DEFAULT_BAR_FILL and the four intent-bearing entries of
semanticStatusColors move to a softer, lower-saturation set tuned
for chart legibility:
- bar fill / info: #2563eb / #1d4ed8 → #4075e7
- success: #16a34a → #46ac6b
- warning: #ea580c → #f38043
- error: #dc2626 → #eb5252
Adjacent slices in a donut and series in a stacked bar fight less
visually with the softened palette. Same a11y posture (AA contrast
on white surfaces, deuteranopia/protanopia distinguishability via
lightness deltas, not just hue).