Phase C (T2-1..T3-10): command palette, reader mode (real Readability.js, E2E), boost force-dark, screenshot, split view, vertical tabs, Glance (Alt+click), tab groups (6 colors), workspaces, speed dial, InPrivate tabs, quick find, source view, print, PiP, TTS (94 tests GREEN)

VideoDownloader.App/Browser/GlanceWindow.xaml.cs

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+using System.Windows.Controls;
+using System.Windows;
+using System.Windows.Interop;
+using Microsoft.Web.WebView2.Core;
+using VideoDownloader.Core.Config;
+using Wv2 = Microsoft.Web.WebView2.Wpf;
+
+namespace VideoDownloader.App.Browser;
+
+/// <summary>T2-6 Glance: Alt+클릭 링크의 플로팅 미리보기(Zen Glance 패턴) — 닫기/탭으로 승격.</summary>
+public partial class GlanceWindow : Window
+{
+    private readonly Wv2.WebView2 _web = new() { DefaultBackgroundColor = System.Drawing.Color.Black };
+    private readonly CoreWebView2Environment _env;
+    private readonly AppConfig _config;
+
+    public string Url { get; }
+    public event Action<GlanceWindow>? ExpandRequested;
+
+    public GlanceWindow(CoreWebView2Environment env, AppConfig config, string url)
+    {
+        _env = env;
+        _config = config;
+        Url = url;
+
+        Width = 720; Height = 520;
+        WindowStartupLocation = WindowStartupLocation.CenterOwner;
+        ResizeMode = ResizeMode.CanResize;
+
+        var bar = new Border
+        {
+            Background = System.Windows.Media.Brushes.Black,
+            Padding = new Thickness(8, 6, 8, 6)
+        };
+        var dock = new DockPanel();
+        var close = new Button { Content = "✕ 닫기", Padding = new Thickness(10, 3, 10, 3), Margin = new Thickness(4, 0, 4, 0), Background = System.Windows.Media.Brushes.Transparent, Foreground = System.Windows.Media.Brushes.White, BorderBrush = System.Windows.Media.Brushes.Gray };
+        close.Click += (_, _) => Close();
+        var expand = new Button { Content = "⤢ 탭으로 열기", Padding = new Thickness(10, 3, 10, 3), Background = System.Windows.Media.Brushes.Transparent, Foreground = System.Windows.Media.Brushes.White, BorderBrush = System.Windows.Media.Brushes.Gray };
+        expand.Click += (_, _) => ExpandRequested?.Invoke(this);
+        var title = new TextBlock { Text = url, Foreground = System.Windows.Media.Brushes.LightGray, FontSize = 11, VerticalAlignment = VerticalAlignment.Center, TextTrimming = TextTrimming.CharacterEllipsis };
+        DockPanel.SetDock(close, Dock.Right);
+        DockPanel.SetDock(expand, Dock.Right);
+        dock.Children.Add(close);
+        dock.Children.Add(expand);
+        dock.Children.Add(title);
+        bar.Child = dock;
+
+        var grid = new Grid { RowDefinitions = { new RowDefinition { Height = GridLength.Auto }, new RowDefinition { Height = new GridLength(1, GridUnitType.Star) } } };
+        Grid.SetRow(bar, 0); Grid.SetRow(_web, 1);
+        grid.Children.Add(bar);
+        grid.Children.Add(_web);
+        Content = grid;
+
+        Loaded += async (_, _) =>
+        {
+            try
+            {
+                var options = _env.CreateCoreWebView2ControllerOptions();
+                if (_config.PrivateMode) options.IsInPrivateModeEnabled = true;
+                await _web.EnsureCoreWebView2Async(_env, options);
+                _web.CoreWebView2!.Navigate(url);
+            }
+            catch { }
+        };
+    }
+}