Source access enforcement (the catalog): 10-source catalog + per-scene access matrix enforced by SceneAccessPolicy; Add-Source menu is one ItemsSource rebuilt per scene (Screen = Live-only, BG/Image/Text every scene), webcam row always present + greys out; Chatbox/Alerts/Socials are inert SourceType rows ready for their features; Text queued as a ship step (countdown + credits modes); Monetization notes socialBar free = YouTube + 1, unlimited with the paid key (79 tests passing)

MainWindow.xaml

@@ -4,7 +4,6 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:vm="clr-namespace:ytLive.ViewModels"
-        xmlns:models="clr-namespace:ytLive.Models"
         xmlns:Helpers="clr-namespace:ytLive.Helpers"
         mc:Ignorable="d"
         Title="{Binding WindowTitle}" Height="720" Width="1280"
@@ -257,14 +256,17 @@
                         <Button ToolTip="Add Source" Style="{StaticResource IconButton}" Margin="4,-4,0,0"
                                 Click="AddSourceButton_Click">
                             <Button.ContextMenu>
-                                <ContextMenu DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}">
-                                    <MenuItem Header="Webcam" Command="{Binding AddWebcamCommand}"
-                                              IsEnabled="{Binding CanAddWebcamToActiveScene}"
-                                              ToolTip="One webcam at a time — it's already in your stream"/>
-                                    <MenuItem Header="Screen" Command="{Binding AddSourceCommand}" CommandParameter="{x:Static models:SourceType.DisplayCapture}"/>
-                                    <MenuItem Header="Background" Command="{Binding AddSourceCommand}" CommandParameter="{x:Static models:SourceType.Background}"/>
-                                    <MenuItem Header="Image" Command="{Binding AddImageCommand}"/>
-                                    <MenuItem Header="Text" Command="{Binding AddSourceCommand}" CommandParameter="{x:Static models:SourceType.TextOverlay}"/>
+                                <ContextMenu ItemsSource="{Binding AddSourceMenuItems}"
+                                             DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}">
+                                    <ContextMenu.ItemContainerStyle>
+                                        <Style TargetType="MenuItem">
+                                            <Setter Property="Header" Value="{Binding Header}"/>
+                                            <Setter Property="Command" Value="{Binding Command}"/>
+                                            <Setter Property="CommandParameter" Value="{Binding Parameter}"/>
+                                            <Setter Property="IsEnabled" Value="{Binding IsEnabled}"/>
+                                            <Setter Property="ToolTip" Value="{Binding ToolTip}"/>
+                                        </Style>
+                                    </ContextMenu.ItemContainerStyle>
                                 </ContextMenu>
                             </Button.ContextMenu>
                             <Path Data="M12,4 L12,20 M4,12 L20,12" Stroke="#e94560" StrokeThickness="2"