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/AllocationTargetsView.swift

@@ -11,13 +11,13 @@ struct AllocationTargetsView: View {
                     Text("Total Targets")
                     Spacer()
                     Text(String(format: "%.0f%%", totalTargets))
-                        .foregroundColor(totalTargets == 100 ? .positiveGreen : .secondary)
+                        .foregroundStyle(totalTargets == 100 ? Color.positiveGreen : .secondary)
                 }
 
                 if totalTargets != 100 {
                     Text("Targets don't need to be perfect, but aiming for 100% keeps the drift view accurate.")
                         .font(.caption)
-                        .foregroundColor(.secondary)
+                        .foregroundStyle(.secondary)
                 }
             }
 
@@ -40,7 +40,7 @@ struct AllocationTargetsView: View {
                             .frame(width: 60)
 
                         Text("%")
-                            .foregroundColor(.secondary)
+                            .foregroundStyle(.secondary)
                     }
                 }
             } header: {