Fix crash al abrir Import Data en Mac Catalyst (@EnvironmentObject no heredado en sheets)

ImportDataView usa @EnvironmentObject (iapService/accountStore/tabSelection).
En Mac (Designed for iPad) las sheets no heredan el environment vía
PresentationHostingController → EnvironmentObject.error() / SIGTRAP al abrir
Import Data (ImportDataView.swift:247, shouldShowAccountSelection). Reinyectados
los 3 objects en las sheets de Settings, Dashboard y Onboarding.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L2p3gUZRNWW388rWFRjiU7

PortfolioJournal/Views/Dashboard/DashboardView.swift

@@ -6,6 +6,7 @@ import TipKit
 struct DashboardView: View {
     @EnvironmentObject var iapService: IAPService
     @EnvironmentObject var accountStore: AccountStore
+    @EnvironmentObject var tabSelection: TabSelectionStore
     @StateObject private var viewModel: DashboardViewModel
     @StateObject private var goalsViewModel = GoalsViewModel()
     @State private var showingImport = false
@@ -110,7 +111,12 @@ struct DashboardView: View {
                 goalsViewModel.refresh()
             }
             .sheet(isPresented: $showingImport) {
+                // Re-inject env objects: sheets don't inherit @EnvironmentObject on
+                // Mac Catalyst (Designed for iPad) → ImportDataView crashed on open.
                 ImportDataView()
+                    .environmentObject(iapService)
+                    .environmentObject(accountStore)
+                    .environmentObject(tabSelection)
             }
             .sheet(isPresented: $showingAddSource) {
                 AddSourceView()