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/shared/ipc/contracts.ts

@@ -135,6 +135,9 @@ export const ipcChannels = {
     closeNpcs: 'windows.closeNpcs',
     openSceneEditor: 'windows.openSceneEditor',
     closeSceneEditor: 'windows.closeSceneEditor',
+    syncChromeTitles: 'windows.syncChromeTitles',
+    getPresentationContentSize: 'windows.getPresentationContentSize',
+    presentationContentSizeChanged: 'windows.presentationContentSizeChanged',
   },
   session: {
     stateChanged: 'session.stateChanged',
@@ -257,6 +260,7 @@ export type IpcEventMap = {
   [ipcChannels.video.stateChanged]: { state: VideoPlaybackState };
   [ipcChannels.license.statusChanged]: { snapshot: LicenseSnapshot };
   [ipcChannels.windows.multiWindowStateChanged]: { open: boolean };
+  [ipcChannels.windows.presentationContentSizeChanged]: { width: number; height: number };
   [ipcChannels.windows.sceneDescriptionContent]: { html: string };
   [ipcChannels.project.importZipProgress]: ZipProgressEvent;
   [ipcChannels.project.exportZipProgress]: ZipProgressEvent;
@@ -588,6 +592,10 @@ export type IpcInvokeMap = {
     req: Record<string, never>;
     res: { open: boolean };
   };
+  [ipcChannels.windows.getPresentationContentSize]: {
+    req: Record<string, never>;
+    res: { width: number; height: number } | { width: null; height: null };
+  };
   [ipcChannels.windows.openSceneDescription]: {
     req: { html: string };
     res: { ok: true };
@@ -632,6 +640,10 @@ export type IpcInvokeMap = {
     req: Record<string, never>;
     res: { ok: true };
   };
+  [ipcChannels.windows.syncChromeTitles]: {
+    req: { localeTag: string };
+    res: { ok: true };
+  };
   [ipcChannels.materialsOverlay.getState]: {
     req: Record<string, never>;
     res: { state: MaterialsOverlayState };