Add Best Value small widget and standardise Closest wording

Shared/FuelSavings.swift

@@ -144,10 +144,10 @@ enum FuelSavingsFormat {
     }
 
     /// Compact comparison copy kept outside the coloured verdict capsule.
-    /// "Nearest" refers to the existing shortest-journey baseline selection;
+    /// "Closest" refers to the existing shortest-journey baseline selection;
     /// it does not claim a straight-line comparison.
     static func comparisonLabel(status: FuelSavingsStatus) -> String {
-        status == .baseline ? "your baseline" : "vs nearest station"
+        status == .baseline ? "your baseline" : "vs closest station"
     }
 
     /// VoiceOver form of `extraTravelLabel`. The abbreviation and the unit suffix
@@ -222,13 +222,11 @@ extension FuelSavingsResult {
         headline().replacingOccurrences(of: "Approx. ", with: "Approximately ")
     }
 
-    /// Row capsule copy: the headline, plus what the baseline row IS. Without the
-    /// suffix the baseline capsule just repeated the status word above it
-    /// ("Closest station" twice) and said nothing about the saving being measured
-    /// against it.
+    /// Row capsule copy. The baseline relationship is shown as secondary text
+    /// beside the capsule in the station listing and detail summary, so the
+    /// capsule itself contains only the verdict.
     func capsuleHeadline() -> String {
-        let headline = headline(compact: true)
-        return status == .baseline ? "\(headline) · your baseline" : headline
+        headline(compact: true)
     }
 }