feat(interactive): host task-based ConPTY sessions in Command Center

Adds an 'Open ConPTY session' entry that fetches a task's launch spec and hosts
an embedded ConPTY terminal as a Mission Control pane, coexisting with the
streamed-log monitor panes (streaming stack untouched). Introduces IMissionControlPane
+ ConPtyPaneViewModel, a non-destructive Panes mirror (Monitors prefix + ConPtySessions
suffix) so unrelated monitor churn never tears down a live terminal, and a grid<->tabs
layout toggle. Launch failures surface via the footer error strip.

src/ClaudeDo.Ui/Views/Islands/TaskRowView.axaml

@@ -51,6 +51,8 @@
             <Separator/>
             <MenuItem Header="{loc:Tr tasks.ctxRunInteractively}"
                       Click="OnRunInteractivelyClick"/>
+            <MenuItem Header="{loc:Tr tasks.ctxOpenConPtySession}"
+                      Click="OnOpenConPtySessionClick"/>
             <MenuItem Header="{loc:Tr tasks.ctxPickUpInTerminal}"
                       Click="OnPickUpInTerminalClick"
                       IsVisible="{Binding CanPickUpInTerminal}"/>

src/ClaudeDo.Ui/Views/Islands/TaskRowView.axaml.cs

@@ -67,6 +67,12 @@ public partial class TaskRowView : UserControl
             await vm.RunInteractivelyCommand.ExecuteAsync(row);
     }
 
+    private void OnOpenConPtySessionClick(object? sender, RoutedEventArgs e)
+    {
+        if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)
+            vm.OpenConPtySessionCommand.Execute(row);
+    }
+
     private async void OnPickUpInTerminalClick(object? sender, RoutedEventArgs e)
     {
         if (DataContext is TaskRowViewModel row && FindTasksVm() is { } vm)

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

@@ -0,0 +1,47 @@
+<UserControl xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:vm="using:ClaudeDo.Ui.ViewModels.MissionControl"
+             xmlns:views="using:ClaudeDo.Ui.Views"
+             xmlns:loc="using:ClaudeDo.Ui.Localization"
+             xmlns:conv="using:Avalonia.Data.Converters"
+             x:DataType="vm:ConPtyPaneViewModel"
+             x:Class="ClaudeDo.Ui.Views.MissionControl.ConPtyPaneView">
+  <Border Classes="monitor-pane" BorderThickness="1" CornerRadius="10" ClipToBounds="True">
+    <DockPanel LastChildFill="True">
+
+      <!-- Header: title + close -->
+      <Border DockPanel.Dock="Top"
+              Background="{DynamicResource Surface2Brush}"
+              BorderBrush="{DynamicResource LineBrush}"
+              BorderThickness="0,0,0,1" Padding="8,3">
+        <Grid ColumnDefinitions="*,Auto">
+          <TextBlock Grid.Column="0" Classes="meta" Text="{Binding DisplayTitle}"
+                     TextTrimming="CharacterEllipsis"
+                     ToolTip.Tip="{Binding DisplayTitle}"
+                     Foreground="{DynamicResource TextDimBrush}"
+                     VerticalAlignment="Center" Margin="4,0,0,0" />
+          <Button Grid.Column="1" Classes="title-ctrl"
+                  Command="{Binding CloseCommand}"
+                  ToolTip.Tip="{loc:Tr missionControl.closeSession}">
+            <PathIcon Data="{StaticResource Icon.WinClose}" Width="12" Height="12"/>
+          </Button>
+        </Grid>
+      </Border>
+
+      <!-- Start-failure banner -->
+      <Border DockPanel.Dock="Top"
+              IsVisible="{Binding Terminal.StartError, Converter={x:Static conv:ObjectConverters.IsNotNull}}"
+              Background="{DynamicResource ErrorTintBrush}"
+              BorderBrush="{DynamicResource BloodBrush}"
+              BorderThickness="0,0,0,1" Padding="12,6">
+        <TextBlock Classes="meta" Text="{Binding Terminal.StartError}"
+                   Foreground="{DynamicResource BloodBrush}"
+                   TextWrapping="Wrap" />
+      </Border>
+
+      <!-- Embedded ConPTY terminal -->
+      <views:InteractiveTerminalView DataContext="{Binding Terminal}" />
+
+    </DockPanel>
+  </Border>
+</UserControl>

