fix: correct IsBusy aggregation, dispatcher marshaling, and event leaks

- Extract UpdateIsBusy() to check all 6 busy flags consistently and add
  missing SrsReconstructor.IsRebuilding monitoring
- Wrap CreatorViewModel and SrsCreatorViewModel OnProgress handlers in
  Dispatcher.BeginInvoke to prevent cross-thread ObservableCollection access
- Replace anonymous PropertyChanged lambda with named handler in
  SampleRestorerViewModel so old entries can be unsubscribed on reload
- Remove unused CancellationToken parameter from IBruteForceService.RunAsync

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: NeWbY100

ReScene.NET/Services/BruteForceService.cs

@@ -15,7 +15,7 @@ public class BruteForceService : IBruteForceService
 
     private Manager? _manager;
 
-    public async Task<bool> RunAsync(BruteForceOptions options, CancellationToken ct)
+    public async Task<bool> RunAsync(BruteForceOptions options)
     {
         var logger = new ReSceneLogger();
         logger.Logged += (s, e) => LogMessage?.Invoke(s, e);

ReScene.NET/Services/IBruteForceService.cs

@@ -4,7 +4,7 @@ namespace ReScene.NET.Services;
 
 public interface IBruteForceService
 {
-    Task<bool> RunAsync(BruteForceOptions options, CancellationToken ct);
+    Task<bool> RunAsync(BruteForceOptions options);
     void Stop();
     event EventHandler<BruteForceProgressEventArgs>? Progress;
     event EventHandler<BruteForceStatusChangedEventArgs>? StatusChanged;

ReScene.NET/ViewModels/CreatorViewModel.cs

@@ -1,4 +1,5 @@
 using System.Collections.ObjectModel;
+using System.Windows;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using ReScene.NET.Services;
@@ -214,9 +215,12 @@ private void CancelCreation()
 
     private void OnProgress(object? _, SrrCreationProgressEventArgs e)
     {
-        ProgressPercent = e.ProgressPercent;
-        ProgressMessage = e.Message;
-        Log(e.Message);
+        Application.Current.Dispatcher.BeginInvoke(() =>
+        {
+            ProgressPercent = e.ProgressPercent;
+            ProgressMessage = e.Message;
+            Log(e.Message);
+        });
     }
 
     private void Log(string message)

ReScene.NET/ViewModels/MainWindowViewModel.cs

@@ -58,31 +58,37 @@ public MainWindowViewModel(ISrrCreationService srrService, ISrsCreationService s
             if (e.PropertyName == nameof(InspectorViewModel.StatusMessage))
                 StatusMessage = Inspector.StatusMessage;
             else if (e.PropertyName == nameof(InspectorViewModel.IsExporting))
-                IsBusy = Inspector.IsExporting || Creator.IsCreating;
+                UpdateIsBusy();
         };
 
         Creator.PropertyChanged += (_, e) =>
         {
             if (e.PropertyName == nameof(CreatorViewModel.IsCreating))
-                IsBusy = Inspector.IsExporting || Creator.IsCreating || SrsCreator.IsCreating;
+                UpdateIsBusy();
         };
 
         SrsCreator.PropertyChanged += (_, e) =>
         {
             if (e.PropertyName == nameof(SrsCreatorViewModel.IsCreating))
-                IsBusy = Inspector.IsExporting || Creator.IsCreating || SrsCreator.IsCreating || Reconstructor.IsRunning;
+                UpdateIsBusy();
         };
 
         Reconstructor.PropertyChanged += (_, e) =>
         {
             if (e.PropertyName == nameof(ReconstructorViewModel.IsRunning))
-                IsBusy = Inspector.IsExporting || Creator.IsCreating || SrsCreator.IsCreating || Reconstructor.IsRunning || SampleRestorer.IsRestoring;
+                UpdateIsBusy();
+        };
+
+        SrsReconstructor.PropertyChanged += (_, e) =>
+        {
+            if (e.PropertyName == nameof(SrsReconstructorViewModel.IsRebuilding))
+                UpdateIsBusy();
         };
 
         SampleRestorer.PropertyChanged += (_, e) =>
         {
             if (e.PropertyName == nameof(SampleRestorerViewModel.IsRestoring))
-                IsBusy = Inspector.IsExporting || Creator.IsCreating || SrsCreator.IsCreating || Reconstructor.IsRunning || SampleRestorer.IsRestoring;
+                UpdateIsBusy();
         };
     }
 
@@ -110,6 +116,16 @@ public void OpenSceneFile(string filePath)
         Home.LoadRecentFiles();
     }
 
+    private void UpdateIsBusy()
+    {
+        IsBusy = Inspector.IsExporting
+            || Creator.IsCreating
+            || SrsCreator.IsCreating
+            || Reconstructor.IsRunning
+            || SrsReconstructor.IsRebuilding
+            || SampleRestorer.IsRestoring;
+    }
+
     public void Cleanup()
     {
         Inspector.Dispose();

ReScene.NET/ViewModels/ReconstructorViewModel.cs

@@ -757,7 +757,7 @@ private async Task StartAsync()
 
             // Run entirely on a background thread so the UI stays responsive
             // during setup (directory enumeration, input validation, etc.)
-            bool success = await Task.Run(() => _bruteForceService.RunAsync(options, _cts.Token));
+            bool success = await Task.Run(() => _bruteForceService.RunAsync(options));
 
             // Mark final version entry
             if (_activeVersionIndex >= 0 && _activeVersionIndex < VersionEntries.Count)

ReScene.NET/ViewModels/SampleRestorerViewModel.cs

@@ -1,4 +1,5 @@
 using System.Collections.ObjectModel;
+using System.ComponentModel;
 using System.Diagnostics;
 using System.Windows;
 using CommunityToolkit.Mvvm.ComponentModel;
@@ -203,6 +204,8 @@ private void CancelRestore()
 
     private void LoadSrsEntries()
     {
+        foreach (var old in SrsEntries)
+            old.PropertyChanged -= OnEntryPropertyChanged;
         SrsEntries.Clear();
 
         try
@@ -217,7 +220,7 @@ private void LoadSrsEntries()
                     SampleFileName = info.SampleFileName,
                     IsSelected = true
                 };
-                entry.PropertyChanged += (_, _) => RestoreCommand.NotifyCanExecuteChanged();
+                entry.PropertyChanged += OnEntryPropertyChanged;
                 SrsEntries.Add(entry);
             }
 
@@ -268,6 +271,11 @@ partial void OnMediaDirectoryPathChanged(string value)
             MatchMediaFiles();
     }
 
+    private void OnEntryPropertyChanged(object? _, PropertyChangedEventArgs e)
+    {
+        RestoreCommand.NotifyCanExecuteChanged();
+    }
+
     private void OnProgress(object? _, SrsReconstructionProgressEventArgs e)
     {
         Application.Current.Dispatcher.BeginInvoke(() =>

ReScene.NET/ViewModels/SrsCreatorViewModel.cs

@@ -1,4 +1,5 @@
 using System.Collections.ObjectModel;
+using System.Windows;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using ReScene.NET.Services;
@@ -151,8 +152,11 @@ private void CancelCreation()
 
     private void OnProgress(object? _, SrsCreationProgressEventArgs e)
     {
-        ProgressMessage = e.Message;
-        Log(e.Message);
+        Application.Current.Dispatcher.BeginInvoke(() =>
+        {
+            ProgressMessage = e.Message;
+            Log(e.Message);
+        });
     }
 
     private void Log(string message)