vibecoded inspector

NResUI/Models/MeshViewportViewModel.cs

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+using NResUI.Rendering.Inspection;
+
+namespace NResUI.Models;
+
+/// <summary>
+/// Общее состояние mesh viewport и inspector.
+/// Панели синхронизируются через эту модель, чтобы выбор piece/batch не жил отдельно в каждом окне.
+/// </summary>
+public sealed class MeshViewportViewModel
+{
+    public MeshDocument? Document { get; private set; }
+    public MeshRenderState RenderState { get; } = new();
+    public string? LoadError { get; private set; }
+    public bool NeedsSceneRebuild { get; private set; }
+
+    public bool HasDocument => Document != null;
+
+    /// <summary>Заменяет текущий документ и сбрасывает все viewport-only overrides.</summary>
+    public void SetDocument(MeshDocument document)
+    {
+        Document = document;
+        LoadError = null;
+        RenderState.HiddenPieceIds.Clear();
+        RenderState.ClearAllPieceOverrides();
+        RenderState.ClearSelection();
+        NeedsSceneRebuild = true;
+    }
+
+    public void SetError(string error)
+    {
+        Document = null;
+        LoadError = error;
+        RenderState.HiddenPieceIds.Clear();
+        RenderState.ClearAllPieceOverrides();
+        RenderState.ClearSelection();
+        NeedsSceneRebuild = true;
+    }
+
+    public void ClearDocument()
+    {
+        Document = null;
+        LoadError = null;
+        RenderState.HiddenPieceIds.Clear();
+        RenderState.ClearAllPieceOverrides();
+        RenderState.ClearSelection();
+        NeedsSceneRebuild = true;
+    }
+
+    public void MarkSceneRebuildNeeded()
+    {
+        NeedsSceneRebuild = true;
+    }
+
+    public void MarkSceneRebuilt()
+    {
+        NeedsSceneRebuild = false;
+    }
+}