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.

FuelBoardWidgets/FuelBoardLiveActivityView.swift

@@ -2,7 +2,8 @@
 //
 // Lives in the widget extension (the standard host for ActivityConfiguration).
 // Shows the cheapest station for the pinned fuel within the app's chosen
-// radius. Tapping anywhere opens Apple Maps directions to that station.
+// radius. Tapping honours Settings → Tap station: Open map opens Apple Maps
+// directions to that station, More info opens the detail sheet in the app.
 //
 // ADAPTIVE LAYOUT: the Lock Screen body provides two layouts and lets
 // ViewThatFits pick by available width, but the narrow `.small` family is NOT
@@ -254,8 +255,19 @@ extension FuelBoardLiveActivityAttributes.ContentState {
     }
 
     /// In-app deep link to the station's detail sheet, used when
-    /// Settings → Tap station = More info.
+    /// Settings → Tap station = More info. Carries coordinate/name fallback
+    /// so the app can still show the map sheet when the station has left
+    /// the cache.
     var detailURL: URL {
-        URL(string: "fuelboard://station?stationID=\(stationID)")!
+        var components = URLComponents()
+        components.scheme = "fuelboard"
+        components.host = "station"
+        components.queryItems = [
+            URLQueryItem(name: "stationID", value: stationID),
+            URLQueryItem(name: "lat", value: String(lat)),
+            URLQueryItem(name: "lng", value: String(lng)),
+            URLQueryItem(name: "name", value: stationName),
+        ]
+        return components.url!
     }
 }