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.

Shared/FuelStore.swift

@@ -153,14 +153,21 @@ struct FuelStation: Identifiable, Codable, Equatable {
         return r * 2 * atan2(sqrt(a), sqrt(1 - a))
     }
 
-    /// Apple Maps directions URL — used by the widget tap and app rows.
-    /// Uses the native `maps://` scheme (not `http://maps.apple.com`), which
-    /// opens Maps directly; universal-link http URLs fall back to opening the
-    /// containing app when tapped from a widget.
+    /// Apple Maps directions URL — used by the app's rows/notifications, which
+    /// open it directly via `UIApplication.shared.open`.
     var mapsDirectionsURL: URL? {
         URL(string: "maps://?daddr=\(lat),\(lng)&t=d")
     }
 
+    /// Widget tap URL. WidgetKit widgets can ONLY open their containing app:
+    /// the system hands this URL to FuelBoard via `onOpenURL`, which then
+    /// forwards to Apple Maps. So the widget link uses our own registered
+    /// `fuelboard://` scheme rather than `maps://` (which would arrive in the
+    /// app and be silently dropped).
+    var widgetDirectionsURL: URL? {
+        URL(string: "fuelboard://directions?lat=\(lat)&lng=\(lng)")
+    }
+
     /// Name of the bundled brand logo asset, or nil if unknown.
     /// Normalizes messy raw brand strings ("SHELL LEEDS ROAD" → "shell").
     var brandImageName: String? {