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/Views/Home/HomeView.swift

@@ -211,6 +211,11 @@ struct HomeView: View {
                   let plan = ensureCurrentWeekPlanExists(settings: settings) else { return }
             viewModel.reconcileSlotsIfNeeded(plan: plan, settings: settings, context: context)
         }
+        .onChange(of: settings?.enabledMealTypesRaw) { _, _ in
+            guard let settings = settings,
+                  let plan = ensureCurrentWeekPlanExists(settings: settings) else { return }
+            viewModel.reconcileSlotsIfNeeded(plan: plan, settings: settings, context: context)
+        }
         .onChange(of: settings?.mealWindows) { _, _ in
             guard let settings = settings,
                   let plan = ensureCurrentWeekPlanExists(settings: settings) else { return }