feat(album): add pull-to-refresh to management grid

suixinkanTests/TravelAlbumDetailViewControllerTests.swift

@@ -7,9 +7,50 @@ import UIKit
 import XCTest
 @testable import suixinkan
 
-/// 相册管理页选择态底部操作区测试。
+/// 相册管理页刷新、预览与选择态交互测试。
 @MainActor
 final class TravelAlbumDetailViewControllerTests: XCTestCase {
+    func testPullToRefreshReloadsGridAndEndsRefreshing() async throws {
+        let api = TravelAlbumMockAPI()
+        api.infoResponse = TravelAlbum(id: 2, name: "测试相册")
+        api.materialListResponses = [
+            TravelAlbumListResponse(total: 1, list: []),
+            TravelAlbumListResponse(total: 0, list: []),
+            TravelAlbumListResponse(total: 1, list: [TravelAlbumMaterial(id: 1)]),
+            TravelAlbumListResponse(total: 2, list: []),
+            TravelAlbumListResponse(total: 1, list: []),
+            TravelAlbumListResponse(
+                total: 2,
+                list: [TravelAlbumMaterial(id: 1), TravelAlbumMaterial(id: 2)]
+            ),
+        ]
+        let controller = TravelAlbumDetailViewController(albumId: 2, api: api)
+        let window = UIWindow(frame: CGRect(x: 0, y: 0, width: 390, height: 844))
+        window.rootViewController = controller
+        window.makeKeyAndVisible()
+        defer { window.isHidden = true }
+        controller.loadViewIfNeeded()
+        controller.view.layoutIfNeeded()
+        let collectionView = try XCTUnwrap(
+            controller.view.findSubview { $0 is UICollectionView } as? UICollectionView
+        )
+        let refreshControl = try XCTUnwrap(collectionView.refreshControl)
+        await waitUntil { api.materialRequests.count == 3 }
+
+        refreshControl.beginRefreshing()
+        XCTAssertTrue(refreshControl.isRefreshing)
+        refreshControl.sendActions(for: .valueChanged)
+        await waitUntil {
+            api.materialRequests.count == 6
+                && !refreshControl.isRefreshing
+                && collectionView.numberOfItems(inSection: 0) == 2
+        }
+
+        XCTAssertEqual(refreshControl.accessibilityIdentifier, "travelAlbum.refreshControl")
+        XCTAssertEqual(collectionView.numberOfItems(inSection: 0), 2)
+        XCTAssertFalse(refreshControl.isRefreshing)
+    }
+
     func testPreviewDeleteHandlerCallsMaterialAPIAndPreservesServerFailure() async {
         let api = TravelAlbumMockAPI()
         let handler = TravelAlbumPreviewActionHandler(api: api)