fix(project): race-safe batch scene preview import and close

Serialize updateProject and preview finalize, drain before pack/close, buffer zip entries, and abort finalize cleanly when leaving the project to avoid ENOENT on multi-image drops.

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

app/main/project/scenePreviewThumbnail.ts

@@ -14,14 +14,15 @@ export const SCENE_PREVIEW_THUMB_MAX_PX = 320;
 
 /**
  * Builds a small WebP still for graph/list previews. Returns null if generation fails (import still succeeds).
+ * For images, prefer a Buffer so callers are not racy with reconcileAssetFiles unlinking paths.
  */
 export async function generateScenePreviewThumbnailBytes(
-  sourceAbsPath: string,
+  source: string | Buffer,
   kind: 'image' | 'video',
 ): Promise<Buffer | null> {
   try {
     if (kind === 'image') {
-      return await sharp(sourceAbsPath)
+      return await sharp(source)
         .rotate()
         .resize(SCENE_PREVIEW_THUMB_MAX_PX, SCENE_PREVIEW_THUMB_MAX_PX, {
           fit: 'inside',
@@ -31,6 +32,9 @@ export async function generateScenePreviewThumbnailBytes(
         .toBuffer();
     }
 
+    const sourceAbsPath = typeof source === 'string' ? source : null;
+    if (!sourceAbsPath) return null;
+
     const ffmpegPath = ffmpegStatic;
     if (!ffmpegPath) return null;