Fix speed-colored track: pre-compute hex color per segment, use get("color")

Instead of asking MapLibre to interpolate/step colors at render time
(which was silently failing), pre-compute the CSS hex color for each
segment in speedSegments() and store it as a "color" property.
speedColorExpression() is now Expression.get("color") — a simple
property lookup that MapLibre parses as a CSS color for line-color.

https://claude.ai/code/session_01YUbuZNDAoLea4cf9UGQ9qn

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