feat(workbench): add manual task refresh

tests/browser/operational-task-approval.e2e.ts

@@ -197,13 +197,15 @@ test("审批动作展示中文参数和证据，viewer 不可审批，冲突后
     alert_availability: "not_configured", generated_at: "2026-09-23T08:30:00Z",
     conditions: [], alerts: [], scenarios: [], latest_analysis: null, work_orders: []
   };
-  await page.route("http://server.test/api/v1/workbench/sync-snapshot", (route) =>
-    route.fulfill({ json: {
+  let snapshotRequests = 0;
+  await page.route("http://server.test/api/v1/workbench/sync-snapshot", (route) => {
+    snapshotRequests += 1;
+    return route.fulfill({ json: {
       schema: "workbench-sync-snapshot@1", event_cursor: 0, runtime: runtimeSnapshot,
       tasks: [summary(task), summary(appointmentTask)], notifications: [],
       generated_at: "2026-09-23T08:30:00Z"
-    } })
-  );
+    } });
+  });
   await page.route("http://server.test/api/v1/workbench/events**", (route) =>
     route.fulfill({ contentType: "text/event-stream", body: ": test keepalive\n\n" })
   );
@@ -267,6 +269,10 @@ test("审批动作展示中文参数和证据，viewer 不可审批，冲突后
   await expect(conditionPanel.getByRole("button", { name: /定时任务/ })).toContainText("模拟数据");
   await expect(conditionPanel.getByRole("button", { name: /调查任务/ })).toContainText("后端");
   await expect(conditionPanel.getByRole("button", { name: /预约任务/ })).toContainText("后端");
+  const conditionRefreshButton = conditionPanel.getByRole("button", { name: "刷新工况任务" });
+  await expect(conditionRefreshButton).toBeVisible();
+  await conditionRefreshButton.click();
+  await expect.poll(() => snapshotRequests).toBe(2);
   await conditionPanel.getByRole("button", { name: "配置定时流程" }).click();
   await conditionPanel.getByLabel("定时流程名称").fill("夜间阀门巡检");
   await conditionPanel.getByLabel("任务说明").fill("每十五分钟检查预约维修涉及的边界阀门。");