Refactor StoreKit 2 subscription system and add interactive vote widget

## StoreKit 2 Refactor
- Rewrote IAPManager with clean enum-based state model (SubscriptionState)
- Added native SubscriptionStoreView for iOS 17+ purchase UI
- Subscription status now checked on every app launch
- Synced subscription status to UserDefaults for widget access
- Simplified PurchaseButtonView and IAPWarningView
- Removed unused StatusInfoView

## Interactive Vote Widget
- New FeelsVoteWidget with App Intents for mood voting
- Subscribers can vote directly from widget, shows stats after voting
- Non-subscribers see "Tap to subscribe" which opens subscription store
- Added feels:// URL scheme for deep linking

## Firebase Removal
- Commented out Firebase imports and initialization
- EventLogger now prints to console in DEBUG mode only

## Other Changes
- Added fallback for Core Data when App Group unavailable
- Added new localization strings for subscription UI
- Updated entitlements and Info.plist

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

es.lproj/Localizable.strings

@@ -120,8 +120,19 @@
 "purchase_view_loading" = "Loading subscription options";
 "purchase_view_restore" = "Restore";
 
-"iap_warning_view_title" = "This view will no longer scroll in ";
-"iap_warning_view_buy_button" = "Subscribe Now";
+"iap_warning_view_title" = "La prueba expira en ";
+"iap_warning_view_buy_button" = "Suscribirse Ahora";
+
+"subscription_store_title" = "Desbloquear Acceso Completo";
+"subscription_store_subtitle" = "Obtén acceso ilimitado a las vistas de Mes y Año, además de todos tus datos de estado de ánimo históricos.";
+"subscription_required_button" = "Suscribirse para Desbloquear";
+"subscription_status_active" = "Activa";
+"subscription_status_expires" = "Expira Pronto";
+"purchase_view_trial_expired" = "Tu prueba gratuita ha terminado.";
+"purchase_view_subscribe_button" = "Suscribirse Ahora";
+"purchase_view_trial_expires_in" = "La prueba expira en";
+"purchase_view_manage_subscription" = "Administrar Suscripción";
+"purchase_view_change_plan" = "Cambiar Plan";