feat: scene traps, material legends, and scene editor window

Add trap overlays with session state, material legend editor/panel, and a dedicated scene editor window wired through IPC and project persistence.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/editor/MaterialsModals.tsx

@@ -1,7 +1,7 @@
 import React, { useCallback, useEffect, useState } from 'react';
 import { createPortal, flushSync } from 'react-dom';
 
-import type { MaterialId, ProjectMaterial } from '../../shared/types';
+import type { MaterialId, MaterialLegend, ProjectMaterial } from '../../shared/types';
 import { Button, Input } from '../shared/ui/controls';
 import { useAssetUrl } from '../shared/useAssetImageUrl';
 
@@ -81,7 +81,6 @@ export function MaterialEditModal({
     onDropPaths: (paths) => {
       const picked = pickFirstMaterialImagePath(paths);
       if (!picked) return;
-      // Prefer File blob URL if available from the last drop via entries — handled in onDrop below.
       setPreviewFromPathAndUrl(picked, '');
     },
     filterPaths: filterMaterialImagePaths,
@@ -226,6 +225,7 @@ type MaterialsManagerModalProps = {
   onDelete: (materialId: MaterialId) => Promise<void>;
   onReorder: (materialIds: MaterialId[]) => Promise<void>;
   onRotate: (materialId: MaterialId, rotationDeg: 0 | 90 | 180 | 270) => void;
+  onLegendChange?: (materialId: MaterialId, legend: MaterialLegend) => Promise<void>;
 };
 
 export function MaterialsManagerModal({
@@ -237,6 +237,7 @@ export function MaterialsManagerModal({
   onDelete,
   onReorder,
   onRotate,
+  onLegendChange,
 }: MaterialsManagerModalProps) {
   const { t } = useEditorI18n();
   const [selectedId, setSelectedId] = useState<MaterialId | null>(null);
@@ -278,6 +279,7 @@ export function MaterialsManagerModal({
           onDelete={onDelete}
           onReorder={onReorder}
           onRotate={onRotate}
+          onLegendChange={onLegendChange}
         />
       </div>
     </>,