fix(ui): surface interactive/planning launch errors in footer

src/ClaudeDo.Ui/ViewModels/IslandsShellViewModel.cs

@@ -125,6 +125,17 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         WorkerLogText = null;
     }
 
+    // Surfaces a UI-originated failure in the footer status strip (same line as the
+    // worker log), color-coded as an error and auto-cleared by _clearTimer.
+    public void FlashFooterError(string message)
+    {
+        WorkerLogText = $"{DateTime.Now:HH:mm} · {message}";
+        WorkerLogLevel = WorkerLogLevel.Error;
+        IsWorkerLogVisible = true;
+        _clearTimer.Stop();
+        _clearTimer.Start();
+    }
+
     private void OnPrimeFired(PrimeFiredEvent evt)
     {
         var when = evt.FiredAt.LocalDateTime.ToString("HH:mm");
@@ -181,6 +192,7 @@ public sealed partial class IslandsShellViewModel : ViewModelBase, IDisposable
         Tasks.SelectionChanged += (_, _) => Details.Bind(Tasks.SelectedTask);
         Tasks.NotesRequested += () => Details.ShowNotes();
         Tasks.PrepRequested += () => Details.ShowPrep();
+        Tasks.ErrorReported += FlashFooterError;
         Tasks.TasksChanged     += (_, _) => _ = Lists.RefreshCountsAsync();
         Tasks.OpenListSettingsRequested += (_, _) =>
         {