2.0: fix crash de arranque por IDs duplicados (CloudKit)

Fatal error "Duplicate values for key" al construir diccionarios con
Dictionary(uniqueKeysWithValues:) sobre dishes/tags/slots cuyos UUID se
duplican por la sincronización CloudKit de 2.0. Se sustituyen todas las
ocurrencias por Dictionary(_, uniquingKeysWith:) para tolerar duplicados
(se conserva el primero) en lugar de abortar. La app ya no crashea al
abrir con datos duplicados; la deduplicación real queda pendiente aparte.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A3HaWmmtTQ1vdTERtSYU6p

MealMood/ViewModels/HomeViewModel.swift

@@ -352,9 +352,9 @@ final class HomeViewModel: ObservableObject {
     private func captureUndoSnapshot(plan: WeekPlan) {
         guard !isApplyingUndo else { return }
         lastWeekStartSnapshot = plan.weekStartDate
-        lastSlotsSnapshot = Dictionary(uniqueKeysWithValues: plan.slotList.map { slot in
+        lastSlotsSnapshot = Dictionary(plan.slotList.map { slot in
             (slot.id, SlotSnapshot(dishId: slot.dishId, isRuleOverridden: slot.isRuleOverridden, isEatingOut: slot.isEatingOut))
-        })
+        }, uniquingKeysWith: { first, _ in first })
         hasUndoSnapshot = true
     }
 
@@ -410,7 +410,7 @@ final class HomeViewModel: ObservableObject {
     }
 
     private func syncAllAssignedSlotsToCalendar(plan: WeekPlan, dishes: [Dish], settings: AppSettings) {
-        let dishById = Dictionary(uniqueKeysWithValues: dishes.map { ($0.id, $0) })
+        let dishById = Dictionary(dishes.map { ($0.id, $0) }, uniquingKeysWith: { first, _ in first })
         for slot in plan.slotList {
             guard let dishId = slot.dishId, let dish = dishById[dishId] else {
                 if let eventId = slot.calendarEventId {