refactor(ui): scope "Let Claude handle it" to a single list

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

@@ -100,18 +100,6 @@ public sealed partial class ListsIslandViewModel : ViewModelBase, IDisposable
             LetClaudeHandleRequested?.Invoke(new MergeHelperRequest(rawId, ids));
     }
 
-    [RelayCommand]
-    private async Task LetClaudeHandleAllAsync()
-    {
-        if (Dialogs is null || _services is null) return;
-        var vm = _services.GetRequiredService<MergeHelperSelectionModalViewModel>();
-        vm.Configure(null, null);
-        await vm.LoadAsync();
-        var ids = await Dialogs.ShowMergeHelperSelectionAsync(vm);
-        if (ids is { Count: > 0 })
-            LetClaudeHandleRequested?.Invoke(new MergeHelperRequest(null, ids));
-    }
-
     [RelayCommand]
     private void OpenInExplorer(ListNavItemViewModel? row)
     {