fix-area-all-zero.md

layerchart	patch

fix(Area): Handle degenerate domains (e.g. all-zero data) and unify y0/y1 baseline logic

• Guard against degenerate scale domains where min === max (e.g. [0, 0]), which caused yScale() to return NaN and break area path rendering
• Unify Area y0/y1 path computation to consistently use accessors through the scale, removing duplicate fallback logic