feat(frontend): replay mode, camera angle fix, endpoint alignment

refactor(app): update App and StepFeed for new fold/metrics schema

refactor(metrics): replace reward decomposition with engine metrics

feat(3d): render engine paper_state directly with strain heatmap

fix(canvas): adapt CreaseCanvas to engine FOLD-format paper_state

fix-spaces (#4)

iana (#1)

Duplicate from static-templates/react