feat(ui): hide list chip outside virtual list views

Task rows now expose a ShowListChip flag that the tasks island sets
only for Virtual list kinds, so the chip stops being redundant when
viewing a single concrete list.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -28,6 +28,7 @@ public sealed partial class TaskRowViewModel : ViewModelBase
     [ObservableProperty] private bool _isExpanded = true;
     [ObservableProperty] private bool _hasPlanningChildren;
     [ObservableProperty] private bool _hasQueuedSubtasks;
+    [ObservableProperty] private bool _showListChip = true;
 
     public DateTime CreatedAt { get; init; }
     public string CreatedAtFormatted => CreatedAt == default ? "—" : $"Created {CreatedAt:MMM d}";

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

@@ -192,8 +192,13 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
                     filteredList.Add(c);
             }
 
+            var showListChip = list.Kind == ListKind.Virtual;
             foreach (var t in filteredList)
-                Items.Add(TaskRowViewModel.FromEntity(t));
+            {
+                var row = TaskRowViewModel.FromEntity(t);
+                row.ShowListChip = showListChip;
+                Items.Add(row);
+            }
 
             // Mark any top-level row that has at least one child as a planning parent,
             // so its subtasks remain expandable even after the parent is queued/running.
@@ -342,6 +347,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
         db.Tasks.Add(entity);
         await db.SaveChangesAsync();
         var row = TaskRowViewModel.FromEntity(entity);
+        row.ShowListChip = _currentList?.Kind == ListKind.Virtual;
         Items.Add(row);
         Regroup();
         NewTaskTitle = "";

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

@@ -141,7 +141,7 @@
             </Button>
 
             <!-- List chip with dot -->
-            <Border Classes="chip chip-list">
+            <Border Classes="chip chip-list" IsVisible="{Binding ShowListChip}">
               <StackPanel Orientation="Horizontal" Spacing="5" VerticalAlignment="Center">
                 <Ellipse Width="6" Height="6"
                          Fill="{DynamicResource MossBrush}"