Charts: puntos + labels de valor en todas las gráficas de líneas

- Nuevo ChartValueLabels.swift: ChartValueBubble (cápsula) y ChartSelectionCard
  (tarjeta multi-serie), con umbral compartido (<=12 puntos → labels SIEMPRE
  visibles; las gráficas cortas aportan mucho más con los valores a la vista)
- PointMark añadido donde faltaba (Compare, Year vs Year, Drawdown, Volatility);
  agrandado donde ya existía (Evolution, Prediction, Period vs Period, Rolling)
- Selección por tap/arrastre (chartXSelection) en las 8 gráficas: RuleMark + burbuja
  prominente (una serie) o tarjeta con el valor de cada serie (multi-serie)
- Evolution reutiliza su scrubbing existente y ahora muestra burbuja en el punto
- Period vs Period: labels A arriba / B abajo para evitar solapes
- Drawdown/Volatility migrados de Chart(data:) a Chart{ForEach} para poder añadir
  marcas de selección

Verificado en iPad Pro 13" (labels visibles en Evolution y Period vs Period).

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

PortfolioJournal/Views/Charts/ChartsContainerView.swift

@@ -999,7 +999,12 @@ struct EvolutionChartView: View {
                     y: .value("Value", NSDecimalNumber(decimal: item.value).doubleValue)
                 )
                 .foregroundStyle(Color.appPrimary)
-                .symbolSize(30)
+                .symbolSize(data.count <= ChartLabels.alwaysShowThreshold ? 40 : 30)
+                .annotation(position: .top, spacing: 3) {
+                    if data.count <= ChartLabels.alwaysShowThreshold {
+                        ChartValueBubble(text: item.value.compactCurrencyString)
+                    }
+                }
 
                 AreaMark(
                     x: .value("Date", item.date),
@@ -1049,6 +1054,22 @@ struct EvolutionChartView: View {
                     .lineStyle(StrokeStyle(lineWidth: 1, dash: [6, 4]))
             }
         }
+
+        // Scrub/tap selection bubble (total mode)
+        if chartMode == .total, let sel = selectedDataPoint {
+            RuleMark(x: .value("Selected", sel.date))
+                .foregroundStyle(Color.secondary.opacity(0.35))
+                .lineStyle(StrokeStyle(lineWidth: 1, dash: [3, 3]))
+            PointMark(
+                x: .value("Selected", sel.date),
+                y: .value("Value", NSDecimalNumber(decimal: sel.value).doubleValue)
+            )
+            .foregroundStyle(Color.appPrimary)
+            .symbolSize(80)
+            .annotation(position: .top, spacing: 4) {
+                ChartValueBubble(text: sel.value.compactCurrencyString, prominent: true)
+            }
+        }
     }
 
     private var chartCategoryNames: [String] {
@@ -1139,6 +1160,15 @@ struct ContributionsChartView: View {
 struct RollingReturnChartView: View {
     let data: [(date: Date, value: Double)]
     @State private var zoom = ChartZoomModel()
+    @State private var selectedDate: Date?
+
+    private var showAllLabels: Bool { data.count <= ChartLabels.alwaysShowThreshold }
+    private var selectedPoint: (date: Date, value: Double)? {
+        guard let selectedDate else { return nil }
+        return data.min(by: {
+            abs($0.date.timeIntervalSince(selectedDate)) < abs($1.date.timeIntervalSince(selectedDate))
+        })
+    }
 
     var body: some View {
         VStack(alignment: .leading, spacing: 12) {
@@ -1164,9 +1194,30 @@ struct RollingReturnChartView: View {
                             y: .value("Return", item.value)
                         )
                         .foregroundStyle(Color.appPrimary)
-                        .symbolSize(24)
+                        .symbolSize(showAllLabels ? 36 : 24)
+                        .annotation(position: item.value >= 0 ? .top : .bottom, spacing: 3) {
+                            if showAllLabels {
+                                ChartValueBubble(text: ChartLabels.percent(item.value))
+                            }
+                        }
+                    }
+
+                    if let sel = selectedPoint {
+                        RuleMark(x: .value("Selected", sel.date))
+                            .foregroundStyle(Color.secondary.opacity(0.35))
+                            .lineStyle(StrokeStyle(lineWidth: 1, dash: [3, 3]))
+                        PointMark(
+                            x: .value("Selected", sel.date),
+                            y: .value("Return", sel.value)
+                        )
+                        .foregroundStyle(Color.appPrimary)
+                        .symbolSize(70)
+                        .annotation(position: sel.value >= 0 ? .top : .bottom, spacing: 4) {
+                            ChartValueBubble(text: ChartLabels.percent(sel.value), prominent: true)
+                        }
                     }
                 }
+                .chartXSelection(value: $selectedDate)
                 .chartXAxis {
                     AxisMarks(values: .stride(by: .month, count: 2)) { value in
                         AxisValueLabel(format: .dateTime.month(.abbreviated))