CodeRabbit correctly noted that hard-coding #2ea043 and #ff7b72 in the
test decoupled the contrast assertions from the colors the view
actually renders, so a palette change could leave them passing.
The test now reads the legend glyphs, the legend colors, the
riskColor() returns, and the body background back out of the rendered
HTML, and asserts that the legend and canvas palettes agree before
checking any ratio. Verified both directions: a mismatched canvas
color fails the palette check, and a full revert to #3fb950 fails the
luminance check at 1.01:1.
Extends the coverage to the traffic level and the body background,
which were previously unchecked.
Co-Authored-By: CommandCodeBot <noreply@commandcode.ai>
