Fix Dataset Viewer schema with Arrow JSON provenance fields

Fix common split schema for Dataset Viewer

Release repaired Active-SWE v0.4 data

Update release Parquet with normalized Django hard GT identifiers

Use Active-SWE and Active-SWE-Extend viewer file names

Remove ambiguous viewer path data/extend/train.parquet

Remove ambiguous viewer path data/main/train.parquet

Use named Main and Extend viewer files: data/extend-00000-of-00001.parquet

Use named Main and Extend viewer files: data/main-00000-of-00001.parquet

Add separate HF viewer split: data/extend/train.parquet

Add separate HF viewer split: data/main/train.parquet