Add setting to toggle forecast visibility in charts and dashboard

Adds a "Show Forecast" toggle in Settings > Long-Term Focus section.
When disabled, hides the forecast from the total portfolio card and
removes the prediction chart type from the charts tab.

Fixes #26

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

PortfolioJournal/Views/Charts/ChartsContainerView.swift

@@ -6,6 +6,7 @@ struct ChartsContainerView: View {
     @StateObject private var viewModel: ChartsViewModel
     @StateObject private var goalsViewModel = GoalsViewModel()
     @AppStorage("calmModeEnabled") private var calmModeEnabled = true
+    @AppStorage("showForecast") private var showForecast = true
 
     init(iapService: IAPService) {
         _viewModel = StateObject(wrappedValue: ChartsViewModel(iapService: iapService))
@@ -92,7 +93,7 @@ struct ChartsContainerView: View {
     private var chartTypeSelector: some View {
         ScrollView(.horizontal, showsIndicators: false) {
             HStack(spacing: 12) {
-                ForEach(viewModel.availableChartTypes(calmModeEnabled: calmModeEnabled)) { chartType in
+                ForEach(viewModel.availableChartTypes(calmModeEnabled: calmModeEnabled).filter { showForecast || $0 != .prediction }) { chartType in
                     ChartTypeButton(
                         chartType: chartType,
                         isSelected: viewModel.selectedChartType == chartType,

PortfolioJournal/Views/Dashboard/DashboardView.swift

@@ -11,6 +11,7 @@ struct DashboardView: View {
     @State private var showingCustomize = false
     @State private var sectionConfigs = DashboardLayoutStore.load()
     @AppStorage("calmModeEnabled") private var calmModeEnabled = true
+    @AppStorage("showForecast") private var showForecast = true
     @State private var pendingAlertDismissed = false
 
     init() {
@@ -165,7 +166,7 @@ struct DashboardView: View {
                     isPositive: calmModeEnabled
                         ? viewModel.latestPortfolioChange.absolute >= 0
                         : viewModel.isDayChangePositive,
-                    forecast: viewModel.portfolioForecast,
+                    forecast: showForecast ? viewModel.portfolioForecast : nil,
                     isPremium: iapService.isPremium,
                     onUnlockTap: {
                         viewModel.showingPaywall = true

PortfolioJournal/Views/Settings/SettingsView.swift

@@ -7,6 +7,7 @@ struct SettingsView: View {
     @StateObject private var viewModel: SettingsViewModel
     @EnvironmentObject private var adMobService: AdMobService
     @AppStorage("calmModeEnabled") private var calmModeEnabled = true
+    @AppStorage("showForecast") private var showForecast = true
     @AppStorage("cloudSyncEnabled") private var cloudSyncEnabled = false
     @AppStorage("faceIdEnabled") private var faceIdEnabled = false
     @AppStorage("pinEnabled") private var pinEnabled = false
@@ -568,6 +569,8 @@ struct SettingsView: View {
         Section {
             Toggle("Calm Mode", isOn: $calmModeEnabled)
 
+            Toggle("Show Forecast", isOn: $showForecast)
+
             NavigationLink {
                 AllocationTargetsView()
             } label: {
@@ -581,7 +584,7 @@ struct SettingsView: View {
         } header: {
             Text("Long-Term Focus")
         } footer: {
-            Text("Calm Mode hides short-term noise and advanced charts, keeping the app focused on monthly check-ins.")
+            Text("Calm Mode hides short-term noise and advanced charts. Show Forecast controls whether prediction data appears in portfolio and charts.")
         }
     }