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/MainWindow.xaml

@@ -5,6 +5,8 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:wv2="clr-namespace:Microsoft.Web.WebView2.Wpf;assembly=Microsoft.Web.WebView2.Wpf"
         xmlns:vm="clr-namespace:VideoDownloader.App.ViewModels"
+         xmlns:local="clr-namespace:VideoDownloader.App"
+         xmlns:feat="clr-namespace:VideoDownloader.App.Browser.Features"
         mc:Ignorable="d"
         FontFamily="{StaticResource UiFont}"
         Title="Video Downloader" Height="820" Width="1300"
@@ -153,6 +155,7 @@
 
     <Grid>
         <Grid.RowDefinitions>
+            <RowDefinition Height="Auto"/>
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="*"/>
@@ -186,6 +189,8 @@
                 <StackPanel DockPanel.Dock="Right" Orientation="Horizontal" VerticalAlignment="Center" Margin="10,0,0,0">
                     <Button Name="BookmarksBtn" Style="{StaticResource IconButton}" Content="&#xE734;" ToolTip="즐겨찾기" Margin="0,0,2,0" Click="ToggleBookmarks"/>
                     <Button Name="HistoryBtn" Style="{StaticResource IconButton}" Content="&#xE823;" ToolTip="방문 기록" Margin="0,0,2,0" Click="ToggleHistory"/>
+                    <Button Name="TabSearchBtn" Style="{StaticResource IconButton}" Content="&#xE721;" ToolTip="탭 검색 (Ctrl+Shift+A)" Margin="0,0,2,0" Click="ToggleTabSearch"/>
+                    <Button Name="DownloadsBtn" Style="{StaticResource IconButton}" Content="&#xE896;" ToolTip="다운로드 (Ctrl+J)" Margin="0,0,2,0" Click="ToggleDownloads"/>
                     <Button Style="{StaticResource IconButton}" Content="&#xE8B7;" ToolTip="저장 폴더 열기" Margin="0,0,2,0" Click="OpenFolder_Click"/>
                     <Button Name="LinkBtn" Style="{StaticResource IconButton}" Content="&#xE71B;" ToolTip="링크로 받기 (YouTube·Instagram·X)" Margin="0,0,2,0" Click="ToggleLink"/>
                     <Button x:Name="PrivateBtn" Style="{StaticResource IconButton}" Content="&#xE72E;" ToolTip="개인정보 보호 모드(InPrivate)" Margin="0,0,2,0" Click="TogglePrivate_Click"/>
@@ -210,8 +215,32 @@
             </DockPanel>
         </Border>
 
+        <!-- ===== 북마크바 (T1-6, Ctrl+Shift+B 토글) ===== -->
+        <Border x:Name="BookmarkBar" Grid.Row="1" Background="{StaticResource PanelBg}"
+                BorderBrush="{StaticResource BorderSubtle}" BorderThickness="0,0,0,1" Padding="8,3"
+                Visibility="Collapsed">
+            <ScrollViewer HorizontalScrollBarVisibility="Auto" VerticalScrollBarVisibility="Disabled">
+                <ItemsControl x:Name="BookmarkBarList" ItemsSource="{Binding}">
+                    <ItemsControl.ItemsPanel>
+                        <ItemsPanelTemplate>
+                            <StackPanel Orientation="Horizontal"/>
+                        </ItemsPanelTemplate>
+                    </ItemsControl.ItemsPanel>
+                    <ItemsControl.ItemTemplate>
+                        <DataTemplate>
+                            <Button Style="{StaticResource FlatButton}" Click="BookmarkBar_Click"
+                                    Padding="10,4" Margin="2,1" ToolTip="{Binding Url}">
+                                <TextBlock Text="{Binding Title}" TextTrimming="CharacterEllipsis"
+                                           MaxWidth="130" FontSize="12"/>
+                            </Button>
+                        </DataTemplate>
+                    </ItemsControl.ItemTemplate>
+                </ItemsControl>
+            </ScrollViewer>
+        </Border>
+
         <!-- ===== 탭 스트립 (Phase A) ===== -->
-        <Border x:Name="TabStripRow" Grid.Row="1" Background="{StaticResource PanelBg}"
+        <Border x:Name="TabStripRow" Grid.Row="2" Background="{StaticResource PanelBg}"
                 BorderBrush="{StaticResource BorderSubtle}" BorderThickness="0,0,0,1" Padding="8,4,8,0">
             <DockPanel>
                 <Button x:Name="NewTabBtn" DockPanel.Dock="Right" Style="{StaticResource IconButton}"
@@ -271,7 +300,7 @@
         </Border>
 
