E2E fixes:
- Color mode select locator now uses option[value='highway'] filter
instead of fragile page.locator("select").last()
Speed limit color mode:
- Extract maxspeed tags from BRouter tiledesc (with forward/backward
direction handling following brouter-web's pattern)
- Color route and chart by speed limit: green ≤30, yellow ≤50,
orange ≤70, red ≤100, dark red 100+ km/h
- Legend with speed thresholds, hover shows "X km/h"
- i18n: EN "Speed Limit" / DE "Tempolimit"
- Mock fixtures include maxspeed data
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
4bcd6137de