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/project/zipStore.ts

@@ -1044,7 +1044,7 @@ export class ZipProjectStore {
       for (const asset of staged) {
         assets[asset.id] = asset;
         if (asset.type !== 'audio') continue;
-        campaignAudios.push({ assetId: asset.id, autoplay: true, loop: true });
+        campaignAudios.push({ assetId: asset.id, autoplay: false, loop: false });
       }
       return { ...p, assets, campaignAudios };
     });