdle(page);
   await expect(page.getByText("(end of synthetic stream)", { exact: true }).last()).toBeVisible();
   await expect(userMessage).toHaveAttribute("aria-busy", "false");
   return userMessage;

packages/app/e2e/support/helpers/command-center-agent-controls.ts

@@ -18,6 +18,9 @@ export async function openCommandCenterForAgent(
   workspace: Pick<MockAgentWorkspace, "workspaceId" | "agentId">,
 ): Promise<Locator> {
   await openAgentRoute(page, { workspaceId: workspace.workspaceId, agentId: workspace.agentId });
+  await expect(
+    page.getByRole("button", { name: /^Select agent mode \(/ }).filter({ visible: true }),
+  ).toBeVisible({ timeout: 30_000 });
   const panel = await openCommandCenter(page);
   return panel.getByTestId("command-center-input");
 }