v0.4.14 — drop inconsistent scatter LOESS band and the spaghetti legend

0.4.14 (2026-06-24)

Explore

• explore_scatter_plot no longer draws a LOESS confidence band. The shaded band was an
  unweighted bootstrap while the LOESS line is size-weighted under loess=2, so the line could
  fall outside its own band; the smoother now shows just the line.
• explore_spaghetti_plot no longer shows a legend. It was a single "mean (…)" entry that ate
  horizontal plot space; highlighted units still render in saturated colour.