refactor: simplify workbench layout and browser tests

tests/browser/agent-panel-resize.e2e.ts

@@ -1,4 +1,5 @@
 import { expect, test } from "@playwright/test";
+import { mockAgentApi } from "./support/mock-agent-api";
 
 test("Agent panel resizes within its responsive 720px workspace limit", async ({ page }) => {
   await page.goto("/", { waitUntil: "domcontentloaded" });
@@ -71,19 +72,18 @@ test.describe("mobile touch layout", () => {
   });
 });
 
-// Temporarily disabled: this regression flow would start a real Agent run.
-// Agent analysis must be explicitly triggered by a user, not by automated tests.
-test.skip("mobile alert summary opens the Agent conversation panel", async ({ page }) => {
+test("mobile alert summary opens the Agent conversation panel", async ({ page }) => {
+  await mockAgentApi(page);
   await page.clock.setFixedTime(new Date("2026-07-21T10:40:00+08:00"));
   await page.setViewportSize({ width: 375, height: 812 });
   await page.goto("/", { waitUntil: "domcontentloaded" });
 
   await page.getByRole("button", { name: /查看异常处置面板/ }).click();
-  // Agent execution must remain an explicit user action.
-  // await page.getByRole("button", { name: "工况汇总" }).click();
+  await page.getByRole("button", { name: "工况汇总" }).click();
 
   await expect(
     page.locator('aside[aria-label="Agent 命令面板"]').filter({ visible: true })
   ).toBeVisible();
   await expect(page.getByRole("button", { name: "关闭 Agent 面板" })).toBeVisible();
+  await expect(page.getByText("已发起工况汇总", { exact: true })).toBeVisible();
 });