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/shared/materials/MaterialOverlay.tsx

@@ -22,6 +22,8 @@ type MaterialOverlayProps = {
   onZoomAt?: (nx: number, ny: number) => void;
   /** Без собственного root/dim — внутри `SceneOverlayHost`. */
   embedded?: boolean;
+  /** Маркеры легенды (норм. координаты картинки). */
+  legendMarkers?: readonly { id: string; number: number; nx: number; ny: number }[];
 };
 
 function RotateIcon() {
@@ -99,6 +101,7 @@ export function MaterialOverlay({
   onLayoutChange,
   onZoomAt,
   embedded = false,
+  legendMarkers,
 }: MaterialOverlayProps) {
   const url = useAssetUrl(assetId);
   const host = useSceneOverlayView();
@@ -381,16 +384,23 @@ export function MaterialOverlay({
         src={url}
         alt=""
         draggable={false}
-        style={{
-          width: w,
-          height: h,
-          transform: 'translate(-50%, -50%)',
-        }}
         onLoad={(e) => {
           const img = e.currentTarget;
           setNatural({ w: img.naturalWidth || 1, h: img.naturalHeight || 1 });
         }}
       />
+      {(legendMarkers ?? []).map((m) => (
+        <div
+          key={m.id}
+          className={styles.legendMarker}
+          style={{
+            left: `${String(m.nx * 100)}%`,
+            top: `${String(m.ny * 100)}%`,
+          }}
+        >
+          {m.number}
+        </div>
+      ))}
       {editable && !zoomTool
         ? (['nw', 'ne', 'sw', 'se'] as const).map((corner) => (
             <button