reglas: plato fijo por dia y comida (ej. tortilla los viernes de cena)

- Dish.fixedDayOfWeek/fixedMealType (opcionales, aditivos para CloudKit)
- Toggle + pickers de dia/comida en el formulario de plato
- AutocompleteEngine: pre-pasada que asigna los platos fijos a su hueco
  antes del bucle MRV, de modo que cuentan para el resto de reglas
- Evento analytics dish_fixed_slot_set; strings en 6 idiomas

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

MealMood/Views/Dishes/DishFormView.swift

@@ -27,6 +27,12 @@ struct DishFormView: View {
         (allSettings.first?.languageEnum ?? .system).resolved()
     }
 
+    /// Localized weekday name for the app's 0=Monday … 6=Sunday convention.
+    static func weekdayName(_ day: Int) -> String {
+        let symbols = Calendar.current.standaloneWeekdaySymbols // [0]=Sunday
+        return symbols[(day + 1) % 7].capitalized
+    }
+
     private var reachedFreeDishLimit: Bool {
         guard let settings = allSettings.first else { return false }
         if viewModel.isEditing { return false }
@@ -290,6 +296,54 @@ struct DishFormView: View {
                         .background(Color.mealMoodSurface)
                         .cornerRadius(14)
 
+                        // Fixed-slot rule ("tortilla every Friday dinner")
+                        VStack(alignment: .leading, spacing: 10) {
+                            Toggle(isOn: Binding(
+                                get: { viewModel.hasFixedSlot },
+                                set: { viewModel.hasFixedSlot = $0 }
+                            )) {
+                                VStack(alignment: .leading, spacing: 2) {
+                                    HStack(spacing: 6) {
+                                        Image(systemName: "pin.fill")
+                                            .foregroundColor(.mealMoodCoral)
+                                            .font(.system(size: 13))
+                                        Text("dish_fixed_slot")
+                                            .font(.mealMoodBodyBold)
+                                            .foregroundColor(.mealMoodTextPrimary)
+                                    }
+                                    Text("dish_fixed_slot_desc")
+                                        .font(.mealMoodCaption)
+                                        .foregroundColor(.mealMoodTextSecondary)
+                                }
+                            }
+                            .tint(.mealMoodCoral)
+
+                            if viewModel.hasFixedSlot {
+                                HStack(spacing: 12) {
+                                    Picker("dish_fixed_slot_day", selection: Binding(
+                                        get: { viewModel.fixedDayOfWeek },
+                                        set: { viewModel.fixedDayOfWeek = $0 }
+                                    )) {
+                                        ForEach(0..<7, id: \.self) { day in
+                                            Text(Self.weekdayName(day)).tag(day)
+                                        }
+                                    }
+                                    Picker("dish_fixed_slot_meal", selection: Binding(
+                                        get: { viewModel.fixedMealType },
+                                        set: { viewModel.fixedMealType = $0 }
+                                    )) {
+                                        ForEach(allSettings.first?.activeMealTypes ?? MealType.allCases, id: \.self) { meal in
+                                            Text(LocalizedStringKey(meal.localizedKey)).tag(meal)
+                                        }
+                                    }
+                                }
+                                .pickerStyle(.menu)
+                                .tint(.mealMoodCoral)
+                            }
+                        }
+                        .padding(16)
+                        .background(Color.mealMoodSurface)
+                        .cornerRadius(14)
 
                         // Delete button (edit mode only)
                         if viewModel.isEditing {