feat: honour Tap station action on notification and Live Activity taps

Notification body/action taps route through StationTapAction:
Open map opens Apple Maps (existing); More info presents the
in-app detail sheet (falls back to the map sheet when the
station is not in cache).

Live Activity Lock Screen card and island station row pick
their Link destination the same way: Maps URL for Open map,
fuelboard://station deep link for More info, handled in
FuelBoardApp and observed by ContentView.

Also adds the small non-interactive map preview above the
Directions button in the More info sheet.

FuelBoardWidgets/FuelBoardLiveActivityView.swift

@@ -84,7 +84,7 @@ private struct FuelBoardLiveActivityView: View {
     @State private var slotWidth: CGFloat = 400
 
     var body: some View {
-        Link(destination: context.state.mapsURL) {
+        Link(destination: tapDestination) {
             Group {
                 // Branch on the ACTUAL proposed width. iPhone/iPad offer the
                 // full Lock Screen width (>= threshold) → rich card, no matter
@@ -210,9 +210,26 @@ private struct FuelBoardLiveActivityStationView: View {
     let context: ActivityViewContext<FuelBoardLiveActivityAttributes>
 
     var body: some View {
-        Text("\(context.state.stationName) · \(context.state.distanceText)")
-            .font(.caption)
-            .lineLimit(1)
+        Link(destination: FuelBoardLiveActivityTap.tapDestination(for: context.state)) {
+            Text("\(context.state.stationName) · \(context.state.distanceText)")
+                .font(.caption)
+                .lineLimit(1)
+        }
+    }
+}
+
+/// Tap routing shared by the Lock Screen card and the island: honours
+/// Settings → Tap station (Open map → Maps, More info → in-app detail).
+enum FuelBoardLiveActivityTap {
+    static func tapDestination(for state: FuelBoardLiveActivityAttributes.ContentState) -> URL {
+        FuelStore.loadStationTapAction() == .showDetails ? state.detailURL : state.mapsURL
+    }
+}
+
+private extension FuelBoardLiveActivityView {
+    /// Lock Screen tap honours Settings → Tap station.
+    var tapDestination: URL {
+        FuelBoardLiveActivityTap.tapDestination(for: context.state)
     }
 }
 
@@ -235,4 +252,10 @@ extension FuelBoardLiveActivityAttributes.ContentState {
     var mapsURL: URL {
         URL(string: "maps://?daddr=\(lat),\(lng)&t=d")!
     }
+
+    /// In-app deep link to the station's detail sheet, used when
+    /// Settings → Tap station = More info.
+    var detailURL: URL {
+        URL(string: "fuelboard://station?stationID=\(stationID)")!
+    }
 }