Refine trends and debug harness; clean up warnings

FuelBoard/SettingsView.swift

@@ -408,7 +408,7 @@ struct SettingsView: View {
                 Label("In range", systemImage: "location.circle.fill")
                 Spacer()
                 HStack(spacing: 6) {
-                    if let coord = status.coordinate {
+                    if status.coordinate != nil {
                         Circle()
                             .fill(inRangeColor(status.inRangeCount))
                             .frame(width: 10, height: 10)
@@ -567,13 +567,17 @@ struct SettingsView: View {
                     testAlertMessage = NSLocalizedString("Notifications are turned off for FuelBoard. Enable them in Settings → Notifications → FuelBoard, then try again.", comment: "")
                 default:
                     // First time — ask, then fire if granted.
-                    UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound, .badge]) { granted, _ in
-                        Task { @MainActor in
+                    Task { @MainActor in
+                        do {
+                            let granted = try await UNUserNotificationCenter.current()
+                                .requestAuthorization(options: [.alert, .sound, .badge])
                             if granted {
                                 onTestAlert()
                             } else {
                                 testAlertMessage = NSLocalizedString("Notifications weren't allowed, so no test alert was sent.", comment: "")
                             }
+                        } catch {
+                            testAlertMessage = NSLocalizedString("Couldn't request notification permission right now. Please try again.", comment: "")
                         }
                     }
                 }