Feedback TestFlight build 58 (build 59): labels, needs-update, period selector, Home masonry

De 7 comentarios de TestFlight:
- Labels de línea ilegibles (puntos 5+7): ChartLabels.showsLabel thin-out
  (máx 5 iPhone / 8 iPad, siempre primero y último). Charts multi-serie
  (Compare, Period, Year vs Year) etiquetan solo el ENDPOINT de cada serie.
  Prediction etiqueta solo el forecast final. Aplicado a Evolution, Rolling,
  Drawdown, Volatility, Compare, Period, YoY, Prediction.
- 'Needs update' en meses pasados (punto 2): MonthlyCheckInView.snapshotForViewedMonth
  — el estado es por el MES QUE SE VE (effective month de referenceDate), no
  contra la última completion global. Diff usa el snapshot de ese mes.
- Selector de periodo Performance (punto 6): slider 1..60 → picker segmentado
  consistente con el resto, opciones capadas a los meses de datos disponibles
  (availableHistoryMonths). Ya no deja pedir ventanas sin datos.
- Home iPad/Mac (feedback previo): masonry con nº de columnas según ancho
  (2 iPad / 3 Mac ancho >=1250), reparto por peso, propio ScrollView.

Pendiente de este lote: Goals no sincronizan (verificado modelo Goal CloudKit-OK
→ es el subset del partial-failure, no filtro ni esquema; necesita códigos
internos del error), paste/OCR por campo (punto 3) y swipe entre charts (punto 4).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WoScpmHdVj1aUf4rAp6hbe

PortfolioJournal/Views/Charts/PredictionChartView.swift

@@ -5,10 +5,9 @@ struct PredictionChartView: View {
     let predictions: [Prediction]
     let historicalData: [(date: Date, value: Decimal)]
     @State private var selectedDate: Date?
+    @Environment(\.horizontalSizeClass) private var labelsSizeClass
 
-    private var showAllLabels: Bool {
-        historicalData.count + predictions.count <= ChartLabels.alwaysShowThreshold
-    }
+    private var labelsCompact: Bool { labelsSizeClass != .regular }
 
     /// Nearest point (historical or predicted) to the selected date.
     private var selectedPoint: (date: Date, value: Decimal, isPrediction: Bool)? {
@@ -49,8 +48,9 @@ struct PredictionChartView: View {
 
             if !predictions.isEmpty && historicalData.count >= 2 {
                 Chart {
-                    // Historical data
-                    ForEach(historicalData, id: \.date) { item in
+                    // Historical data — thin labels to at most a handful.
+                    ForEach(Array(historicalData.enumerated()), id: \.element.date) { pair in
+                        let item = pair.element
                         LineMark(
                             x: .value("Date", item.date),
                             y: .value("Value", NSDecimalNumber(decimal: item.value).doubleValue)
@@ -63,9 +63,9 @@ struct PredictionChartView: View {
                             y: .value("Value", NSDecimalNumber(decimal: item.value).doubleValue)
                         )
                         .foregroundStyle(Color.appPrimary)
-                        .symbolSize(showAllLabels ? 36 : 24)
+                        .symbolSize(24)
                         .annotation(position: .top, spacing: 3) {
-                            if showAllLabels {
+                            if ChartLabels.showsLabel(index: pair.offset, count: historicalData.count, compact: labelsCompact) {
                                 ChartValueBubble(text: item.value.compactCurrencyString)
                             }
                         }
@@ -95,9 +95,10 @@ struct PredictionChartView: View {
                             y: .value("Predicted", NSDecimalNumber(decimal: prediction.predictedValue).doubleValue)
                         )
                         .foregroundStyle(Color.appSecondary)
-                        .symbolSize(showAllLabels ? 36 : 24)
+                        .symbolSize(prediction.id == predictions.last?.id ? 34 : 24)
                         .annotation(position: .top, spacing: 3) {
-                            if showAllLabels {
+                            // Only the final forecast point (the KPIs cover the rest).
+                            if prediction.id == predictions.last?.id {
                                 ChartValueBubble(text: prediction.predictedValue.compactCurrencyString, color: .appSecondary)
                             }
                         }