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/CSVMappingView.swift

@@ -29,7 +29,7 @@ struct CSVMappingView: View {
                                     VStack(alignment: .leading, spacing: 2) {
                                         Text(pair.0)
                                             .font(.caption2.weight(.semibold))
-                                            .foregroundColor(.secondary)
+                                            .foregroundStyle(.secondary)
                                         Text(pair.1.isEmpty ? "—" : pair.1)
                                             .font(.caption)
                                             .lineLimit(2)
@@ -117,10 +117,10 @@ struct CSVMappingView: View {
             .navigationTitle("Map Columns")
             .navigationBarTitleDisplayMode(.inline)
             .toolbar {
-                ToolbarItem(placement: .navigationBarLeading) {
+                ToolbarItem(placement: .topBarLeading) {
                     Button("Cancel") { dismiss() }
                 }
-                ToolbarItem(placement: .navigationBarTrailing) {
+                ToolbarItem(placement: .topBarTrailing) {
                     Button("Import") {
                         onComplete(config)
                         dismiss()
@@ -261,10 +261,10 @@ private struct MappingRow: View {
                     HStack(spacing: 4) {
                         Text(selectionLabel)
                             .font(.subheadline)
-                            .foregroundColor(index == ImportService.CSVMappingConfig.notMapped ? .secondary : .appPrimary)
+                            .foregroundStyle(index == ImportService.CSVMappingConfig.notMapped ? .secondary : Color.appPrimary)
                         Image(systemName: "chevron.up.chevron.down")
                             .font(.caption2)
-                            .foregroundColor(.secondary)
+                            .foregroundStyle(.secondary)
                     }
                 }
             }
@@ -332,10 +332,10 @@ private struct MappingRowWithConstant: View {
                     HStack(spacing: 4) {
                         Text(selectionLabel)
                             .font(.subheadline)
-                            .foregroundColor(index == ImportService.CSVMappingConfig.notMapped ? .secondary : .appPrimary)
+                            .foregroundStyle(index == ImportService.CSVMappingConfig.notMapped ? .secondary : Color.appPrimary)
                         Image(systemName: "chevron.up.chevron.down")
                             .font(.caption2)
-                            .foregroundColor(.secondary)
+                            .foregroundStyle(.secondary)
                     }
                 }
             }