1.6.0: auto-rellenar huecos (snapshots estimados) + widgets/lock screen enriquecidos

Auto-relleno (#5): SnapshotRepository.autoFillGap crea snapshots interpolados
linealmente entre los dos snapshots que bordean el hueco, marcados isEstimated.
deleteEstimatedSnapshots para borrado en bloque. Botón 'Autocompletar N meses'
(wand.and.stars) en DataGapsSheet + 'Añadir manualmente'. Idempotente. Strings 7 idiomas.

Widgets/Lock Screen (#8, vía agente): familias enriquecidas — systemSmall/Medium/Large
con net worth + cambio desde check-in + racha + próximo check-in + progreso de objetivo;
lock screen accessoryCircular (gauge objetivo/milestone), accessoryRectangular, accessoryInline.
Deep link quickupdate preservado. Solo InvestmentWidget.swift.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L2p3gUZRNWW388rWFRjiU7

PortfolioJournal/Views/Dashboard/DataGapsView.swift

@@ -62,6 +62,8 @@ struct DataGapsSheet: View {
 
     @Environment(\.dismiss) private var dismiss
     @State private var fillTarget: FillTarget?
+    @State private var filledGapIds: Set<String> = []
+    private let snapshotRepository = SnapshotRepository()
 
     private struct FillTarget: Identifiable {
         let source: InvestmentSource
@@ -69,15 +71,19 @@ struct DataGapsSheet: View {
         var id: String { "\(source.id.uuidString)-\(date.timeIntervalSince1970)" }
     }
 
+    private var visibleGaps: [SnapshotGapDetector.Gap] {
+        gaps.filter { !filledGapIds.contains($0.id) }
+    }
+
     var body: some View {
         NavigationStack {
             List {
                 Section {
-                    ForEach(gaps) { gap in
+                    ForEach(visibleGaps) { gap in
                         gapRow(gap)
                     }
                 } footer: {
-                    Text("The chart estimates these months. Add real snapshots to keep your history accurate.")
+                    Text("Auto-fill estimates the missing months between two snapshots (marked as estimated). Or add the real values yourself.")
                 }
             }
             .navigationTitle("Missing Data")
@@ -116,14 +122,34 @@ struct DataGapsSheet: View {
 
             if let source = sourceProvider(gap.sourceId),
                let firstMissing = gap.missingMonthDates.first {
-                Button {
-                    fillTarget = FillTarget(source: source, date: firstMissing)
-                } label: {
-                    Label("Fill Gap", systemImage: "plus.circle.fill")
+                HStack(spacing: 16) {
+                    Button {
+                        let n = snapshotRepository.autoFillGap(
+                            source: source,
+                            from: gap.fromMonth,
+                            to: gap.toMonth,
+                            missingMonthDates: gap.missingMonthDates
+                        )
+                        if n > 0 { filledGapIds.insert(gap.id) }
+                    } label: {
+                        Label(
+                            String(format: String(localized: "gaps_autofill_cta"), gap.missingMonths),
+                            systemImage: "wand.and.stars"
+                        )
                         .font(.subheadline.weight(.semibold))
+                    }
+                    .buttonStyle(.borderless)
+                    .tint(.appPrimary)
+
+                    Button {
+                        fillTarget = FillTarget(source: source, date: firstMissing)
+                    } label: {
+                        Label("Add manually", systemImage: "plus.circle")
+                            .font(.subheadline)
+                    }
+                    .buttonStyle(.borderless)
+                    .tint(.secondary)
                 }
-                .buttonStyle(.borderless)
-                .tint(.appPrimary)
             }
         }
         .padding(.vertical, 4)