Restore default WebP LFS tracking for resource previews

.gitattributes

@@ -59,5 +59,3 @@ saved_model/**/* filter=lfs diff=lfs merge=lfs -text
 *.mp4 filter=lfs diff=lfs merge=lfs -text
 *.webm filter=lfs diff=lfs merge=lfs -text
 
-# Small resource web previews are regular Git files, not model payloads.
-previews/** -filter -diff -merge