- Add flipPips flag: when chain goes LEFT or UP, tile.left/right are
  drawn on the correct screen side (previously always left=left/top)
- Fix corner turn offset: uses actual tile cross-axis extent instead
  of fixed TILE_H, preventing overlaps/gaps at corners
- Increase TILE_W from 24→26 for better proportions (less squished)
- Increase GAP slightly (1→2) so tiles don't visually merge
- Lower auto-zoom min to 0.3 for large chains
- Fix invalid hand tiles: use saturate(0.3)+brightness(0.85) instead
  of opacity+brightness that made them look solid dark gray
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>