Drop deprecated MapKit and ActivityKit calls, and a dead capture

- RoadDistanceService builds route endpoints with MKMapItem(location:address:)
  instead of the MKPlacemark path deprecated in iOS 26.
- LiveActivityManager updates through ActivityContent, replacing the
  ActivityKit update(using:) call deprecated in iOS 16.2.
- The location-update hook no longer captures an unused state object; the
  closure body already runs on self, so behaviour is unchanged.

FuelBoard/LiveActivityManager.swift

@@ -79,7 +79,7 @@ enum LiveActivityManager {
                 currentStartDate = nil
                 start(attributes: attributes, state: state)
             } else {
-                Task { await current.update(using: state) }
+                Task { await current.update(ActivityContent(state: state, staleDate: nil)) }
             }
         } else {
             start(attributes: attributes, state: state)