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)

ViewModels/MainViewModel.cs

@@ -103,6 +103,7 @@ public class MainViewModel : ViewModelBase
     public ObservableCollection<Scene> Scenes { get; } = new();
     public ObservableCollection<ChatMessage> ChatMessages { get; } = new();
     public ObservableCollection<DisplayInfo> Displays { get; } = new();
+    public ObservableCollection<SourceMenuItem> AddSourceMenuItems { get; } = new();
     public string[] Visibilities { get; } = { "Public", "Unlisted", "Private" };
 
     public Scene? ActiveScene
@@ -123,6 +124,7 @@ public class MainViewModel : ViewModelBase
                 OnPropertyChanged(nameof(CanShowWebcamInActiveScene));
                 UpdateActiveBackground();
                 UpdateBackdropImage();
+                RebuildAddSourceMenu();
             }
         }
     }
@@ -1189,6 +1191,7 @@ public class MainViewModel : ViewModelBase
             foreach (SceneElement element in e.OldItems)
                 element.PropertyChanged -= OnElementPropertyChanged;
         OnPropertyChanged(nameof(CanAddWebcamToActiveScene));
+        RebuildAddSourceMenu();
         ScheduleSave();
     }
 
@@ -1245,6 +1248,34 @@ public class MainViewModel : ViewModelBase
             ActiveScene = Scenes.FirstOrDefault();
     }
 
+    // The Add-Source menu lists only what the active scene allows per the access
+    // matrix (SceneAccessPolicy). The webcam row is always present (webcams are
+    // allowed in every scene) but greys out once the active scene has one.
+    private void RebuildAddSourceMenu()
+    {
+        AddSourceMenuItems.Clear();
+        var sceneName = ActiveScene?.Name;
+        if (sceneName == null) return;
+
+        AddSourceMenuItems.Add(new SourceMenuItem(
+            "Webcam", AddWebcamCommand,
+            isEnabled: CanAddWebcamToActiveScene,
+            toolTip: "One webcam at a time — it's already in your stream"));
+
+        var menu = new[]
+        {
+            (Header: "Screen", Type: SourceType.DisplayCapture, Command: AddSourceCommand),
+            (Header: "Background", Type: SourceType.Background, Command: AddSourceCommand),
+            (Header: "Image", Type: SourceType.Image, Command: AddImageCommand),
+            (Header: "Text", Type: SourceType.TextOverlay, Command: AddSourceCommand),
+        };
+        foreach (var (header, type, command) in menu)
+        {
+            if (SceneAccessPolicy.Allows(sceneName, type))
+                AddSourceMenuItems.Add(new SourceMenuItem(header, command, type));
+        }
+    }
+
     private void AddSource(object? parameter)
     {
         var scene = ActiveScene;