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

PortfolioJournal/Services/NotificationService.swift

@@ -219,14 +219,28 @@ extension NotificationService {
         }
     }
 
-    /// Schedules a monthly check-in notification on the 1st of each month at 9am.
-    /// Only schedules if not already pending.
+    /// Schedules a non-repeating monthly check-in notification for the 1st of the next month
+    /// that doesn't have a completed check-in. Safe to call on every app activation.
     func scheduleMonthlyCheckIn() {
         guard isAuthorized else { return }
 
         let identifier = "monthly_checkin"
-        center.getPendingNotificationRequests { [weak self] requests in
-            guard let self, !requests.contains(where: { $0.identifier == identifier }) else { return }
+        center.removePendingNotificationRequests(withIdentifiers: [identifier])
+
+        let calendar = Calendar.current
+        let now = Date()
+        guard let thisMonthStart = calendar.date(from: calendar.dateComponents([.year, .month], from: now)) else { return }
+
+        // Walk forward from next month to find the first month whose check-in is not done
+        for offset in 1...13 {
+            guard let targetStart = calendar.date(byAdding: .month, value: offset, to: thisMonthStart) else { break }
+            let isDone = MonthlyCheckInStore.completionDate(for: targetStart.adding(days: 1)) != nil
+            if isDone { continue }
+
+            var components = calendar.dateComponents([.year, .month], from: targetStart)
+            components.day = 1
+            components.hour = 9
+            components.minute = 0
 
             let content = UNMutableNotificationContent()
             content.title = String(localized: "monthly_checkin_notification_title")
@@ -234,19 +248,15 @@ extension NotificationService {
             content.sound = .default
             content.userInfo = ["action": "batchUpdate"]
 
-            var components = DateComponents()
-            components.day = 1
-            components.hour = 9
-            components.minute = 0
-
-            let trigger = UNCalendarNotificationTrigger(dateMatching: components, repeats: true)
+            let trigger = UNCalendarNotificationTrigger(dateMatching: components, repeats: false)
             let request = UNNotificationRequest(identifier: identifier, content: content, trigger: trigger)
 
-            self.center.add(request) { error in
+            center.add(request) { error in
                 if let error = error {
                     print("Monthly check-in notification error: \(error)")
                 }
             }
+            return
         }
     }
 
@@ -299,6 +309,42 @@ extension NotificationService {
             }
         }
     }
+
+    /// Fires a notification when the portfolio crosses a round milestone for the first time.
+    func checkAndScheduleMilestoneNotification(portfolioValue: Decimal) {
+        guard isAuthorized else { return }
+
+        let milestones: [Decimal] = [1000, 2500, 5000, 10000, 25000, 50000,
+                                      100000, 250000, 500000, 1_000_000]
+        let notifiedKey = "lastNotifiedMilestone"
+        let lastNotified = UserDefaults.standard.double(forKey: notifiedKey)
+        let current = NSDecimalNumber(decimal: portfolioValue).doubleValue
+
+        for milestone in milestones.reversed() {
+            let ms = NSDecimalNumber(decimal: milestone).doubleValue
+            if current >= ms {
+                if ms > lastNotified {
+                    UserDefaults.standard.set(ms, forKey: notifiedKey)
+                    let milestoneStr = CurrencyFormatter.format(milestone, style: .currency, maximumFractionDigits: 0)
+
+                    let content = UNMutableNotificationContent()
+                    content.title = String(localized: "notification_milestone_title")
+                    content.body = String(format: String(localized: "notification_milestone_body"), milestoneStr)
+                    content.sound = .default
+                    content.userInfo = ["action": "openDashboard"]
+
+                    let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 1, repeats: false)
+                    let request = UNNotificationRequest(
+                        identifier: "portfolio_milestone_\(Int(ms))",
+                        content: content,
+                        trigger: trigger
+                    )
+                    center.add(request) { _ in }
+                }
+                break
+            }
+        }
+    }
 }
 
 // MARK: - Background Refresh