live activity: tint pump glyph by monitored fuel

Move FuelType.tintColor (green=unleaded #30D158, yellow=premium #FFD60A,
cyan=diesel #64D2FF) into Shared/FuelStore.swift so the app, widget, and
Live Activity all read one definition (was app-only in StationsView, so the
widget couldn't see it). Tint the Live Activity rich card pump icon and the
Dynamic Island compactLeading pump by context.state.fuel.tintColor.

FuelBoard/StationsView.swift

@@ -317,17 +317,6 @@ extension FuelType {
         case .diesel: return "Diesel"
         }
     }
-
-    /// Fuel colour wheel (user-chosen palette): green = unleaded (#30D158),
-    /// yellow = premium (#FFD60A), cyan = diesel (#64D2FF). Used for the
-    /// fuel-type tab icons and the title icon.
-    var tintColor: Color {
-        switch self {
-        case .e10: return Color(red: 48/255.0, green: 209/255.0, blue: 88/255.0)      // #30D158
-        case .e5: return Color(red: 255/255.0, green: 214/255.0, blue: 10/255.0)      // #FFD60A
-        case .diesel: return Color(red: 100/255.0, green: 210/255.0, blue: 255/255.0) // #64D2FF
-        }
-    }
 }
 
 /// Fuel-type selector styled like a segmented control, with a coloured pump

FuelBoardWidgets/FuelBoardLiveActivityView.swift

@@ -41,7 +41,7 @@ struct FuelBoardLiveActivity: Widget {
                 }
             } compactLeading: {
                 Image(systemName: "fuelpump.fill")
-                    .foregroundStyle(.green)
+                    .foregroundStyle(context.state.fuel.tintColor)
             } compactTrailing: {
                 FuelBoardLiveActivityPriceView(context: context)
             } minimal: {
@@ -95,7 +95,7 @@ private struct FuelBoardLiveActivityView: View {
             // LEFT — station brand glyph
             Image(systemName: "fuelpump.circle.fill")
                 .font(.system(size: 32))
-                .foregroundStyle(.green, .white)
+                .foregroundStyle(context.state.fuel.tintColor, .white)
                 .frame(width: 40, height: 40)
 
             // MIDDLE — fuel + station

Shared/FuelStore.swift

@@ -8,6 +8,7 @@
 //   keychain → app-group defaults → fallback.
 
 import Foundation
+import SwiftUI
 import Security
 #if canImport(AppIntents)
 import AppIntents
@@ -99,6 +100,20 @@ enum FuelType: String, Codable, CaseIterable, Identifiable {
     }
 }
 
+/// Fuel colour wheel (user-chosen palette): green = unleaded (#30D158),
+/// yellow = premium (#FFD60A), cyan = diesel (#64D2FF). Lives here in Shared
+/// so the app, widget, and Live Activity all tint the pump/fuel glyphs from one
+/// definition.
+extension FuelType {
+    var tintColor: Color {
+        switch self {
+        case .e10: return Color(red: 48/255.0, green: 209/255.0, blue: 88/255.0)      // #30D158
+        case .e5: return Color(red: 255/255.0, green: 214/255.0, blue: 10/255.0)      // #FFD60A
+        case .diesel: return Color(red: 100/255.0, green: 210/255.0, blue: 255/255.0) // #64D2FF
+        }
+    }
+}
+
 #if canImport(AppIntents)
 extension FuelType: AppEnum {}
 #endif