2.0: breakfast and snack meal types across the app

- MealType gains breakfast/snack (chronological order drives slot/row order).
- AppSettings.activeMealTypes: single source of truth for enabled meals, backed
  by new optional enabledMealTypesRaw with legacy mealWindows fallback —
  additive migration, keeps pre-2.0 installs and iCloud snapshots working.
  Legacy field kept coherent by the setter. time(for:) resolves per-meal event
  times (breakfast 8:00 / snack 17:00 defaults on old stores).
- Replaced the 5 duplicated mealWindows→[MealType] derivations (slot sync,
  default plan creation, week calendar, export view) with activeMealTypes.
- CalendarService: per-type event names and times.
- Export styles: per-type accent colors and gradients.
- Widget: generic meals list (N rows) instead of hardcoded lunch/dinner;
  compact families fall back to main meals when >2 are active.
- Settings: 4 meal toggles (min 1) replace the 3-option picker.
- Onboarding: meal step is now multi-select over the 4 types.
- iCloud sync: enabledMealTypesRaw synced (optional, pre-2.0 compatible).
- Localized breakfast/snack in all 6 languages.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BkanrydYtrme8wipTzWssG

MealMood/ViewModels/HomeViewModel.swift

@@ -377,7 +377,7 @@ final class HomeViewModel: ObservableObject {
     }
 
     private func mealTypeOrder(_ raw: String) -> Int {
-        raw == MealType.lunch.rawValue ? 0 : 1
+        MealType(rawValue: raw)?.order ?? 0
     }
 
     private func applyCalendarSyncPolicy(plan: WeekPlan, settings: AppSettings, shouldNotify: Bool = true) {
@@ -495,13 +495,7 @@ final class HomeViewModel: ObservableObject {
 
     private func syncSlotsIfNeeded(plan: WeekPlan, settings: AppSettings, context: ModelContext) {
         let maxDay = settings.includeWeekends ? 6 : 4
-        let mealTypes: [String] = {
-            switch settings.mealWindowsEnum {
-            case .dinnerOnly: return ["dinner"]
-            case .lunchOnly: return ["lunch"]
-            case .both: return ["lunch", "dinner"]
-            }
-        }()
+        let mealTypes: [String] = settings.activeMealTypes.map(\.rawValue)
 
         // Clean up any legacy duplicates for the same day+mealType key to keep UI mapping stable.
         var groupedByKey: [SlotKey: [MealSlot]] = [:]