Context. Customer visits vs spend — but Basic and Premium customers behave differently. Coloring by segment turns one cloud of dots into two stories.
Your task. Write make_segment_scatter(df) that draws a seaborn scatter of spend over visits, colored by segment using hue, and returns the axes.
Example. hue="segment" — each segment gets its own color and a legend entry.
Notes. The legend appears automatically once hue is set.