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/FuelStore.swift

@@ -271,6 +271,30 @@ struct FuelStation: Identifiable, Codable, Equatable {
         URL(string: "maps://?daddr=\(lat),\(lng)&t=d")
     }
 
+    /// In-app deep link to this station's More info sheet. Carries the
+    /// stationID plus coordinate/name fallback so the app can still show the
+    /// map sheet when the station has left the cache.
+    var detailDeepLinkURL: URL? {
+        var components = URLComponents()
+        components.scheme = "fuelboard"
+        components.host = "station"
+        components.queryItems = [
+            URLQueryItem(name: "stationID", value: id),
+            URLQueryItem(name: "lat", value: String(lat)),
+            URLQueryItem(name: "lng", value: String(lng)),
+            URLQueryItem(name: "name", value: name),
+        ]
+        return components.url
+    }
+
+    /// Widget/Live Activity tap destination honouring Settings → Tap station:
+    /// Open map → Apple Maps directions; More info → in-app detail deep link.
+    var tapDestinationURL: URL? {
+        FuelStore.loadStationTapAction() == .showDetails
+            ? detailDeepLinkURL
+            : widgetDirectionsURL
+    }
+
     /// Name of the bundled brand logo asset, or nil if unknown.
     /// Normalizes messy raw brand strings ("SHELL LEEDS ROAD" → "shell").
     var brandImageName: String? {