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>

Shared/Models/MoodEntryExtension.swift

@@ -12,6 +12,7 @@ enum EntryType: Int {
     case header
     case listView
     case filledInMissing
+    case widget
 }
 
 extension MoodEntry {

Shared/Models/UserDefaultsStore.swift

@@ -26,7 +26,9 @@ class UserDefaultsStore {
         case shape
         case daysFilter
         case firstLaunchDate
-        
+        case hasActiveSubscription
+        case lastVotedDate
+
         case contentViewCurrentSelectedHeaderViewBackDays
         case contentViewHeaderTag
         case contentViewHeaderTagViewOneViewType