Delta mode previously took per-category magnitudes for the bars while
the detail panel below still showed cumulative totals. Now:
- The chart draws diverging stacks: growth piles up from a solid zero
baseline, shrinkage hangs down from it, with the zero line splitting
the bar area proportionally so the px-per-token scale is identical on
both sides. Axis reads +max / 0 / -max.
- The detail panel pairs the active request with the previous displayed
record (same pairing as the chart): a signed net chip replaces the
provider usage pills, category rows show signed figures on the
success/error tokens, and each row's mini bar diverges from a center
zero hairline, echoing the chart.
Bowen Liang
efcdd37cb7