Release SpatialGen-Bench v1.1 quality revision

Use JSONL as the canonical dataset source

Remove redundant preview dataset

Restore unchanged release files

Add complete depth marker coordinates

Separate canonical loading from image preview

Simplify Dataset Viewer and group samples by task

Lead Dataset Viewer with a spatial grounding example

Add embedded previews for Dataset Viewer

Enable image previews in Dataset Viewer

Flatten single-media task directories

Add files using upload-large-folder tool