fix(ui): close interactive-session gate bypasses in reset-and-retry and plan queueing

Reset & Retry discarded the branch and queued an autonomous run even while the
user had an interactive ConPTY pane open on the task, and finalizing a plan
queued every child unconditionally (the hub has no notion of a UI-hosted
session) — both bypassed the HasInteractiveSession gate added for
CanSendToQueue. CanResetAndRetry now checks it too, with a subscription on the
bound task so the command re-evaluates when the flag flips without Task
itself changing; SendToQueueAsync now blocks queuing the whole plan and
surfaces the affected child titles when any child has an open session.

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

@@ -837,6 +837,19 @@ public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
         // A finalized planning parent queues its plan (children sequentially), not itself.
         if (row.CanQueuePlan)
         {
+            // The hub's QueuePlanningSubtasksAsync queues every Idle child unconditionally — it has
+            // no notion of a UI-hosted ConPTY session. Block the whole plan if any child has one open,
+            // otherwise that child's worktree would get an autonomous run racing the user's own edits.
+            var interactiveChildren = Items
+                .Where(r => r.ParentTaskId == row.Id && r.HasInteractiveSession)
+                .Select(r => r.Title)
+                .ToList();
+            if (interactiveChildren.Count > 0)
+            {
+                ErrorReported?.Invoke(Loc.T(
+                    "vm.tasksIsland.queuePlanBlockedInteractive", string.Join(", ", interactiveChildren)));
+                return;
+            }
             await QueuePlanningSubtasksAsync(row);
             return;
         }