reviews: pedir valoracion tras la compra y deep link write-review en ajustes

- Tras una compra exitosa se pide la review nativa (una vez por usuario,
  con 2s de delay para que se vea el estado premium activo)
- El boton de ajustes abre el formulario de resena del App Store via
  ?action=write-review en vez de SKStoreReviewController, que Apple
  limita a 3 prompts/ano y el resto de veces no muestra nada
- Evento analytics review_prompt_post_purchase para medirlo

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013H6bXqGX1ygwib1Dm3n3UG

MealMood/Services/ReviewPromptService.swift

@@ -7,11 +7,31 @@ final class ReviewPromptService {
 
     private let reviewCompletedKey = "review_funnel_completed"
     private let lastPromptedCompletedWeeksKey = "review_funnel_last_prompted_completed_weeks"
+    private let postPurchaseAskedKey = "review_post_purchase_asked"
     private let minimumCompletedWeeksToStart = 1
     private let promptIntervalWeeks = 2
 
+    /// Write-review deep link: always opens the App Store review form, unlike
+    /// `SKStoreReviewController` which Apple throttles to 3 prompts/year and
+    /// silently no-ops the rest of the time.
+    static let writeReviewURL = URL(string: "https://apps.apple.com/app/id6759255553?action=write-review")!
+
     private init() {}
 
+    /// Asks for a rating right after a successful subscription purchase — the
+    /// user just paid, so sentiment is at its peak. Once per user; the small
+    /// delay lets the "premium active" state render before the system alert.
+    func requestAfterPurchase() {
+        guard !UserDefaults.standard.bool(forKey: postPurchaseAskedKey) else { return }
+        UserDefaults.standard.set(true, forKey: postPurchaseAskedKey)
+        AnalyticsService.logEvent("review_prompt_post_purchase")
+        Task { @MainActor in
+            try? await Task.sleep(for: .seconds(2))
+            requestReview()
+            markReviewCompleted()
+        }
+    }
+
     func shouldShowFunnelAfterWeekCompletion(completedWeeks: Int) -> Bool {
         guard !hasCompletedReviewFlow else { return false }
         guard completedWeeks >= minimumCompletedWeeksToStart else { return false }
@@ -29,10 +49,6 @@ final class ReviewPromptService {
         UserDefaults.standard.set(true, forKey: reviewCompletedKey)
     }
 
-    func requestFromSettings() {
-        requestReview()
-    }
-
     var hasCompletedReviewFlow: Bool {
         UserDefaults.standard.bool(forKey: reviewCompletedKey)
     }

MealMood/Views/Premium/PremiumView.swift

@@ -356,6 +356,7 @@ struct PremiumView: View {
                 AnalyticsService.logFreeTrialStarted(plan: product.id)
             }
             try? context.save()
+            ReviewPromptService.shared.requestAfterPurchase()
         case .pending:
             purchaseStatusMessageKey = "premium_purchase_pending"
         case .cancelled:

MealMood/Views/Settings/SettingsView.swift

@@ -270,9 +270,7 @@ struct SettingsView: View {
             .listRowBackground(Color.mealMoodSurface)
 
             Section {
-                Button {
-                    ReviewPromptService.shared.requestFromSettings()
-                } label: {
+                Link(destination: ReviewPromptService.writeReviewURL) {
                     Label("settings_rate_app", systemImage: "star.bubble")
                 }