Remove redundant comparison mode notice

FuelBoard/FuelSavingsViews.swift

@@ -3,7 +3,6 @@ import SwiftUI
 struct FuelSavingsAdjustmentView: View {
     @Binding var amount: FuelSavingsFillAmount
 
-    @State private var unitChangeNotice: String?
     @State private var showingComparisonHelp = false
 
     private var range: ClosedRange<Double> {
@@ -71,11 +70,6 @@ struct FuelSavingsAdjustmentView: View {
             Text("Adjust your fill-up amount for this visit. Your default won’t change.")
                 .font(.caption2)
                 .foregroundStyle(.secondary)
-            if let unitChangeNotice {
-                Text(unitChangeNotice)
-                    .font(.caption2)
-                    .foregroundStyle(.orange)
-            }
         }
     }
 
@@ -84,10 +78,9 @@ struct FuelSavingsAdjustmentView: View {
             get: { amount.unit },
             set: { newUnit in
                 guard newUnit != amount.unit else { return }
-                // No one litre figure equals a budget at every candidate price.
-                // A unit change starts a new, explicitly labelled comparison.
+                // No one litre figure equals a budget at every candidate price,
+                // so switching modes starts from that mode's configured default.
                 amount = FuelSavingsCalculator.newComparisonAmount(afterSwitching: amount, to: newUnit)
-                unitChangeNotice = "New comparison basis — adjust the \(newUnit.displayName) amount to your intended fill-up."
             }
         )
     }