feat(mission-control): show running Worker operations in a Running now section

Registry of active verify/merge/rebase/worktree-creation operations in the Worker,
GetActiveOperations snapshot + OperationStarted/OperationEnded hub events, and a
Running now section in Mission Control with ticking elapsed time.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/ClaudeDo.Ui/Views/MissionControl/MissionControlView.axaml

@@ -185,7 +185,7 @@
       </Panel>
 
       <GridSplitter x:Name="QueueSplitter" Grid.Column="1"
-                    IsVisible="{Binding HasQueued}"
+                    IsVisible="{Binding HasActivity}"
                     Width="6"
                     Background="Transparent"
                     HorizontalAlignment="Stretch" VerticalAlignment="Stretch"
@@ -194,12 +194,49 @@
 
       <!-- Read-only queue strip — collapses when nothing is queued -->
       <Border Grid.Column="2"
-              IsVisible="{Binding HasQueued}"
+              IsVisible="{Binding HasActivity}"
               Background="{DynamicResource DeepBrush}"
               BorderBrush="{DynamicResource LineBrush}"
               BorderThickness="1,0,0,0">
         <DockPanel LastChildFill="True" Margin="10,10">
+          <!-- Worker operations running right now; hidden when nothing runs. -->
+          <StackPanel DockPanel.Dock="Top" Margin="0,0,0,12" Spacing="4"
+                      IsVisible="{Binding HasRunningOperations}">
+            <TextBlock Classes="eyebrow"
+                       Text="{loc:Tr missionControl.runningNow}"
+                       Foreground="{DynamicResource TextMuteBrush}"
+                       LetterSpacing="1.4" Margin="0,0,0,4" />
+            <ItemsControl ItemsSource="{Binding RunningOperations}">
+              <ItemsControl.ItemTemplate>
+                <DataTemplate x:DataType="vm:RunningOperationViewModel">
+                  <Panel Margin="0,0,0,4">
+                    <Border Background="{DynamicResource SurfaceBrush}"
+                            BorderBrush="{DynamicResource LineBrush}"
+                            BorderThickness="1" CornerRadius="6" />
+                    <Border Background="{DynamicResource RunningTintBrush}"
+                            BorderBrush="{DynamicResource RunningTintBorderBrush}"
+                            BorderThickness="1" CornerRadius="6" />
+                    <StackPanel Margin="8,6" Spacing="2">
+                      <TextBlock Text="{Binding Subject}"
+                                 TextTrimming="CharacterEllipsis"
+                                 ToolTip.Tip="{Binding Subject}"
+                                 Foreground="{DynamicResource TextDimBrush}" />
+                      <Grid ColumnDefinitions="*,Auto">
+                        <TextBlock Grid.Column="0" Classes="meta"
+                                   Text="{Binding KindLabel}"
+                                   Foreground="{DynamicResource StatusRunningBrush}" />
+                        <TextBlock Grid.Column="1" Classes="meta"
+                                   Text="{Binding Elapsed}"
+                                   Foreground="{DynamicResource TextMuteBrush}" />
+                      </Grid>
+                    </StackPanel>
+                  </Panel>
+                </DataTemplate>
+              </ItemsControl.ItemTemplate>
+            </ItemsControl>
+          </StackPanel>
           <TextBlock DockPanel.Dock="Top" Classes="eyebrow"
+                     IsVisible="{Binding HasQueued}"
                      Text="{loc:Tr missionControl.activity}"
                      Foreground="{DynamicResource TextMuteBrush}"
                      LetterSpacing="1.4" Margin="0,0,0,8" />

src/ClaudeDo.Ui/Views/MissionControl/MissionControlView.axaml.cs

@@ -40,6 +40,24 @@ public partial class MissionControlView : UserControl
         OverviewGrid.AddHandler(PointerReleasedEvent, OnTilePointerReleased);
     }
 
+    // Ticks the "Running now" elapsed times while the view is on screen.
+    private Avalonia.Threading.DispatcherTimer? _elapsedTimer;
+
+    protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
+    {
+        base.OnAttachedToVisualTree(e);
+        _elapsedTimer = new Avalonia.Threading.DispatcherTimer { Interval = TimeSpan.FromSeconds(1) };
+        _elapsedTimer.Tick += (_, _) => _vm?.TickOperations();
+        _elapsedTimer.Start();
+    }
+
+    protected override void OnDetachedFromVisualTree(VisualTreeAttachmentEventArgs e)
+    {
+        _elapsedTimer?.Stop();
+        _elapsedTimer = null;
+        base.OnDetachedFromVisualTree(e);
+    }
+
     private const double DragThreshold = 4;
 
     /// <summary>Tile presenter whose header was pressed; null when no tile drag is pending.</summary>
@@ -199,7 +217,7 @@ public partial class MissionControlView : UserControl
     {
         if (e.PropertyName == nameof(MissionControlViewModel.ColumnCount))
             RebuildOverviewGrid();
-        else if (e.PropertyName == nameof(MissionControlViewModel.HasQueued))
+        else if (e.PropertyName == nameof(MissionControlViewModel.HasActivity))
             UpdateQueueColumn();
         else if (e.PropertyName == nameof(MissionControlViewModel.IsFocusMode))
             // The now-visible layout's hosts must re-steal their pane views from the hidden
@@ -221,7 +239,7 @@ public partial class MissionControlView : UserControl
     private void UpdateQueueColumn()
     {
         var queueColumn = BodyGrid.ColumnDefinitions[2];
-        if (_vm?.HasQueued == true)
+        if (_vm?.HasActivity == true)
         {
             queueColumn.MinWidth = MinQueueWidth;
             queueColumn.Width = _queueWidth;