Rediseño Charts iPad, zoom en gráficas, eliminación de Focus Mode y fixes de rendimiento

Charts iPad (rediseño):
- Fila de KPIs sobre el chart: Total Value, Period Return, CAGR, Volatility y Max
  Drawdown del rango activo (nuevo ChartsViewModel.portfolioMetrics, calculado sobre
  los TOTALES MENSUALES AGREGADOS — pasar snapshots multi-source crudos a
  calculateMetrics producía KPIs absurdos)
- Sidebar (248pt) con tiles de chart type en grid 2 col agrupados por sección:
  Overview / Analyze / Risk / Forecast, con candado premium y accesibilidad
- Selector de periodo como Picker segmentado nativo en la cabecera del chart
  (fuera del sidebar); título + descripción del chart visibles
- Eliminado sheet de paywall duplicado del layout iPad

Zoom (todas las series temporales):
- Nuevo ChartZoom.swift: pinch + botones +/- y reset (HIG: el gesto nunca es el
  único camino), chartScrollableAxes + chartXVisibleDomain al hacer zoom
- Integrado en Evolution, Contributions, Rolling 12M, Cashflow, Drawdown y Volatility

Focus Mode eliminado (todo siempre disponible):
- Fuera el toggle de Dashboard/Charts/Settings/Onboarding y los 6 @AppStorage
- Todos los chart types siempre visibles; variantes completas en SourceDetail/SourceList
- Home: Total Portfolio Value muestra SIEMPRE el cambio desde el último check-in
- PeriodReturnsCard siempre visible

Rendimiento y bugs (de la auditoría):
- El cache de snapshots ya no se invalida al cambiar solo de chart type/rango/breakdown
- calculateAnnualizedGrowth y el forecast a 12 meses ahora componen (la aproximación
  lineal sobreestimaba con historiales cortos)
- Drawdown sin force unwrap; simulador: rama muerta reemplazada por preservación
  real de las asignaciones simuladas del usuario
- UITest de captura de Charts con manejo del alert de notificaciones

12 strings nuevas localizadas en los 7 idiomas.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015qUZrBusG82T37R7PeokqJ

PortfolioJournal/Views/Dashboard/DashboardView.swift

@@ -11,7 +11,6 @@ struct DashboardView: View {
     @State private var showingAddSource = false
     @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
     @State private var fullScreenSection: DashboardSection? = nil
@@ -103,9 +102,6 @@ struct DashboardView: View {
                         Image(systemName: "slider.horizontal.3")
                     }
                 }
-                ToolbarItem(placement: .navigationBarLeading) {
-                    dashboardFocusModeButton
-                }
             }
             .onAppear {
                 viewModel.selectedAccount = accountStore.selectedAccount
@@ -150,24 +146,6 @@ struct DashboardView: View {
         }
     }
 
-    private var dashboardFocusModeButton: some View {
-        Button {
-            calmModeEnabled.toggle()
-        } label: {
-            HStack(spacing: 4) {
-                Image(systemName: calmModeEnabled ? "moon.stars.fill" : "moon.stars")
-                Text(calmModeEnabled ? "Focus" : "Full")
-                    .font(.caption.weight(.semibold))
-            }
-            .padding(.horizontal, 10)
-            .padding(.vertical, 5)
-            .background(calmModeEnabled ? Color.appPrimary.opacity(0.12) : Color.gray.opacity(0.1))
-            .foregroundColor(calmModeEnabled ? .appPrimary : .secondary)
-            .cornerRadius(14)
-        }
-        .buttonStyle(.plain)
-    }
-
     private var streakBadge: some View {
         HStack(spacing: 6) {
             Image(systemName: "flame.fill")
@@ -354,13 +332,9 @@ struct DashboardView: View {
             } else {
                 TotalValueCard(
                     totalValue: viewModel.portfolioSummary.formattedTotalValue,
-                    changeText: calmModeEnabled
-                        ? "\(viewModel.latestPortfolioChange.formattedAbsolute) (\(viewModel.latestPortfolioChange.formattedPercentage))"
-                        : viewModel.portfolioSummary.formattedDayChange,
-                    changeLabel: calmModeEnabled ? "since last check-in" : "today",
-                    isPositive: calmModeEnabled
-                        ? viewModel.latestPortfolioChange.absolute >= 0
-                        : viewModel.isDayChangePositive,
+                    changeText: "\(viewModel.latestPortfolioChange.formattedAbsolute) (\(viewModel.latestPortfolioChange.formattedPercentage))",
+                    changeLabel: "since last check-in",
+                    isPositive: viewModel.latestPortfolioChange.absolute >= 0,
                     forecast: showForecast ? viewModel.portfolioForecast : nil,
                     isPremium: iapService.isPremium,
                     onUnlockTap: {
@@ -373,10 +347,8 @@ struct DashboardView: View {
                     onShareTap: {
                         ShareService.shared.sharePortfolioValue(
                             totalValue: viewModel.portfolioSummary.formattedTotalValue,
-                            changeText: calmModeEnabled
-                                ? "\(viewModel.latestPortfolioChange.formattedAbsolute) (\(viewModel.latestPortfolioChange.formattedPercentage))"
-                                : viewModel.portfolioSummary.formattedDayChange,
-                            changeLabel: calmModeEnabled ? "since last check-in" : "today",
+                            changeText: "\(viewModel.latestPortfolioChange.formattedAbsolute) (\(viewModel.latestPortfolioChange.formattedPercentage))",
+                            changeLabel: "since last check-in",
                             yearChange: viewModel.portfolioSummary.formattedYearChange,
                             sinceInceptionChange: viewModel.portfolioSummary.formattedAllTimeReturn
                         )
@@ -449,19 +421,17 @@ struct DashboardView: View {
                 PendingUpdatesCard(sources: viewModel.sourcesNeedingUpdate)
             }
         case .periodReturns:
-            if !calmModeEnabled {
-                if config.isCollapsed {
-                    CompactCard(title: "Returns", subtitle: viewModel.portfolioSummary.formattedMonthChange)
-                } else {
-                    PeriodReturnsCard(
-                        monthChange: viewModel.portfolioSummary.formattedMonthChange,
-                        yearChange: viewModel.portfolioSummary.formattedYearChange,
-                        allTimeChange: viewModel.portfolioSummary.formattedAllTimeReturn,
-                        isMonthPositive: viewModel.isMonthChangePositive,
-                        isYearPositive: viewModel.isYearChangePositive,
-                        isAllTimePositive: viewModel.portfolioSummary.allTimeReturn >= 0
-                    )
-                }
+            if config.isCollapsed {
+                CompactCard(title: "Returns", subtitle: viewModel.portfolioSummary.formattedMonthChange)
+            } else {
+                PeriodReturnsCard(
+                    monthChange: viewModel.portfolioSummary.formattedMonthChange,
+                    yearChange: viewModel.portfolioSummary.formattedYearChange,
+                    allTimeChange: viewModel.portfolioSummary.formattedAllTimeReturn,
+                    isMonthPositive: viewModel.isMonthChangePositive,
+                    isYearPositive: viewModel.isYearChangePositive,
+                    isAllTimePositive: viewModel.portfolioSummary.allTimeReturn >= 0
+                )
             }
         case .contributionsVsReturns:
             let contrib = viewModel.portfolioSummary.totalContributions