* fix: support onLoadingComplete in modern next/image shim
Add the deprecated-but-still-supported onLoadingComplete prop to the
modern next/image component, matching Next.js behavior where the
callback receives the underlying HTMLImageElement on load.
- Add onLoadingComplete to ImageProps interface and type declarations
- Wire handleLoad into all render paths (local, custom loader, remote)
- Destructure onLoad/onLoadingComplete in getImageProps to prevent leak
* fix: correct callback order and add remote URL test
- Swap onLoad/onLoadingComplete invocation order to match Next.js
(onLoad fires first, then onLoadingComplete)
- Fix stale comment that described legacy { naturalWidth, naturalHeight }
- Add remote URL (UnpicImage) SSR test for full path coverage
* add oxfmt formatter: config, scripts, CI, editor setup, docs
* rebuild lockfile
* fix: add Format to required checks list, remove dead ignore pattern
* run fmt
* add format to agents.md again
Nathan Nguyen