feat(ui): the creator's six corrections

1. Stream Info + YPP rails are YouTube surfaces → new `youtube` token #ff0000. It is documented
   as brand-only: live state stays `primary`, so the two reds never mean the same thing.
2. EDIT toggle: the checked trigger set the SAME colour as the resting face, so clicking it
   changed nothing visible. Resting is now the neutral surface with muted text; armed is blue with
   dark text, and the label follows the fill.
3. Active scene outline is orange again (`attention`) — it marks the scene you work on, not a
   selection; blue made it read as "selected". Live stays red.
4. Scene names wear the same pill as the hotkey chips (black, 10px radius, 8×2 padding), so both
   labels stay readable over any thumbnail.
5. REC / ON-AIR pills and the running stop button read red while armed/live — including test
   mode, where the top bar is gold. New `RecordPillToggle` style (its own template, because
   SegmentToggle hard-codes a transparent face); the stop button's grey `#333` literal is gone.
6. The properties list had `MaxHeight="420"` inside an Auto row, so it scrolled while the window
   had space left. The row is `*` now and the cap is gone.

Guard: UiShellTests pins all six to the markup and names the one that regresses.

Controls/SceneThumbnailStrip.xaml

@@ -18,8 +18,12 @@
                             <Style TargetType="Border">
                                 <Setter Property="BorderBrush" Value="{StaticResource Brush.Outline}"/>
                                 <Style.Triggers>
+                                    <!-- Active scene = orange (creator ruling 2026-10-30): it marks
+                                         the stage you are working on, not a selection — blue is
+                                         the interactive accent and read as "selected". Live
+                                         stays red. -->
                                     <DataTrigger Binding="{Binding IsStaged}" Value="True">
-                                        <Setter Property="BorderBrush" Value="{StaticResource Brush.Tertiary}"/>
+                                        <Setter Property="BorderBrush" Value="{StaticResource Brush.Attention}"/>
                                     </DataTrigger>
                                     <DataTrigger Binding="{Binding IsLive}" Value="True">
                                         <Setter Property="BorderBrush" Value="{StaticResource Brush.Primary}"/>
@@ -67,13 +71,13 @@
                                 <TextBlock Text="{Binding HotkeyLabel, Mode=OneWay}" Foreground="White" FontSize="16" FontWeight="SemiBold"/>
                             </Border>
 
-                            <TextBlock Text="{Binding Name, Mode=OneWay}" Foreground="White" FontSize="16" FontWeight="SemiBold"
-                                       HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="6"
-                                       TextTrimming="CharacterEllipsis">
-                                <TextBlock.Effect>
-                                    <DropShadowEffect BlurRadius="4" ShadowDepth="0" Opacity="0.9"/>
-                                </TextBlock.Effect>
-                            </TextBlock>
+                            <!-- The scene name wears the same pill as the hotkey chip, so both
+                                 labels stay readable over any thumbnail. -->
+                            <Border HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="6"
+                                    Padding="8,2" CornerRadius="10" Background="#000000">
+                                <TextBlock Text="{Binding Name, Mode=OneWay}" Foreground="White" FontSize="15" FontWeight="SemiBold"
+                                           TextTrimming="CharacterEllipsis"/>
+                            </Border>
                         </Grid>
                     </Border>
                 </DataTemplate>