Retire the Best Value proximity alert option; move Key sheet copy into a tested model

- Alerts: drop the alert-type picker and the Best Value alert path, so
  proximity alerts always follow the cheapest station. A stored `bestValue`
  selection now falls back to cheapest when loaded.
- Key sheet: the price-rating, savings, station-label and favourite wording
  comes from `KeySheetContent` in Shared/FuelSavings.swift — a Foundation-only
  model with tests that pin the exact meaning of each indicator — and the
  sheet is built from that model rather than inline strings.
- BACKLOG: record the plan to restore Best Value proximity alerts behind one
  shared evaluator (user-location baseline, a single disclosed qualification
  rule, and real/Test alert parity).
- Bump CURRENT_PROJECT_VERSION to 29.

FuelBoard/ContentView.swift

@@ -37,7 +37,6 @@ struct ContentView: View {
     @State private var alertsEnabled: Bool = FuelStore.loadAlertsEnabled()
     @State private var alertsRadius: Double = FuelStore.loadAlertsRadius()
     @State private var alertsFuel: FuelType = FuelStore.loadAlertsFuel()
-    @State private var alertsMode: AlertMode = FuelStore.loadAlertsMode()
     @State private var alertsBestValueThresholdGBP: Double = FuelStore.loadAlertsBestValueThresholdGBP()
     @State private var favouriteDropAlertsEnabled: Bool = FuelStore.loadFavouriteDropAlertsEnabled()
     @State private var favouriteDropAlertsFuel: FuelType = FuelStore.loadFavouriteDropAlertsFuel()
@@ -152,23 +151,13 @@ struct ContentView: View {
         FuelStore.effectiveAlertsRadiusKM(followsSearch: alertsFollowsSearch, manualKM: alertsRadius)
     }
 
-    private var effectiveAlertsMode: AlertMode {
-        (alertsMode == .bestValue && !fuelSavingsSettings.isConfigured) ? .cheapest : alertsMode
-    }
-
-    private func ensureBestValueAlertModeIsAvailable() {
-        guard alertsMode == .bestValue, !fuelSavingsSettings.isConfigured else { return }
-        alertsMode = .cheapest
-        FuelStore.saveAlertsMode(.cheapest)
-    }
-
     private func updateAlertMonitor(fuel overrideFuel: FuelType? = nil) {
         monitor.update(
             stations: stations,
             favourites: refreshedFavourites,
             fuel: overrideFuel ?? alertsFuel,
             radiusKM: effectiveAlertsRadiusKM,
-            alertMode: effectiveAlertsMode,
+            alertMode: .cheapest,
             bestValueThresholdGBP: alertsBestValueThresholdGBP,
             fuelSavingsSettings: fuelSavingsSettings,
             fuelSavingsAmount: sessionFuelSavingsAmount
@@ -1154,7 +1143,6 @@ struct ContentView: View {
                 // or the choice wouldn't take effect until the next launch.
                 fuelSavingsSettings = FuelStore.loadFuelSavingsSettings()
                 sessionFuelSavingsAmount = fuelSavingsSettings.preferredAmount
-                ensureBestValueAlertModeIsAvailable()
                 locationManager.startForegroundTracking()
                 installLocationUpdateHook()
                 ensureBackgroundMotionTrackingIfNeeded()
@@ -1174,7 +1162,6 @@ struct ContentView: View {
 #if DEBUG
             print("FB-SAVINGS settings changed: enabled=\(old.enabled)->\(new.enabled) configured=\(new.isConfigured)")
 #endif
-            ensureBestValueAlertModeIsAvailable()
             updateAlertMonitor()
         }
         .onChange(of: sessionFuelSavingsAmount) { _, _ in
@@ -1257,16 +1244,6 @@ struct ContentView: View {
             FuelStore.saveAlertsFuel(newValue)
             updateAlertMonitor(fuel: newValue)
         }
-        .onChange(of: alertsMode) { _, newValue in
-            if newValue == .bestValue, !fuelSavingsSettings.isConfigured {
-                alertsMode = .cheapest
-                FuelStore.saveAlertsMode(.cheapest)
-                updateAlertMonitor()
-                return
-            }
-            FuelStore.saveAlertsMode(newValue)
-            updateAlertMonitor()
-        }
         .onChange(of: alertsBestValueThresholdGBP) { _, newValue in
             FuelStore.saveAlertsBestValueThresholdGBP(newValue)
             updateAlertMonitor()
@@ -1609,9 +1586,6 @@ struct ContentView: View {
             enabled: $alertsEnabled,
             radius: $alertsRadius,
             fuel: $alertsFuel,
-            alertMode: $alertsMode,
-            bestValueThresholdGBP: alertsBestValueThresholdGBP,
-            bestValueConfigured: fuelSavingsSettings.isConfigured,
             favouriteDropEnabled: $favouriteDropAlertsEnabled,
             favouriteDropFuel: $favouriteDropAlertsFuel,
             followsSearch: $alertsFollowsSearch,
@@ -2053,9 +2027,7 @@ struct StationRow: View {
                 // scaled down or truncated.
                 if let price = station.prices[fuel] {
                     HStack(spacing: 5) {
-                        Circle()
-                            .fill(ragColor)
-                            .frame(width: 8, height: 8)
+                        PriceRatingDot(color: ragColor)
                         FuelStore.priceTextAttributed(price, style: priceDisplayStyle,
                                                      size: priceSize, weight: .bold)
                             .lineLimit(1)
@@ -2088,8 +2060,7 @@ struct StationRow: View {
         Button {
             onToggleFavourite()
         } label: {
-            Image(systemName: isFavourite ? "star.fill" : "star")
-                .foregroundStyle(isFavourite ? .yellow : .secondary)
+            FavouriteStarGlyph(isFavourite: isFavourite)
         }
         .buttonStyle(.borderless)
     }
@@ -2110,14 +2081,7 @@ struct StationRow: View {
     /// app: coloured text keeps its contrast in both appearances, at every
     /// Dynamic Type size, without introducing a colour outside the palette.
     private func badgeCapsule(_ badge: StationRecommendationBadge) -> some View {
-        Text(badge.title)
-            .font(.caption2.bold())
-            .foregroundStyle(badge.tint)
-            .padding(.horizontal, 7)
-            .padding(.vertical, 3)
-            .background(Capsule().fill(badge.tint.opacity(0.15)))
-            .lineLimit(1)
-            .fixedSize()
+        StationLabelBadge(label: badge.title, color: badge.tint)
     }
 }