Fix the Rainbow Heatmap

Same warehouse metric, two chart designs. What changed, and why does it make the risk easier to read? Before: colorful, but priority is unclear. After: severity and workload point to the first action. Replaced rainbow hues with one ordered severity ramp, because ordered color helps the eye read more-versus-less instead of treating colors as unrelated categories. Sorted the rows by risk, because the business question is priority, not exploration of every cell equally. Added affected-volume context, because a high rate on a tiny base may not outrank a slightly lower rate affecting many more units. A good heatmap makes the…

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