fix(ui): dispose VM subscriptions/timers, guard offline Stop, align review delta-path

- DetailsIslandViewModel/TasksIslandViewModel/ListsIslandViewModel: implement
  IDisposable, unsubscribe Loc.LanguageChanged and worker events (memory leaks).
- IslandsShellViewModel: dispose the three System.Timers.Timer instances.
- StopAsync: guard on Task/IsRunning/IsConnected and wrap CancelTask in try/catch.
- TaskMatchesList virtual:review now matches WaitingForReview (aligns with ReviewFilter).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -14,7 +14,7 @@ using TaskStatus = ClaudeDo.Data.Models.TaskStatus;
 
 namespace ClaudeDo.Ui.ViewModels.Islands;
 
-public sealed partial class TasksIslandViewModel : ViewModelBase
+public sealed partial class TasksIslandViewModel : ViewModelBase, IDisposable
 {
     private readonly IDbContextFactory<ClaudeDoDbContext> _dbFactory;
     private readonly IWorkerClient? _worker;
@@ -71,6 +71,8 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
 
     public Func<UnfinishedPlanningModalViewModel, Task>? ShowUnfinishedPlanningModal { get; set; }
 
+    private readonly EventHandler _langChangedHandler;
+
     public TasksIslandViewModel(IDbContextFactory<ClaudeDoDbContext> dbFactory, IWorkerClient? worker = null)
     {
         _dbFactory = dbFactory;
@@ -85,7 +87,13 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
             _worker.RefineStartedEvent     += OnRefineStarted;
             _worker.RefineFinishedEvent    += OnRefineFinished;
         }
-        Loc.LanguageChanged += (_, _) => RefreshLocalizedText();
+        _langChangedHandler = (_, _) => RefreshLocalizedText();
+        Loc.LanguageChanged += _langChangedHandler;
+    }
+
+    public void Dispose()
+    {
+        Loc.LanguageChanged -= _langChangedHandler;
     }
 
     private void RefreshLocalizedText()
@@ -178,7 +186,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
         ListKind.Smart   when list.Id == "smart:my-day"    => t.IsMyDay,
         ListKind.Smart   when list.Id == "smart:important" => t.IsStarred,
         ListKind.Smart   when list.Id == "smart:planned"   => t.ScheduledFor != null,
-        ListKind.Virtual when list.Id == "virtual:review"  => t.Status == TaskStatus.Done && t.Worktree?.State == WorktreeState.Active && t.ParentTaskId == null,
+        ListKind.Virtual when list.Id == "virtual:review"  => t.Status == TaskStatus.WaitingForReview,
         ListKind.User                                       => $"user:{t.ListId}" == list.Id,
         _                                                   => false,
     };