Widget tap relay via fuelboard:// scheme; full station names; no check-again

- WidgetKit widgets can only open their containing app — the Link URL is
  delivered to FuelBoard via onOpenURL, never opened directly in Maps. The
  widget now links to a registered fuelboard://directions?lat=&lng= URL,
  and FuelBoardApp forwards it to native maps://?daddr= directions.
  (http://maps.apple.com and raw maps:// both silently dropped in-app.)
- Widget rows (small + medium) now show the full station name (station.name)
  instead of just the brand.
- Onboarding network page: removed the 'Check again' secondary screen after
  the Local Network prompt — Open Settings remains the only retry path.
  35 tests pass.

FuelBoardWidgets/FuelPriceWidget.swift

@@ -224,7 +224,7 @@ struct FuelPriceWidgetView: View {
                     .font(.caption2)
                     .foregroundStyle(.secondary)
             }
-            Text(station.brand.sanitizedStationTitle)
+            Text(station.name)
                 .font(.headline)
                 .lineLimit(1)
             if let price = station.prices[entry.fuel] {
@@ -243,7 +243,7 @@ struct FuelPriceWidgetView: View {
             }
         }
         .frame(maxWidth: .infinity, maxHeight: .infinity, alignment: .leading)
-        .widgetURL(station.mapsDirectionsURL)
+        .widgetURL(station.widgetDirectionsURL)
     }
 
     private var stationList: some View {
@@ -261,9 +261,9 @@ struct FuelPriceWidgetView: View {
                     .foregroundStyle(.secondary)
             }
             ForEach(entry.stations.prefix(3)) { station in
-                Link(destination: station.mapsDirectionsURL ?? URL(string: "maps://")!) {
+                Link(destination: station.widgetDirectionsURL ?? URL(string: "fuelboard://")!) {
                     HStack(spacing: 8) {
-                        Text(station.brand.sanitizedStationTitle)
+                        Text(station.name)
                             .font(.caption.weight(.semibold))
                             .lineLimit(1)
                         if let location = entry.location {