Add photos to elements

[dfalling]

Summary

• Add a Photos section to the element edit screen: pick from the device library, with add/remove thumbnails. Selected ids are sent as the element's complete photoIds set on save, so the one flow covers add/remove/reorder.
• On-device downsampling: every photo is re-encoded to JPEG and looped down in dimensions/quality until it's under the server's 5 MB cap (the resizer reports byte size, so the cap is guaranteed). Normalizing to JPEG also avoids HEIC/PNG the server may reject.
• Implements the three-step upload in src/photos/photoUpload.ts (usePhotoUploader): createUploadUrl → PUT bytes to S3 → createPhoto({type: S3, storageKey}).
• Adds react-native-image-picker + @bam.tech/react-native-image-resizer (both autolink for Android) and mocks them in jest.setup.js.
• Regenerates GraphQL types against the current schema — this also picks up the createS3Photo/createUnsplashPhoto → createPhoto consolidation that had drifted out of the committed types.

Notes

• Requires a native rebuild (bun run android) since native modules were added; library selection uses the Android system photo picker, so no new manifest permissions.
• Upload Content-Type is set to image/jpeg; adjust in putToSignedUrl if the server's presigned PUT binds a different content type.
• The Photo record is created at pick-time, so uploading then cancelling the edit without saving leaves an unattached photo server-side (harmless orphan).

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