fix: implement automatic zorder assignment for proper trace layering #2445
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Box Plot Layering Fix - Summary
Problem
Fix box plot layering issue where box plots always rendered behind other traces (ribbons, lines) despite correct layer ordering in ggplot2.
Solution
Changes Made
1. Core Fix (R/ggplotly.R:1153-1162)
Added automatic zorder assignment loop that assigns sequential zorder values (zorder = i) to each trace based on their position in the data array.
2. plotly.js Update
Updated to v3.0.1 to support zorder functionality.
3. Test Coverage
Added test cases with visual regression tests to verify boxplot layering behavior.