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/Views/Settings/ImportDataView.swift

@@ -1,4 +1,5 @@
 import SwiftUI
+import CoreData
 import UniformTypeIdentifiers
 import UIKit
 
@@ -88,7 +89,7 @@ struct ImportDataView: View {
                             ProgressView()
                             Text("Reviewing import…")
                                 .font(.caption)
-                                .foregroundColor(.secondary)
+                                .foregroundStyle(.secondary)
                         }
                         .padding(.top, 8)
                     }
@@ -98,7 +99,7 @@ struct ImportDataView: View {
                             ProgressView(value: importProgress)
                             Text(importStatus)
                                 .font(.caption)
-                                .foregroundColor(.secondary)
+                                .foregroundStyle(.secondary)
                         }
                         .padding(.top, 8)
                     }
@@ -133,7 +134,7 @@ struct ImportDataView: View {
             .navigationTitle("Import Data")
             .navigationBarTitleDisplayMode(.inline)
             .toolbar {
-                ToolbarItem(placement: .navigationBarTrailing) {
+                ToolbarItem(placement: .topBarTrailing) {
                     Button("Done") { dismiss() }
                         .disabled(isImporting)
                 }
@@ -244,7 +245,7 @@ Personal,Stocks,Index Fund,2024-01-01,15000,12000,Long-term
             .font(.caption.monospaced())
             Text("Account, Contribution, and Notes are optional. Dates accept / or - and 24h/12h time.")
                 .font(.caption)
-                .foregroundColor(.secondary)
+                .foregroundStyle(.secondary)
         }
     }
 
@@ -325,7 +326,7 @@ Personal,Stocks,Index Fund,2024-01-01,15000,12000,Long-term
                     Text("Account")
                     Spacer()
                     Text(selectedAccountName ?? "Personal")
-                        .foregroundColor(.secondary)
+                        .foregroundStyle(.secondary)
                 }
             }
         } header: {
@@ -333,7 +334,7 @@ Personal,Stocks,Index Fund,2024-01-01,15000,12000,Long-term
         } footer: {
             if let accountErrorMessage {
                 Text(accountErrorMessage)
-                    .foregroundColor(.negativeRed)
+                    .foregroundStyle(Color.negativeRed)
             }
         }
     }