Fixes UI iPad + diagnóstico iCloud (build 57)

Feedback del usuario en iPad:
- Allocation: gráfica de tarta → semicírculo estilo hemiciclo (parlamento).
  SemicircleAllocation con arcos dibujados a mano (SemicircleArc Shape),
  segmentos por cuota en 180°, total/selección en el centro, tap por segmento.
- Charts de Analyze (Compare, Period vs Period, Year vs Year) ahora SÍ muestran
  KPIs en la cabecera de iPad como el resto: Compare (líder/rezagado por modo),
  Period (retorno final por periodo), YoY (retorno final por año seleccionado).
- Momentum & Streaks en el sidebar del Journal (iPad, 320pt): variante compact
  — tiles en fila sin subtítulos que rompían a 3 líneas, sin bloque de logros.

iCloud:
- CKErrorPartialFailure (CKErrorDomain code 2) mostraba un mensaje opaco.
  CoreDataStack.hint(for:) recorre CKPartialErrorsByItemIDKey y clasifica el
  código dominante → hint accionable (esquema/quota/red). Settings muestra el
  hint legible sobre el detalle técnico. lastSyncErrorHint publicado. Strings ×7.

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

PortfolioJournal/Views/Dashboard/DashboardView.swift

@@ -772,6 +772,9 @@ struct MonthlyCheckInCard: View {
 // MARK: - Momentum & Streaks Card
 
 struct MomentumStreaksCard: View {
+    /// In narrow containers (the Journal sidebar on iPad) the 3-across stat tiles
+    /// and achievement detail don't fit — stack tiles in a grid and drop detail.
+    var compact = false
     @State private var stats: MonthlyCheckInStats = .empty
 
     var body: some View {
@@ -791,22 +794,30 @@ struct MomentumStreaksCard: View {
                 }
             }
 
-            HStack(spacing: 12) {
-                statTile(
-                    title: "Streak",
-                    value: "\(stats.currentStreak)x",
-                    subtitle: "On-time in a row"
-                )
-                statTile(
-                    title: "Best",
-                    value: "\(stats.bestStreak)x",
-                    subtitle: "Personal best"
-                )
-                statTile(
-                    title: "Avg early",
-                    value: formattedDaysText(for: stats.averageDaysBeforeDeadline),
-                    subtitle: "vs deadline"
-                )
+            if compact {
+                HStack(spacing: 8) {
+                    compactStatTile(title: "Streak", value: "\(stats.currentStreak)x")
+                    compactStatTile(title: "Best", value: "\(stats.bestStreak)x")
+                    compactStatTile(title: "Avg early", value: formattedDaysText(for: stats.averageDaysBeforeDeadline))
+                }
+            } else {
+                HStack(spacing: 12) {
+                    statTile(
+                        title: "Streak",
+                        value: "\(stats.currentStreak)x",
+                        subtitle: "On-time in a row"
+                    )
+                    statTile(
+                        title: "Best",
+                        value: "\(stats.bestStreak)x",
+                        subtitle: "Personal best"
+                    )
+                    statTile(
+                        title: "Avg early",
+                        value: formattedDaysText(for: stats.averageDaysBeforeDeadline),
+                        subtitle: "vs deadline"
+                    )
+                }
             }
 
             ProgressView(value: stats.onTimeRate, total: 1)
@@ -839,7 +850,7 @@ struct MomentumStreaksCard: View {
                     .foregroundColor(.secondary)
             }
 
-            if !stats.achievements.isEmpty {
+            if !stats.achievements.isEmpty && !compact {
                 VStack(alignment: .leading, spacing: 8) {
                     Text(String(localized: "achievements_title"))
                         .font(.subheadline.weight(.semibold))
@@ -887,6 +898,25 @@ struct MomentumStreaksCard: View {
         stats = MonthlyCheckInStore.stats(referenceDate: Date())
     }
 
+    @ViewBuilder
+    private func compactStatTile(title: String, value: String) -> some View {
+        VStack(spacing: 2) {
+            Text(value)
+                .font(.headline)
+                .minimumScaleFactor(0.7)
+                .lineLimit(1)
+            Text(title)
+                .font(.caption2)
+                .foregroundColor(.secondary)
+                .lineLimit(1)
+                .minimumScaleFactor(0.8)
+        }
+        .frame(maxWidth: .infinity)
+        .padding(.vertical, 10)
+        .background(Color.gray.opacity(0.08))
+        .cornerRadius(AppConstants.UI.smallCornerRadius)
+    }
+
     @ViewBuilder
     private func statTile(title: String, value: String, subtitle: String) -> some View {
         VStack(alignment: .leading, spacing: 4) {