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/ViewModels/IslandsShellViewModel.cs

@@ -215,6 +215,7 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         MissionControl.OpenInApp = id => _ = RevealTaskAsync(id);
         MissionControl.ShowDetached = (monitor, reDock) => Dialogs?.ShowDetachedMonitor(monitor, reDock);
         MissionControl.OpenSettingsRequested = () => Lists.OpenSettingsCommand.Execute(null);
+        MissionControl.ErrorReported += FlashFooterError;
         _updateCheck = updateCheck;
         _installerLocator = installerLocator;
         _workerLocator = workerLocator;
@@ -228,6 +229,11 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         Tasks.NotesRequested += () => Details.ShowNotes();
         Tasks.PrepRequested += () => Details.ShowPrep();
         Tasks.ErrorReported += FlashFooterError;
+        Tasks.OpenConPtySessionRequested += taskId =>
+        {
+            OpenMissionControl();
+            _ = MissionControl.OpenConPtySessionAsync(taskId);
+        };
         Tasks.TasksChanged     += (_, _) => _ = Lists.RefreshCountsAsync();
         Tasks.OpenListSettingsRequested += (_, _) =>
         {