Clarify Best Value route confidence

FuelBoard/FuelSavingsViews.swift

@@ -92,9 +92,11 @@ struct FuelSavingsSummaryView: View {
                 // it to one line, so rows stay even.
                 VStack(alignment: .leading, spacing: 2) {
                     capsule(for: result, compact: true)
+                        .accessibilityLabel(accessibilityHeadline(for: result))
                     if let extraTravel = FuelSavingsFormat.extraTravelLabel(
                         extraDistanceMiles: result.extraDistanceMiles,
-                        unit: distanceUnit
+                        unit: distanceUnit,
+                        confidence: result.journeyConfidence
                     ) {
                         Text(extraTravel)
                             .font(.caption2)
@@ -114,9 +116,11 @@ struct FuelSavingsSummaryView: View {
                 // matched neither the listing nor each other.
                 VStack(alignment: .leading, spacing: 10) {
                     capsule(for: result, compact: false)
+                        .accessibilityLabel(accessibilityHeadline(for: result))
                     if let extraTravel = FuelSavingsFormat.extraTravelLabel(
                         extraDistanceMiles: result.extraDistanceMiles,
-                        unit: distanceUnit
+                        unit: distanceUnit,
+                        confidence: result.journeyConfidence
                     ) {
                         Text(extraTravel)
                             .font(.subheadline)
@@ -130,8 +134,8 @@ struct FuelSavingsSummaryView: View {
                         Text("Compared with \(baselineStationName ?? "your nearest station") for \(amountText).").font(.caption).foregroundStyle(.secondary)
                         LabeledContent("Fuel-price saving", value: FuelSavingsFormat.money(result.grossSavingGBP))
                         LabeledContent("Extra driving cost", value: FuelSavingsFormat.money(result.extraDrivingCostGBP))
-                        if result.distanceBasis.isEstimate {
-                            Text("Estimated from straight-line distance — refined once the route is measured.")
+                        if result.journeyConfidence.isEstimated {
+                            Text("Estimated from straight-line or incomplete route data — refined once both routes are measured.")
                                 .font(.caption2)
                                 .foregroundStyle(.secondary)
                         }
@@ -157,6 +161,13 @@ struct FuelSavingsSummaryView: View {
         }
     }
 
+    private func accessibilityHeadline(for result: FuelSavingsResult) -> String {
+        let headline = result.headline()
+        return result.journeyConfidence.isEstimated && result.status != .baseline
+            ? "Approximate: \(headline.replacingOccurrences(of: "~", with: ""))"
+            : headline
+    }
+
     /// The colour-coded verdict capsule — ONE implementation for the listing rows
     /// and the detail sheet, so the verdict reads identically in both; the sheet
     /// just gets the larger font and padding.