1.4.1 (build 42): contribución por snapshot, fixes Period vs Period y navegación iPad

- 151: contribución editable por snapshot en cualquier modo (quitado gate detailed)
  con diálogo de propagación al editar: solo este / adelante / atrás / todos
  (SnapshotRepository.propagateContribution, SnapshotFormViewModel.contributionChanged)
- 148: Period vs Period mostraba mal el último mes del period B — la agrupación usaba
  chartMonth(for:) que aplicaba el grace-period del check-in a snapshots históricos;
  ahora agrupa por mes calendario crudo
- 152: iPad Sources no saltaba entre fuentes — añadido .id() al SourceDetailView para
  recrear el StateObject al cambiar de selección
- 146/147: Year vs Year con forecast del año en curso (asterisco de estimado) y KPIs
  arriba / detalle debajo
- 145: card de contribución mensual en SourceDetailView
- Nuevas claves snapshot_contribution_propagate_* en los 7 idiomas

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

PortfolioJournalWidget/InvestmentWidget.swift

@@ -74,6 +74,8 @@ struct InvestmentWidgetEntry: TimelineEntry {
     let categoryTotals: [(name: String, value: Decimal, color: String)]
     let goals: [GoalSummary]
     let currencyCode: String
+    let insightTitle: String
+    let insightValue: String
 }
 
 struct CategorySeries: Identifiable {
@@ -139,7 +141,9 @@ struct InvestmentWidgetProvider: TimelineProvider {
             goals: [
                 GoalSummary(name: "Target", targetAmount: 75000, targetDate: nil)
             ],
-            currencyCode: "EUR"
+            currencyCode: "EUR",
+            insightTitle: "Milestone ahead",
+            insightValue: "€5K from €50K"
         )
     }
 
@@ -176,7 +180,9 @@ struct InvestmentWidgetProvider: TimelineProvider {
                 categoryEvolution: [],
                 categoryTotals: [],
                 goals: [],
-                currencyCode: currencyCode
+                currencyCode: currencyCode,
+                insightTitle: "",
+                insightValue: ""
             )
         }
 
@@ -362,6 +368,41 @@ struct InvestmentWidgetProvider: TimelineProvider {
             }
         }
 
+        // Compute top insight
+        var insightTitle = ""
+        var insightValue = ""
+
+        // Milestone approaching
+        let milestones: [Double] = [1000, 2500, 5000, 10000, 25000, 50000, 100000, 250000, 500000, 1_000_000]
+        let totalDouble = NSDecimalNumber(decimal: totalValue).doubleValue
+        if let nextMs = milestones.first(where: { $0 > totalDouble }) {
+            let pct = totalDouble / nextMs
+            if pct >= 0.90 {
+                let gap = nextMs - totalDouble
+                let formatter = NumberFormatter()
+                formatter.numberStyle = .currency
+                formatter.currencyCode = currencyCode
+                formatter.maximumFractionDigits = 0
+                let msStr = formatter.string(from: NSNumber(value: nextMs)) ?? ""
+                let gapStr = formatter.string(from: NSNumber(value: gap)) ?? ""
+                insightTitle = "Milestone ahead"
+                insightValue = "\(gapStr) from \(msStr)"
+            }
+        }
+
+        // Year performance (only if no milestone insight)
+        if insightTitle.isEmpty && !trendPoints.isEmpty && trendPoints.count >= 2 {
+            let first = NSDecimalNumber(decimal: trendPoints.first!).doubleValue
+            let last = NSDecimalNumber(decimal: trendPoints.last!).doubleValue
+            if first > 0 {
+                let pct = (last - first) / first * 100
+                if abs(pct) >= 1 {
+                    insightTitle = "Year to date"
+                    insightValue = String(format: "%+.1f%%", pct)
+                }
+            }
+        }
+
         return InvestmentWidgetEntry(
             date: Date(),
             isPremium: isPremium,
@@ -374,7 +415,9 @@ struct InvestmentWidgetProvider: TimelineProvider {
             categoryEvolution: categoryEvolution,
             categoryTotals: categoryTotalsData.map { (name: $0.name, value: $0.value, color: $0.color) },
             goals: goals,
-            currencyCode: currencyCode
+            currencyCode: currencyCode,
+            insightTitle: insightTitle,
+            insightValue: insightValue
         )
     }
 }
@@ -498,6 +541,23 @@ struct MediumWidgetView: View {
                         }
                     }
                 }
+
+                if !entry.insightTitle.isEmpty {
+                    HStack(spacing: 4) {
+                        Image(systemName: "lightbulb.fill")
+                            .font(.caption2)
+                            .foregroundColor(.orange)
+                        VStack(alignment: .leading, spacing: 0) {
+                            Text(entry.insightTitle)
+                                .font(.caption2)
+                                .foregroundColor(.secondary)
+                            Text(entry.insightValue)
+                                .font(.caption.weight(.semibold))
+                                .foregroundColor(.primary)
+                                .lineLimit(1)
+                        }
+                    }
+                }
             }
         }
         .padding()
@@ -930,7 +990,9 @@ struct PortfolioJournalWidgetBundle: WidgetBundle {
             categoryEvolution: [],
             categoryTotals: [],
             goals: [],
-            currencyCode: "EUR"
+            currencyCode: "EUR",
+            insightTitle: "",
+            insightValue: ""
         )
 }
 
@@ -953,7 +1015,9 @@ struct PortfolioJournalWidgetBundle: WidgetBundle {
             categoryEvolution: [],
             categoryTotals: [],
             goals: [],
-            currencyCode: "EUR"
+            currencyCode: "EUR",
+            insightTitle: "Year to date",
+            insightValue: "+12.4%"
         )
 }
 
@@ -1004,7 +1068,9 @@ struct PortfolioJournalWidgetBundle: WidgetBundle {
             goals: [
                 GoalSummary(name: "Target", targetAmount: 120000, targetDate: nil)
             ],
-            currencyCode: "EUR"
+            currencyCode: "EUR",
+            insightTitle: "Milestone ahead",
+            insightValue: "€5K from €100K"
         )
 }
 extension Decimal {