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/views/YearView/YearView.swift

@@ -25,7 +25,8 @@ struct YearView: View {
     @EnvironmentObject var iapManager: IAPManager
     @StateObject public var viewModel: YearViewModel
     @StateObject private var filteredDays = DaysFilterClass.shared
-    @State private var iAPWarningViewHidden = false
+    @State private var trialWarningHidden = false
+    @State private var showSubscriptionStore = false
     //[
     //  2001: [0: [], 1: [], 2: []],
     //  2002: [0: [], 1: [], 2: []]
@@ -60,24 +61,44 @@ struct YearView: View {
                             }
                         )
                 }
-                .disabled(iapManager.showIAP)
+                .disabled(iapManager.shouldShowPaywall)
                 .padding(.bottom, 5)
             }
-            
-            if iapManager.showIAP {
+
+            if iapManager.shouldShowPaywall {
+                // Paywall overlay - tap to show subscription store
+                Color.black.opacity(0.3)
+                    .ignoresSafeArea()
+                    .onTapGesture {
+                        showSubscriptionStore = true
+                    }
+
                 VStack {
                     Spacer()
-                    PurchaseButtonView(height: 250, iapManager: iapManager)
+                    Button {
+                        showSubscriptionStore = true
+                    } label: {
+                        Text(String(localized: "subscription_required_button"))
+                            .font(.headline)
+                            .foregroundColor(.white)
+                            .frame(maxWidth: .infinity)
+                            .padding()
+                            .background(RoundedRectangle(cornerRadius: 10).fill(Color.pink))
+                    }
+                    .padding()
                 }
-            } else if iapManager.showIAPWarning {
+            } else if iapManager.shouldShowTrialWarning {
                 VStack {
                     Spacer()
-                    if !iAPWarningViewHidden {
-                        IAPWarningView(height: 75, iapManager: iapManager)
+                    if !trialWarningHidden {
+                        IAPWarningView(iapManager: iapManager)
                     }
                 }
             }
         }
+        .sheet(isPresented: $showSubscriptionStore) {
+            FeelsSubscriptionStoreView()
+        }
         .onAppear(perform: {
             self.viewModel.filterEntries(startDate: Date(timeIntervalSince1970: 0), endDate: Date())
         })
@@ -87,7 +108,7 @@ struct YearView: View {
         )
         .onPreferenceChange(ViewOffsetKey.self) { value in
             withAnimation {
-                iAPWarningViewHidden = value < 0
+                trialWarningHidden = value < 0
             }
         }
         .padding([.top])