[openstreetmap/openstreetmap-website] Add kilometers/miles switch to directions (PR #5915)

[Minh Nguyễn]

@1ec5 commented on this pull request.



>      } else {
-      return OSM.i18n.t("javascripts.directions.distance_km", { distance: Math.round(m / 1000) });
+      const ft = m / ftSize;
+      const mi = m / miSize;
+      if (ft < 1000) {

For what it’s worth, the [MapLibre Navigation SDK](https://github.com/maplibre/maplibre-navigation-ios/blob/f91faffa1aa03be16fc588dc5076b7811d1c5166/MapboxCoreNavigation/DistanceFormatter.swift#L146-L160) switches at 1,000 meters = 1 kilometer, 176 yards = 1 mile for the UK, or 528 feet = 1 mile for the U.S. (ignoring the rounding increments that are applied for readability at a glance). [Ferrostar](https://github.com/stadiamaps/ferrostar/blob/f10b01c03bec9554a7cf827327795d253ad4c1f0/apple/Sources/FerrostarCarPlayUI/Measurement/MKDistanceFormatterUnits.swift#L36-L54) switches at 1,000 meters = 1 kilometer, 300 yards = 0.17 miles for the UK, or 289 feet = 0.16 miles for the U.S. These navigation SDKs don’t aim for equivalent thresholds between measurement systems, since most users aren’t switching back and forth between them.

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