Simplify station financial verdicts

Shared/FuelSavings.swift

@@ -242,6 +242,19 @@ extension FuelSavingsResult {
     func capsuleHeadline() -> String {
         headline(compact: true)
     }
+
+    /// Short, amount-free verdict used only by station listing rows. The detail
+    /// sheet continues to use `capsuleHeadline()` so its full monetary verdict is
+    /// unchanged. Confidence follows the existing journey provenance exactly.
+    func listingCapsuleHeadline() -> String {
+        let approximate = journeyConfidence.isEstimated ? " (approx.)" : ""
+        switch status {
+        case .worthTheDrive: return "Saves\(approximate)"
+        case .notWorthTheDrive: return "Costs more\(approximate)"
+        case .breakEven: return "Break even\(approximate)"
+        case .baseline: return Self.baselineHeadline
+        }
+    }
 }
 
 /// One station's journey distance, plus how it was obtained.