Xcode 27: compila sin warnings y migra API deprecadas de SwiftUI

- Imports de CoreData que faltaban (MemberImportVisibility) en AccountsView,
  ImportDataView, ChartsContainerView y AddSourceView.
- Aislamiento MainActor: IsolatedDefaultValues en el target de la app,
  LinearGradient @MainActor, WatchSyncMessage nonisolated, closures de
  ReviewPromptService/MonthlyCheckInStore/AppIntents.
- Warnings de valores sin usar (SnapshotGapDetector, DashboardLayoutStore,
  OnboardingView, GoalEditorView, CoreDataStack, SettingsViewModel).
- foregroundColor→foregroundStyle, cornerRadius→clipShape,
  navigationBarLeading/Trailing→topBarLeading/Trailing,
  Task.sleep(nanoseconds:)→sleep(for:), NavigationLink(isActive:)→
  navigationDestination(isPresented:).

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01F1u4K16xy7eQVtgsYNZ9Vn

PortfolioJournal/Services/ReviewPromptService.swift

@@ -15,18 +15,18 @@ final class ReviewPromptService {
     private let minDaysBetweenPrompts = 30
     private let userDefaults: UserDefaults
     private let dateProvider: () -> Date
-    private let reviewRequestHandler: () -> Void
+    private let reviewRequestHandler: @MainActor () -> Void
 
     private init() {
         userDefaults = .standard
         dateProvider = Date.init
-        reviewRequestHandler = ReviewPromptService.defaultReviewRequestHandler
+        reviewRequestHandler = { ReviewPromptService.defaultReviewRequestHandler() }
     }
 
     init(
         userDefaults: UserDefaults,
         dateProvider: @escaping () -> Date,
-        reviewRequestHandler: @escaping () -> Void
+        reviewRequestHandler: @escaping @MainActor () -> Void
     ) {
         self.userDefaults = userDefaults
         self.dateProvider = dateProvider
@@ -93,6 +93,7 @@ final class ReviewPromptService {
         userDefaults.set(0, forKey: checkInCountKey)
     }
 
+    @MainActor
     private static func defaultReviewRequestHandler() {
         guard let scene = UIApplication.shared.connectedScenes.first as? UIWindowScene else { return }
         if #available(iOS 18.0, *) {