feat(album): add pull-to-refresh to album entry

suixinkanTests/TravelAlbumViewModelTests.swift

@@ -123,6 +123,19 @@ final class TravelAlbumEntryViewModelTests: XCTestCase {
         XCTAssertEqual(viewModel.albums.first?.name, "A")
     }
 
+    func testPullRefreshFailureKeepsExistingAlbums() async {
+        let api = TravelAlbumMockAPI()
+        api.listResponse = TravelAlbumListResponse(total: 1, list: [TravelAlbum(id: 1, name: "A")])
+        let viewModel = TravelAlbumEntryViewModel(currentScenicIdProvider: { 1 })
+        await viewModel.loadAlbums(api: api)
+        api.listError = APIError.serverCode(500, "刷新失败")
+
+        await viewModel.refreshAlbums(api: api)
+
+        XCTAssertEqual(viewModel.albumTotal, 1)
+        XCTAssertEqual(viewModel.albums.map(\.id), [1])
+    }
+
     func testPreShootRequiresSinglePrice() async {
         let api = TravelAlbumMockAPI()
         let viewModel = TravelAlbumEntryViewModel(currentScenicIdProvider: { 1 })
@@ -1226,6 +1239,7 @@ final class TravelAlbumMockAPI: TravelAlbumServing {
 
     var availableOrdersResponse: [TravelAlbumAvailableOrder] = []
     var listResponse = TravelAlbumListResponse<TravelAlbum>()
+    var listError: Error?
     var createResponse = TravelAlbumCreateResponse(id: 0)
     var infoResponse = TravelAlbum()
     var materialListResponses: [TravelAlbumListResponse<TravelAlbumMaterial>] = []
@@ -1281,7 +1295,8 @@ final class TravelAlbumMockAPI: TravelAlbumServing {
     }
 
     func list(page: Int, pageSize: Int) async throws -> TravelAlbumListResponse<TravelAlbum> {
-        listResponse
+        if let listError { throw listError }
+        return listResponse
     }
 
     func info(id: Int) async throws -> TravelAlbum {