         <!-- ===== 본문 ===== -->
-        <Grid Grid.Row="2">
+        <Grid Grid.Row="3">
             <Grid.ColumnDefinitions>
                 <ColumnDefinition Width="*"/>
                 <ColumnDefinition Width="Auto"/>
@@ -381,7 +410,7 @@
         </Grid>
 
         <!-- ===== 상태 표시줄 ===== -->
-        <Border x:Name="StatusBar" Grid.Row="3" Background="{StaticResource PanelBg}"
+        <Border x:Name="StatusBar" Grid.Row="4" Background="{StaticResource PanelBg}"
                 BorderBrush="{StaticResource BorderSubtle}" BorderThickness="0,1,0,0" Padding="16,5">
             <TextBlock Name="StatusText" Foreground="{StaticResource TextMuted}" FontSize="11"
                        TextTrimming="CharacterEllipsis" Text="준비"/>
@@ -473,6 +502,87 @@
             </Border>
         </Popup>
 
+        <!-- ===== 다운로드 플라이아웃 (T1-5) ===== -->
+        <Popup Name="DownloadsPopup" PlacementTarget="{Binding ElementName=DownloadsBtn}"
+               Placement="Bottom" HorizontalOffset="-10" VerticalOffset="6"
+               StaysOpen="False" AllowsTransparency="True" PopupAnimation="Fade">
+            <Border Background="{StaticResource CardBg}" BorderBrush="{StaticResource BorderBrush}"
+                    BorderThickness="1" CornerRadius="12" Padding="10" Width="420" MaxHeight="460">
+                <StackPanel>
+                    <DockPanel Margin="6,2,6,8">
+                        <TextBlock Text="다운로드" Foreground="{StaticResource TextPrimary}" FontWeight="SemiBold" VerticalAlignment="Center"/>
+                        <Button DockPanel.Dock="Right" Style="{StaticResource CardActionButton}" Content="완료 항목 지우기"
+                                Click="DownloadsClear_Click" HorizontalAlignment="Right"/>
+                    </DockPanel>
+                    <ScrollViewer VerticalScrollBarVisibility="Auto" MaxHeight="380">
+                        <ItemsControl Name="DownloadsList">
+                            <ItemsControl.ItemTemplate>
+                                <DataTemplate>
+                                    <Border Background="{StaticResource GlassBg}" BorderBrush="{StaticResource BorderSubtle}"
+                                            BorderThickness="1" CornerRadius="8" Padding="10" Margin="0,0,0,8">
+                                        <StackPanel>
+                                            <DockPanel>
+                                                <TextBlock DockPanel.Dock="Right" Text="{Binding SpeedText}" Foreground="{StaticResource TextMuted}"
+                                                           FontSize="11" VerticalAlignment="Center" Margin="8,0,0,0"/>
+                                                <TextBlock Text="{Binding FileName}" Foreground="{StaticResource TextPrimary}"
+                                                           FontSize="12.5" FontWeight="Medium" TextTrimming="CharacterEllipsis"/>
+                                            </DockPanel>
+                                            <ProgressBar Value="{Binding Percent}" Maximum="100" Height="6" Margin="0,7,0,6"
+                                                         Style="{StaticResource AccentProgressBar}"/>
+                                            <DockPanel>
+                                                <TextBlock Text="{Binding State}" Foreground="{StaticResource TextSecondary}" FontSize="11" VerticalAlignment="Center"/>
+                                                <StackPanel DockPanel.Dock="Right" Orientation="Horizontal">
+                                                    <Button Style="{StaticResource CardActionButton}" Content="일시정지" Click="DlPause_Click" Margin="0,0,5,0"/>
