Tie alerts attach the app icon explicitly

LiveContainer shows its own icon in the notification header, so tied
alerts (which carry no map) now attach the app's compiled
AppIcon60x60@2x.png so the FuelBoard identity shows as the banner
thumbnail and in the expanded view. Single-station alerts keep the map
embed.

FuelBoard/ProximityMonitor.swift

@@ -261,11 +261,19 @@ final class ProximityMonitor: NSObject, ObservableObject, @preconcurrency CLLoca
 
         // Tie case: no map. A snapshot would only show one arbitrary station
         // (the primary), which is misleading — the user must pick from the
-        // action buttons. Deliver immediately with the choice buttons.
+        // action buttons. Deliver immediately with the choice buttons, and
+        // attach the app icon so the FuelBoard identity shows explicitly
+        // (the notification header icon is the container's inside
+        // LiveContainer, so the banner's right-hand thumbnail is the icon).
         if !ties.isEmpty {
             self.registerTieCategory(identifier: identifier, ties: ties)
             content.categoryIdentifier = "tie-\(identifier)"
+            if let icon = Self.appIconAttachment() {
+                content.attachments = [icon]
+                mapStatus?("map: none (tie) · icon: attached")
+            } else {
                 mapStatus?("map: none (tie — pick a station)")
+            }
             UNUserNotificationCenter.current().add(
                 UNNotificationRequest(identifier: identifier, content: content, trigger: nil)
             )
@@ -365,6 +373,17 @@ final class ProximityMonitor: NSObject, ObservableObject, @preconcurrency CLLoca
         }
     }
 
+    /// The app's own icon as a notification attachment, so the FuelBoard
+    /// identity shows explicitly even though the notification header icon is
+    /// the container's inside LiveContainer. Pulls the compiled
+    /// AppIcon60x60@2x.png straight from the bundle.
+    private static func appIconAttachment() -> UNNotificationAttachment? {
+        guard let url = Bundle.main.url(forResource: "AppIcon60x60@2x", withExtension: "png") else {
+            return nil
+        }
+        return try? UNNotificationAttachment(identifier: "icon", url: url, options: nil)
+    }
+
     /// Fires a test alert built from REAL data: the cheapest station selling
     /// the monitored fuel within the configured alert radius of the current
     /// location — the same criteria a live geofence entry would apply, minus