refactor(ui): remove pick-up-in-terminal, keep ConPTY as the single session entry

Two context-menu entries opened a Claude session for the same task via different
mechanisms (embedded ConPTY vs. an external wt terminal). Drop the external-terminal
path entirely, including its worker hub method, launcher plumbing, and localization
keys, since the embedded ConPTY session already covers every case it did.

src/ClaudeDo.Ui/ViewModels/Islands/TaskRowViewModel.cs

@@ -74,11 +74,6 @@ public sealed partial class TaskRowViewModel : ViewModelBase
                                           && !IsManual;
     public bool CanResumeOrDiscardPlanning => PlanningPhase == PlanningPhase.Active;
 
-    // Pick up in a terminal only where a session + worktree reliably still exist: a task
-    // parked for review, or one that failed mid-run. The worker validates and reports a
-    // clear error if there's no resumable session/worktree.
-    public bool CanPickUpInTerminal => Status is TaskStatus.WaitingForReview or TaskStatus.Failed;
-
     public string? PlanningBadge => PlanningPhase switch
     {
         PlanningPhase.Active    => Loc.T("vm.planningBadge.active"),
@@ -177,7 +172,6 @@ public sealed partial class TaskRowViewModel : ViewModelBase
         OnPropertyChanged(nameof(ShowStatusChip));
         OnPropertyChanged(nameof(IsRunning));
         OnPropertyChanged(nameof(IsWaitingForReview));
-        OnPropertyChanged(nameof(CanPickUpInTerminal));
         OnPropertyChanged(nameof(IsParked));
         OnPropertyChanged(nameof(IsQueued));
         OnPropertyChanged(nameof(IsWaiting));