ui: remove imperial units, hide Replay button on mobile

- formatDistance/formatSpeed: km/km/h only, no mi/mph
- Replay button hidden on mobile (d-none d-sm-table-cell)
- Action column header hidden on mobile to match
- data_table macro supports optional 'class' on column headers

Co-authored-by: Copilot <[email protected]>

static/js/history.js

@@ -36,14 +36,11 @@
     }
 
     function formatDistance(kilometers) {
-        const miles = kilometers * 0.621371;
-        return `${kilometers.toFixed(kilometers < 1 ? 2 : 1)} km / `
-            + `${miles.toFixed(miles < 1 ? 2 : 1)} mi`;
+        return `${kilometers.toFixed(kilometers < 1 ? 2 : 1)} km`;
     }
 
     function formatSpeed(kilometersPerHour) {
-        return `${kilometersPerHour.toFixed(1)} km/h / `
-            + `${(kilometersPerHour * 0.621371).toFixed(1)} mph`;
+        return `${kilometersPerHour.toFixed(1)} km/h`;
     }
 
     function showError(message) {
@@ -157,7 +154,7 @@
                 <td>${formatDuration(trip.duration_seconds)}</td>
                 <td>${formatSpeed(trip.max_speed_kmh)}</td>
                 <td class="text-muted small">${trip.odo_start_km.toFixed(0)} → ${trip.odo_end_km.toFixed(0)} km</td>
-                <td class="text-end">
+                <td class="text-end d-none d-sm-table-cell">
                     <button class="btn btn-sm btn-primary" type="button" data-trip-id="${trip.id}">
                         Replay
                     </button>