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/main/index.ts

@@ -47,6 +47,7 @@ import {
   createEditorWindowDeferred,
   createWindows,
   focusEditorWindow,
+  getPresentationContentSize,
   getSceneDescriptionContent,
   isMultiWindowOpen,
   markAppQuitting,
@@ -61,6 +62,7 @@ import {
   closeSceneEditorWindow,
   closeNpcsWindow,
   sendToAppWindows,
+  syncAllWindowChromeTitles,
   togglePresentationFullscreen,
   waitForEditorWindowReady,
   warmNpcsEditorWindow,
@@ -414,6 +416,10 @@ async function main() {
     closeMultiWindow();
     return { ok: true };
   });
+  registerHandler(ipcChannels.windows.syncChromeTitles, ({ localeTag }) => {
+    syncAllWindowChromeTitles(localeTag);
+    return { ok: true };
+  });
   registerHandler(ipcChannels.windows.togglePresentationFullscreen, () => {
     const isFullScreen = togglePresentationFullscreen();
     return { ok: true, isFullScreen };
@@ -421,6 +427,10 @@ async function main() {
   registerHandler(ipcChannels.windows.getMultiWindowState, () => {
     return { open: isMultiWindowOpen() };
   });
+  registerHandler(ipcChannels.windows.getPresentationContentSize, () => {
+    const size = getPresentationContentSize();
+    return size ?? { width: null, height: null };
+  });
   registerHandler(ipcChannels.windows.openSceneDescription, ({ html }) => {
     openSceneDescriptionWindow(html);
     return { ok: true };