fix: smart alarm feature fails to fetch when application is not opened for a long period of time

SleepFocus/SleepFocusApp.swift

@@ -11,6 +11,9 @@ struct SleepFocusApp: App {
     @StateObject private var insightsStore = InsightsStore()
     private let healthAutoSyncService = HealthAutoSyncService.shared
 
+    // Observe scene phase to detect app foregrounding.
+    @Environment(\.scenePhase) private var scenePhase
+
     var body: some Scene {
         WindowGroup {
             Group {
@@ -52,6 +55,24 @@ struct SleepFocusApp: App {
                 guard authManager.isAuthenticated else { return }
                 await healthAutoSyncService.startIfNeeded(authManager: authManager)
             }
+            // When the app returns to foreground, force-refresh smart alarm guidance
+            // so the backend model result is used instead of the fallback.
+            .onChange(of: scenePhase) { _, newPhase in
+                guard newPhase == .active, authManager.isAuthenticated else { return }
+                Task {
+                    guard !sleepPreferences.isRefreshingSmartAlarmGuidance else { return }
+
+                    await sleepPreferences.refreshSmartAlarmCycleGuidance(
+                        using: authManager,
+                        force: true
+                    )
+
+                    guard !sleepPreferences.isRefreshingSmartAlarmGuidance else { return }
+                    await sleepPreferences.syncSmartAlarmRuntime(
+                        notificationSettings: notificationSettings
+                    )
+                }
+            }
             .onOpenURL { url in
                 navigationManager.handleDeepLink(url)
             }