Update version across pyproject.toml, FastAPI app, HTML footers,
and V3.17 doc. Mark kicked-ball bug as resolved in docs.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Wrap golfer+ball in a positioned container so the ball is absolutely
anchored to the golfer's front foot, independent of inline flow/viewport.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>