Add Best Value small widget and standardise Closest wording

Shared/FuelPriceWidgetViews.swift

@@ -29,11 +29,12 @@ struct FuelPriceWidgetEntryData {
     let date: Date
     let stations: [FuelStation]   // already filtered + sorted per config
     let fuel: FuelType
-    let sort: SortMode            // per-widget: cheapest | closest
-    let isFavourites: Bool        // favourites mode: pinned stations, cheapest-first
+    let sort: SortMode            // per-widget: cheapest | closest | Best Value
+    let isFavourites: Bool        // favourites mode: pinned stations
     let location: Coordinate?
     let locationSource: String    // "live" | "cached" | "none"
     let unit: DistanceUnit        // user's display unit for distances
+    let bestValueResult: FuelSavingsResult? // only populated for the small Best Value face
 }
 
 /// The widget face, parameterised by family so the app can preview it.
@@ -67,9 +68,11 @@ struct FuelPriceWidgetContent: View {
 
     private var heading: String {
         if entry.isFavourites { return "Favourite \(entry.fuel.displayName)" }
-        return entry.sort == .closest
-            ? "Closest \(entry.fuel.displayName)"
-            : "Cheapest \(entry.fuel.displayName)"
+        switch entry.sort {
+        case .closest: return "Closest \(entry.fuel.displayName)"
+        case .worthTheDrive: return "Best Value \(entry.fuel.displayName)"
+        case .cheapest: return "Cheapest \(entry.fuel.displayName)"
+        }
     }
 
     private var singleStation: some View {
@@ -85,7 +88,15 @@ struct FuelPriceWidgetContent: View {
             Text(station.name)
                 .font(.headline)
                 .lineLimit(1)
-            if let price = station.prices[entry.fuel] {
+            if entry.sort == .worthTheDrive, let result = entry.bestValueResult {
+                Text(result.headline(compact: true))
+                    .font(.title3.weight(.bold))
+                    .lineLimit(1)
+                Text(result.status == .baseline ? "your baseline" : "vs closest station")
+                    .font(.caption2)
+                    .foregroundStyle(.secondary)
+                    .lineLimit(1)
+            } else if let price = station.prices[entry.fuel] {
                 FuelStore.priceTextAttributed(price, size: 26, weight: .bold, color: .green)
             }
             if let location = entry.location {