Improve onboarding iCloud linking

PortfolioJournal/Views/Onboarding/OnboardingView.swift

@@ -1,4 +1,5 @@
 import SwiftUI
+import UIKit
 
 struct OnboardingView: View {
     @Binding var onboardingCompleted: Bool
@@ -274,6 +275,16 @@ struct OnboardingQuickStartView: View {
                         .font(.caption)
                         .foregroundColor(.secondary)
                         .frame(maxWidth: .infinity, alignment: .leading)
+
+                    Button {
+                        openAppSettings()
+                    } label: {
+                        Label("Open iCloud Settings", systemImage: "gear")
+                            .frame(maxWidth: .infinity)
+                    }
+                    .padding()
+                    .background(Color.appPrimary.opacity(0.1))
+                    .cornerRadius(12)
                 }
 
                 HStack(spacing: 12) {
@@ -304,6 +315,11 @@ struct OnboardingQuickStartView: View {
             Spacer()
         }
     }
+
+    private func openAppSettings() {
+        guard let url = URL(string: UIApplication.openSettingsURLString) else { return }
+        UIApplication.shared.open(url)
+    }
 }
 
 // MARK: - First Launch Welcome