fix: ignore macOS zip metadata entries

[ifer47]

Summary

• ignore __MACOSX entries regardless of whether the directory is at the zip root or nested
• ignore dot-prefixed metadata files in nested directories as well as at the root

Why

macOS archives often include entries like __MACOSX/._image.png. The previous check only matched "/__MACOSX/", so root-level __MACOSX/... entries could be treated as real files and passed into the conversion flow.

Testing

• bunx eslint src/lib/util/zip.ts
• bun run build

[JovannMC]

closing as it was fixed in The Overdue Update Drop:tm:

thank you anyways!