Backlot 0.4.1

Fixes found by running real Garbage Day and Asylum drafts through the service: placeholder page lengths are estimated, redrafted scripts with regenerated paragraph ids still match on reimport, and containment accepts case-differing paths and symlinked home folders. Apple Silicon, macOS 13+, unsigned: after install run xattr -dr com.apple.quarantine /Applications/Backlot.app or use Open Anyway.