premium: configurar días y comidas de una semana concreta

Hasta ahora includeWeekends y activeMealTypes vivían solo en AppSettings y
aplicaban a todo el calendario. WeekPlan puede ahora sobreescribirlos para su
semana (includeWeekendsOverride / mealTypesOverrideRaw) y WeekSchedule resuelve
qué manda en cada semana: su override si lo tiene, los ajustes globales si no.

Todo lo que pintaba días y comidas —planificador, exports, compartir texto,
widget, watch— pasa por settings.schedule(for:), así que una semana con fin de
semana añadido o con desayuno activo se ve igual en todas partes.

Crear o editar el override es premium; los ya guardados se respetan aunque la
suscripción caduque, para no borrar comidas ya planificadas. La hoja avisa y
pide confirmación cuando quitar un día o una comida se lleva por delante algo
ya planificado.

Refs #32

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013su1ttRiMeMYxkZJ1Y3246

MealMood/Models/WeekPlan.swift

@@ -12,6 +12,13 @@ final class WeekPlan {
     var updatedAt: Date = Date()
     var userRating: Int = 0   // 0 = unrated, 1 = liked, -1 = disliked
 
+    /// Per-week overrides of the global schedule (2.1.1, premium). nil = follow
+    /// `AppSettings`. Optional so existing stores lightweight-migrate and
+    /// CloudKit accepts the new attributes.
+    var includeWeekendsOverride: Bool?
+    /// Comma-separated MealType raw values, chronological. nil = follow settings.
+    var mealTypesOverrideRaw: String?
+
     @Relationship(deleteRule: .cascade)
     var slots: [MealSlot]? = []
 
@@ -21,6 +28,36 @@ final class WeekPlan {
         set { slots = newValue }
     }
 
+    /// The meal types this week overrides the global setting with, or nil when
+    /// it follows `AppSettings.activeMealTypes`.
+    var mealTypesOverride: [MealType]? {
+        get {
+            guard let raw = mealTypesOverrideRaw else { return nil }
+            let types = raw.split(separator: ",").compactMap { MealType(rawValue: String($0)) }
+            guard !types.isEmpty else { return nil }
+            return MealType.allCases.filter { types.contains($0) }
+        }
+        set {
+            guard let newValue else {
+                mealTypesOverrideRaw = nil
+                return
+            }
+            let ordered = MealType.allCases.filter { newValue.contains($0) }
+            // An empty selection would leave the week with no slots at all;
+            // treat it as "no override" instead.
+            mealTypesOverrideRaw = ordered.isEmpty ? nil : ordered.map(\.rawValue).joined(separator: ",")
+        }
+    }
+
+    var hasScheduleOverride: Bool {
+        includeWeekendsOverride != nil || mealTypesOverrideRaw != nil
+    }
+
+    func clearScheduleOverride() {
+        includeWeekendsOverride = nil
+        mealTypesOverrideRaw = nil
+    }
+
     init(
         id: UUID = UUID(),
         weekStartDate: Date,