+                                                    <Button Style="{StaticResource CardActionButton}" Content="재개" Click="DlResume_Click" Margin="0,0,5,0"/>
+                                                    <Button Style="{StaticResource CardActionButton}" Content="취소" Click="DlCancel_Click"/>
+                                                </StackPanel>
+                                            </DockPanel>
+                                        </StackPanel>
+                                    </Border>
+                                </DataTemplate>
+                            </ItemsControl.ItemTemplate>
+                        </ItemsControl>
+                    </ScrollViewer>
+                    <TextBlock Text="페이지 내 파일 다운로드가 여기 표시됩니다" Foreground="{StaticResource TextMuted}"
+                               FontSize="11" HorizontalAlignment="Center" Margin="0,4,0,0"
+                               x:Name="DownloadsEmptyHint"/>
+                </StackPanel>
+            </Border>
+        </Popup>
+
+        <!-- ===== 탭 검색 팝업 (T2-8, Ctrl+Shift+A) ===== -->
+        <Popup Name="TabSearchPopup" PlacementTarget="{Binding ElementName=AddressBox}"
+               Placement="Center" StaysOpen="False" AllowsTransparency="True" PopupAnimation="Fade"
+               Width="520">
+            <Border Background="{StaticResource CardBg}" BorderBrush="{StaticResource BorderBrush}"
+                    BorderThickness="1" CornerRadius="12" Padding="10">
+                <StackPanel>
+                    <Border Background="{StaticResource GlassBg}" BorderBrush="{StaticResource BorderBrush}"
+                            BorderThickness="1" CornerRadius="8" Margin="2,0,2,8">
+                        <TextBox Name="TabSearchBox" Style="{StaticResource DarkTextBox}" BorderThickness="0"
+                                 Background="Transparent" Padding="12,9" FontSize="13"
+                                 TextChanged="TabSearchBox_TextChanged" PreviewKeyDown="TabSearchBox_PreviewKeyDown"/>
+                    </Border>
+                    <ListBox Name="TabSearchResults" Style="{StaticResource SuggestList}"
+                             ItemContainerStyle="{StaticResource SuggestItem}" MaxHeight="320"
+                             PreviewMouseLeftButtonUp="TabSearchResult_Click">
+                        <ListBox.ItemTemplate>
+                            <DataTemplate>
+                                <StackPanel>
+                                    <DockPanel>
+                                        <TextBlock DockPanel.Dock="Right" Text="{Binding IsClosed, Converter={x:Static feat:BoolToClosedConverter.Instance}}"
+                                                   Foreground="{StaticResource TextMuted}" FontSize="10.5" VerticalAlignment="Center"/>
+                                        <TextBlock Text="{Binding Title}" TextTrimming="CharacterEllipsis" FontSize="12.5" FontWeight="Medium"/>
+                                    </DockPanel>
+                                    <TextBlock Text="{Binding Url}" Foreground="{StaticResource TextMuted}" FontSize="10.5" TextTrimming="CharacterEllipsis"/>
+                                </StackPanel>
+                            </DataTemplate>
+                        </ListBox.ItemTemplate>
+                    </ListBox>
+                </StackPanel>
+            </Border>
+        </Popup>
+
         <!-- ===== 링크로 받기 플라이아웃 (YouTube/Instagram/X URL 붙여넣기) ===== -->
         <Popup Name="LinkPopup" PlacementTarget="{Binding ElementName=LinkBtn}"
                Placement="Bottom" HorizontalOffset="-10" VerticalOffset="6"