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

@@ -0,0 +1,8 @@
+using Avalonia.Controls;
+
+namespace ClaudeDo.Ui.Views.MissionControl;
+
+public partial class ConPtyPaneView : UserControl
+{
+    public ConPtyPaneView() => InitializeComponent();
+}

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

@@ -2,10 +2,21 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:vm="using:ClaudeDo.Ui.ViewModels"
              xmlns:vmi="using:ClaudeDo.Ui.ViewModels.Islands"
+             xmlns:vmm="using:ClaudeDo.Ui.ViewModels.MissionControl"
              xmlns:mc="using:ClaudeDo.Ui.Views.MissionControl"
              xmlns:loc="using:ClaudeDo.Ui.Localization"
              x:DataType="vm:MissionControlViewModel"
              x:Class="ClaudeDo.Ui.Views.MissionControl.MissionControlView">
+  <UserControl.DataTemplates>
+    <!-- Polymorphic pane templates: both the grid ItemsControl and the focus-mode TabControl
+         resolve per-item content through these (no explicit ItemTemplate on either). -->
+    <DataTemplate DataType="vmi:TaskMonitorViewModel">
+      <mc:MonitorPaneView Margin="6" />
+    </DataTemplate>
+    <DataTemplate DataType="vmm:ConPtyPaneViewModel">
+      <mc:ConPtyPaneView Margin="6" />
+    </DataTemplate>
+  </UserControl.DataTemplates>
   <DockPanel LastChildFill="True" Background="{DynamicResource VoidBrush}"
              DragDrop.AllowDrop="True">
 
@@ -21,6 +32,12 @@
                    LetterSpacing="1.4" VerticalAlignment="Center" />
         <StackPanel Grid.Column="1" Orientation="Horizontal" Spacing="8"
                     VerticalAlignment="Center">
+          <Button Classes="icon-btn"
+                  Command="{Binding ToggleLayoutCommand}"
+                  ToolTip.Tip="{Binding LayoutToggleLabel}">
+            <PathIcon Data="{StaticResource Icon.Grid}" Width="15" Height="15"
+                      Foreground="{DynamicResource TextMuteBrush}"/>
+          </Button>
           <Button Classes="icon-btn"
                   Command="{Binding OpenSettingsCommand}"
                   ToolTip.Tip="{loc:Tr missionControl.settings}">
@@ -72,22 +89,29 @@
       </DockPanel>
     </Border>
 
-    <!-- Grid / empty state -->
+    <!-- Grid / tabs / empty state -->
     <Panel Margin="6">
-      <ItemsControl ItemsSource="{Binding Monitors}" IsVisible="{Binding HasMonitors}">
+      <!-- Overview mode: the existing UniformGrid, one tile per pane -->
+      <ItemsControl ItemsSource="{Binding Panes}" IsVisible="{Binding !IsFocusMode}">
         <ItemsControl.ItemsPanel>
           <ItemsPanelTemplate>
             <UniformGrid x:CompileBindings="False" Columns="{Binding ColumnCount}" />
           </ItemsPanelTemplate>
         </ItemsControl.ItemsPanel>
-        <ItemsControl.ItemTemplate>
-          <DataTemplate x:DataType="vmi:TaskMonitorViewModel">
-            <mc:MonitorPaneView Margin="6" />
-          </DataTemplate>
-        </ItemsControl.ItemTemplate>
       </ItemsControl>
 
-      <TextBlock IsVisible="{Binding !HasMonitors}"
+      <!-- Focus mode: one pane large, switched via tabs -->
+      <TabControl ItemsSource="{Binding Panes}"
+                  SelectedItem="{Binding FocusedPane}"
+                  IsVisible="{Binding IsFocusMode}">
+        <TabControl.ItemTemplate>
+          <DataTemplate x:DataType="vmm:IMissionControlPane">
+            <TextBlock Text="{Binding DisplayTitle}" TextTrimming="CharacterEllipsis" MaxWidth="160" />
+          </DataTemplate>
+        </TabControl.ItemTemplate>
+      </TabControl>
+
+      <TextBlock IsVisible="{Binding !HasPanes}"
                  Text="{loc:Tr missionControl.empty}"
                  Foreground="{DynamicResource TextMuteBrush}"
                  HorizontalAlignment="Center" VerticalAlignment="Center" />