feat: honour Tap station action in widgets

Small widgetURL and medium list Links route through
StationTapAction via FuelStation.tapDestinationURL: Open map
keeps the Maps URL, More info uses a fuelboard://station
deep link (stationID plus coordinate/name fallback).

Deep link carries fallback coords; ContentView presents the
detail sheet when the station is cached, else the map sheet.
Live Activity detailURL upgraded to the same rich link.

Shared/FuelPriceWidgetViews.swift

@@ -99,7 +99,7 @@ struct FuelPriceWidgetContent: View {
             }
         }
         .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .leading)
-        .modifier(WidgetURLModifier(url: isWidget ? station.widgetDirectionsURL : nil))
+        .modifier(WidgetURLModifier(url: isWidget ? station.tapDestinationURL : nil))
     }
 
     /// How many station rows each family can fit: medium widgets are short
@@ -129,7 +129,7 @@ struct FuelPriceWidgetContent: View {
             }
             ForEach(entry.stations.prefix(maxRows)) { station in
                 if isWidget {
-                    Link(destination: station.widgetDirectionsURL ?? URL(string: "maps://")!) {
+                    Link(destination: station.tapDestinationURL ?? URL(string: "maps://")!) {
                         row(station, cheapest: cheapest)
                     }
                     .buttonStyle(.plain)