Phase B (T1-5/T1-6/T2-2/T2-8/T2-12): download manager flyout w/ speed+pause/resume/cancel, bookmark bar, tab sleeping, tab search (open+closed), context menu w/ 'download video from this link' (79 tests GREEN)

VideoDownloader.App/Browser/Features/DownloadOperationAdapter.cs

@@ -0,0 +1,39 @@
+using System.Windows.Data;
+using Microsoft.Web.WebView2.Core;
+
+namespace VideoDownloader.App.Browser.Features;
+
+/// <summary>CoreWebView2DownloadOperation → IDownloadOperation 어댑터.</summary>
+public sealed class DownloadOperationAdapter : IDownloadOperation
+{
+    private readonly CoreWebView2DownloadOperation _op;
+    public DownloadOperationAdapter(CoreWebView2DownloadOperation op) => _op = op;
+
+    public string Uri => _op.Uri ?? "";
+    public string FileName => Path.GetFileName(_op.ResultFilePath ?? "");
+    public long BytesReceived => (long)_op.BytesReceived;
+    public long TotalBytesToReceive => (long)(_op.TotalBytesToReceive ?? 0);
+    public string State => _op.State.ToString();
+
+    public void Pause() => _op.Pause();
+    public void Resume() => _op.Resume();
+    public void Cancel() => _op.Cancel();
+
+    public event Action? Changed
+    {
+        add { _op.BytesReceivedChanged += (_, _) => value?.Invoke(); _op.StateChanged += (_, _) => value?.Invoke(); }
+        remove { }
+    }
+}
+
+/// <summary>탭 검색 결과의 IsClosed → "닫힘" 라벨 변환.</summary>
+public sealed class BoolToClosedConverter : IValueConverter
+{
+    public static readonly BoolToClosedConverter Instance = new();
+
+    public object Convert(object? value, Type targetType, object? parameter, System.Globalization.CultureInfo culture)
+        => value is true ? "닫힘 · 클릭해서 복원" : "";
+
+    public object ConvertBack(object? value, Type targetType, object? parameter, System.Globalization.CultureInfo culture)
+        => throw new NotSupportedException();
+}