feat: multi-material overlays, presentation guides, and release prebuilds

Align control/presentation with presentation screen rect and darkness z-order; sync window titles and session window cleanup. Pack Win/Mac/Linux with npmRebuild disabled and release-native-prep for classic-level and sharp.

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

app/renderer/editor/MaterialsBrowser.tsx

@@ -19,7 +19,7 @@ export type MaterialsBrowserProps = {
   mode: 'editor' | 'runtime';
   selectedId: MaterialId | null;
   onSelect: (id: MaterialId | null) => void;
-  activeMaterialId?: MaterialId | null;
+  activeMaterialIds?: readonly MaterialId[];
   onAdd?: () => void;
   onEdit?: (material: ProjectMaterial) => void;
   onDelete?: (materialId: MaterialId) => Promise<void>;
@@ -40,7 +40,7 @@ export function MaterialsBrowser({
   mode,
   selectedId,
   onSelect,
-  activeMaterialId = null,
+  activeMaterialIds = [],
   onAdd,
   onEdit,
   onDelete,
@@ -74,6 +74,7 @@ export function MaterialsBrowser({
     return () => window.removeEventListener('mousedown', onDown);
   }, [menuFor]);
 
+  const activeSet = useMemo(() => new Set(activeMaterialIds), [activeMaterialIds]);
   const filtered = useMemo(() => {
     const q = query.trim().toLowerCase();
     if (!q) return materials;
@@ -126,7 +127,7 @@ export function MaterialsBrowser({
                 key={m.id}
                 material={m}
                 selected={m.id === selectedId}
-                active={m.id === activeMaterialId}
+                active={activeSet.has(m.id)}
                 showMenu={mode === 'editor'}
                 dragging={dragId === m.id}
                 dropPlace={dropPlace?.id === m.id ? dropPlace.place : null}
@@ -200,6 +201,16 @@ export function MaterialsBrowser({
                   legend={selected.legend}
                   previewUrl={selectedUrl}
                   rotationDeg={selected.rotationDeg ?? 0}
+                  rotateLabel={t('scene.rotate')}
+                  onRotate={
+                    onRotate
+                      ? () => {
+                          const cur = selected.rotationDeg ?? 0;
+                          const next = ((cur + 90) % 360) as 0 | 90 | 180 | 270;
+                          onRotate(selected.id, next);
+                        }
+                      : undefined
+                  }
                   onChange={(next) => {
                     void onLegendChange(selected.id, next);
                   }}
@@ -220,7 +231,7 @@ export function MaterialsBrowser({
                 )}
               </div>
             )}
-            {selected && onRotate ? (
+            {selected && onRotate && !onLegendChange ? (
               <div className={matStyles.previewActions}>
                 <Button
                   onClick={() => {