feat(ui): the capture context menu is always available (Ctrl+right-click); wordmark "ty" is YouTube red

1. The preview's right-click handler swallowed every right-click for the zoom box, so the
   element/backdrop context menu could not open at all. Sources and capture windows must be
   changeable AT ANY TIME — a creator swaps a window mid-stream without entering edit mode.
   Ctrl + right-click now bypasses the zoom path and lets WPF open the menu under the cursor;
   plain right-click keeps the zoom box. No menu markup changed.

2. The wordmark's "ty" is YouTube red (#ff0000), permanently. The token sweep had recoloured it
   to the interactive blue because it was a bare literal; DESIGN.md now records "never re-colour
   the wordmark" beside the token, and UiShellTests pins it.

Guard: UiShellTests gains the wordmark rule and the Ctrl+right-click chord.

Controls/PreviewPane.xaml.cs

@@ -590,6 +590,12 @@ public partial class PreviewPane : UserControl
 
     private void Preview_MouseRightButtonDown(object sender, MouseButtonEventArgs e)
     {
+        // Ctrl + right-click opens the element / backdrop context menu — sources and windows can
+        // be changed at ANY time, live or not (creator ruling 2026-10-30). Plain right-click stays
+        // with the zoom box, which is why the menu needed its own chord.
+        // Returning without Handled lets WPF's ContextMenuService open the menu under the cursor.
+        if ((Keyboard.Modifiers & ModifierKeys.Control) != 0) return;
+
         var vm = DataContext as MainViewModel;
         if (vm == null) return;
         var grid = (Grid)sender;

Controls/TopBar.xaml

@@ -23,7 +23,9 @@
                     </ControlTemplate>
                 </Button.Template>
                 <TextBlock FontSize="22" FontWeight="Bold" VerticalAlignment="Center">
-                    <Run Text="LlamaCas" Foreground="{StaticResource Brush.OnSurface}"/><Run Text="ty" Foreground="{StaticResource Brush.Tertiary}"/><Run
+                    <Run Text="LlamaCas" Foreground="{StaticResource Brush.OnSurface}"/><!-- Creator ruling (2026-10-30, asked repeatedly): the wordmark's "ty" is YouTube red.
+                             It is brand, not state — do not re-tokenise it to an accent. -->
+                        <Run Text="ty" Foreground="{StaticResource Brush.Youtube}"/><Run
                         x:Name="BuildIdStamp" Text="{x:Static helpers:BuildStamp.Label}" FontSize="9"
                         BaselineAlignment="Superscript" Foreground="{StaticResource Brush.OnSurfaceVariant}"
                         ToolTipService.ToolTip="{x:Static helpers:BuildStamp.Label}"/><Run Text=" " FontSize="4"/>

DESIGN.md

@@ -58,7 +58,7 @@
 | `success-container` | `#1d5c38` | Success notice surface (success toast) |
 | `warning-container` | `#b8860b` | Warning surface — health banner, warning toast |
 | `test-container` | `#9c6f1c` | Test-stream chrome: the gold top bar and glow |
-| `youtube` | `#ff0000` | **YouTube-branded surfaces only** — the Stream Info and YPP rails, the YouTube account row. Not for state: live stays `primary` |
+| `youtube` | `#ff0000` | **YouTube-branded surfaces only** — Stream Info / YPP rails, the YouTube account row, and the wordmark's "ty" (creator ruling: never re-colour it) | — the Stream Info and YPP rails, the YouTube account row. Not for state: live stays `primary` |
 
 **The rule:** red means "live or recording" and nothing else. Never a Send button, a delete action,
 a brand flourish, or a general accent — that was the defect in the first Stitch draft.

ytLive.Tests/UiShellTests.cs

@@ -59,6 +59,19 @@ public class UiShellTests
         Assert.DoesNotContain("MaxHeight", listLine);
     }
 
+    [Fact]
+    public void The_wordmark_ty_stays_youtube_red_and_ctrl_opens_the_context_menu()
+    {
+        var topBar = SourceAssert.Text("Controls", "TopBar.xaml");
+        Assert.Contains("<Run Text=\"ty\" Foreground=\"{StaticResource Brush.Youtube}\"/>", topBar);
+
+        // Plain right-click is the zoom box; the context menu moved to Ctrl+right-click so a
+        // creator can change capture sources mid-stream.
+        var preview = SourceAssert.Text("Controls", "PreviewPane.xaml.cs");
+        Assert.Contains("ModifierKeys.Control", preview);
+        Assert.Contains("return;", preview);
+    }
+
     private static int Count(string haystack, string needle)
     {
         var hits = 0;