Dashboard: quitar títulos duplicados en cards de gráficas (build 81) #33

showsTitle (default true) en HorizontalPerformanceChart, DrawdownChart,
VolatilityChartView, PredictionChartView y YearOverYearChartView; el
pageContent del Dashboard pasa false porque el header de la card ya nombra
la página. La sección Charts no cambia.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L38583J7AYWCVPevkivscj

PortfolioJournal/Views/Charts/PerformanceBarChart.swift

@@ -185,6 +185,8 @@ struct PerformanceBarChart: View {
 
 struct HorizontalPerformanceChart: View {
     let data: [(category: String, cagr: Double, color: String)]
+    /// Hidden when the host (e.g. a dashboard card) already shows a title.
+    var showsTitle: Bool = true
 
     var sortedData: [(category: String, cagr: Double, color: String)] {
         data.sorted { $0.cagr > $1.cagr }
@@ -196,8 +198,10 @@ struct HorizontalPerformanceChart: View {
 
     var body: some View {
         VStack(alignment: .leading, spacing: 16) {
-            Text("Performance by Category")
-                .font(.headline)
+            if showsTitle {
+                Text("Performance by Category")
+                    .font(.headline)
+            }
 
             ForEach(sortedData, id: \.category) { item in
                 VStack(alignment: .leading, spacing: 4) {