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/Goals/GoalEditorView.swift

@@ -41,7 +41,7 @@ struct GoalEditorView: View {
                     TextField("Goal name", text: $name)
                     HStack {
                         Text(currencySymbol)
-                            .foregroundColor(.secondary)
+                            .foregroundStyle(.secondary)
                         TextField("Target amount", text: $targetAmount)
                             .keyboardType(.decimalPad)
                     }
@@ -73,10 +73,10 @@ struct GoalEditorView: View {
             }
             .navigationTitle(goal == nil ? "New Goal" : "Edit Goal")
             .toolbar {
-                ToolbarItem(placement: .navigationBarLeading) {
+                ToolbarItem(placement: .topBarLeading) {
                     Button("Cancel") { dismiss() }
                 }
-                ToolbarItem(placement: .navigationBarTrailing) {
+                ToolbarItem(placement: .topBarTrailing) {
                     Button("Save") { saveGoal() }
                         .disabled(!isValid)
                 }
@@ -86,7 +86,7 @@ struct GoalEditorView: View {
         .presentationDragIndicator(.visible)
         .onAppear {
             guard let goal, !didLoadGoal else { return }
-            name = goal.name ?? ""
+            name = goal.name
             if let amount = goal.targetAmount?.decimalValue {
                 targetAmount = formatDecimalForInput(amount)
             }