From 4944de5febf959f53725dfd94c3787b938bf65e6 Mon Sep 17 00:00:00 2001
From: Zac Gaetano <zgaetano@wilddragon.net>
Date: Fri, 15 May 2026 14:33:00 -0400
Subject: [PATCH] feat(wpf): v2 - restore live thumbnail preview column in
 participants table

96x54 thumbnail (16:9) fed from the engine's most recent ProcessedFrame. Em-dash placeholder when no pipeline is running. Same pattern as v1 - lifted Image binding to Thumbnail with HasThumbnail visibility flip. Sits between the state LED and the name+codec caption.
---
 src/TeamsISO.App/MainWindow.xaml | 37 +++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/src/TeamsISO.App/MainWindow.xaml b/src/TeamsISO.App/MainWindow.xaml
index 4aee607..314823f 100644
--- a/src/TeamsISO.App/MainWindow.xaml
+++ b/src/TeamsISO.App/MainWindow.xaml
@@ -494,7 +494,42 @@
                             </DataGridTemplateColumn.CellTemplate>
                         </DataGridTemplateColumn>
 
-                        <!-- Col 2 — Name + caption. Display name (Inter 13/Medium) above,
+                        <!-- Col 2 — Live preview thumbnail. 96×54 (16:9). WriteableBitmap
+                             fed from the engine's most recent ProcessedFrame at the 1Hz
+                             stats tick. Em-dash placeholder when no pipeline is running. -->
+                        <DataGridTemplateColumn Header="Preview" Width="106" IsReadOnly="True">
+                            <DataGridTemplateColumn.CellTemplate>
+                                <DataTemplate>
+                                    <Grid VerticalAlignment="Center" HorizontalAlignment="Left" Margin="0,0,8,0">
+                                        <Border Width="96" Height="54"
+                                                Background="{DynamicResource Wd.SurfaceElevated}"
+                                                BorderBrush="{DynamicResource Wd.Border}"
+                                                BorderThickness="1"
+                                                CornerRadius="4"
+                                                Visibility="{Binding HasThumbnail, Converter={StaticResource BoolToVisInverse}}">
+                                            <TextBlock Text="—"
+                                                       Foreground="{DynamicResource Wd.Text.Tertiary}"
+                                                       FontFamily="{StaticResource Wd.Font.Mono}"
+                                                       FontSize="11"
+                                                       HorizontalAlignment="Center"
+                                                       VerticalAlignment="Center"/>
+                                        </Border>
+                                        <Border Width="96" Height="54"
+                                                BorderBrush="{DynamicResource Wd.Border}"
+                                                BorderThickness="1"
+                                                CornerRadius="4"
+                                                ClipToBounds="True"
+                                                Visibility="{Binding HasThumbnail, Converter={StaticResource BoolToVis}}">
+                                            <Image Source="{Binding Thumbnail}"
+                                                   Stretch="UniformToFill"
+                                                   RenderOptions.BitmapScalingMode="LowQuality"/>
+                                        </Border>
+                                    </Grid>
+                                </DataTemplate>
+                            </DataGridTemplateColumn.CellTemplate>
+                        </DataGridTemplateColumn>
+
+                        <!-- Col 3 — Name + caption. Display name (Inter 13/Medium) above,
                              source machine + state caption (Mono 11/Tertiary) below. -->
                         <DataGridTemplateColumn Header="Participant" Width="*" IsReadOnly="True">
                             <DataGridTemplateColumn.CellTemplate>