fix: suspend OTG live transfer on exit

suixinkanTests/TravelAlbumViewModelTests.swift

@@ -197,6 +197,17 @@ final class WiredCameraTransferViewModelTests: XCTestCase {
         XCTAssertEqual(driver.downloadedObjectIds, [])
         XCTAssertTrue(viewModel.filteredPhotos().isEmpty)
     }
+
+    func testStopSuspendsLiveTransferPolling() {
+        let context = makeOTGTestContext()
+        let manager = MockWiredCameraConnectionManager(driver: MockCameraDriver(objects: []))
+        let viewModel = makeWiredViewModel(context: context, manager: manager)
+
+        viewModel.start()
+        viewModel.stop()
+
+        XCTAssertEqual(manager.suspendLiveTransferCallCount, 1)
+    }
 }
 
 /// 旅拍相册相机历史导入 ViewModel 测试。
@@ -437,6 +448,7 @@ private final class MockWiredCameraConnectionManager: WiredCameraConnectionManag
     var state: ConnectionState
     var currentDriver: CameraDriver?
     var isContentCatalogReady: Bool
+    private(set) var suspendLiveTransferCallCount = 0
 
     init(
         state: ConnectionState = .connected(platform: .canon, deviceName: "Canon"),
@@ -451,6 +463,9 @@ private final class MockWiredCameraConnectionManager: WiredCameraConnectionManag
     func configureLiveTransfer(albumID: Int?) {}
     func start() {}
     func unbindDelegate() {}
+    func suspendLiveTransfer() {
+        suspendLiveTransferCallCount += 1
+    }
     func disconnect() {
         state = .disconnected
     }