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/IAPWarningView.swift

@@ -1,69 +1,57 @@
 //
-//  PurchaseButtonView.swift
+//  IAPWarningView.swift
 //  Feels
 //
-//  Created by Trey Tartt on 7/7/22.
+//  Trial warning banner shown at bottom of Month/Year views.
 //
 
 import SwiftUI
-import StoreKit
 
 struct IAPWarningView: View {
     @AppStorage(UserDefaultsStore.Keys.theme.rawValue, store: GroupUserDefaults.groupDefaults) private var theme: Theme = .system
     @AppStorage(UserDefaultsStore.Keys.textColor.rawValue, store: GroupUserDefaults.groupDefaults) private var textColor: Color = DefaultTextColor.textColor
-    @AppStorage(UserDefaultsStore.Keys.firstLaunchDate.rawValue, store: GroupUserDefaults.groupDefaults) private var firstLaunchDate = Date()
-    
-    var iapManager: IAPManager
-    
-    private let height: Float
-    private let showManageSubClosure: (() -> Void)?
-    
-    @State private var showSettings = false
-    
-    public init(height: Float, iapManager: IAPManager, showManageSubClosure: (() -> Void)? = nil, showCountdownTimer: Bool = false) {
-        self.height = height
-        self.showManageSubClosure = showManageSubClosure
-        self.iapManager = iapManager
-    }
-    
+
+    @ObservedObject var iapManager: IAPManager
+
+    @State private var showSubscriptionStore = false
+
     var body: some View {
-        VStack {
-            if let date = Calendar.current.date(byAdding: .day, value: 30, to: firstLaunchDate) {
+        VStack(spacing: 8) {
+            HStack {
+                Image(systemName: "clock")
+                    .foregroundColor(.orange)
+
                 Text(String(localized: "iap_warning_view_title"))
                     .font(.body)
-                    .frame(minWidth: 0, maxWidth: .infinity)
-                    .background(theme.currentTheme.secondaryBGColor)
-                
-                Text(date, style: .relative)
-                    .font(.body)
-                    .bold()
                     .foregroundColor(textColor)
-                
-                Button(action: {
-                    showSettings.toggle()
-                }, label: {
-                    Text(String(localized: "iap_warning_view_buy_button"))
-                        .foregroundColor(.white)
+
+                if let expirationDate = iapManager.trialExpirationDate {
+                    Text(expirationDate, style: .relative)
+                        .font(.body)
                         .bold()
-                        .frame(maxWidth: .infinity)
-                        .contentShape(Rectangle())
-                })
-                .frame(maxWidth: .infinity)
-                .frame(height: 50)
-                .background(RoundedRectangle(cornerRadius: 10).fill(DefaultMoodTint.color(forMood: .great)))
+                        .foregroundColor(.orange)
+                }
+            }
+
+            Button {
+                showSubscriptionStore = true
+            } label: {
+                Text(String(localized: "iap_warning_view_buy_button"))
+                    .font(.headline)
+                    .foregroundColor(.white)
+                    .frame(maxWidth: .infinity)
+                    .padding(.vertical, 12)
+                    .background(RoundedRectangle(cornerRadius: 10).fill(Color.pink))
             }
         }
-        .frame(minWidth: 0, maxWidth: .infinity)
         .padding()
         .background(theme.currentTheme.secondaryBGColor)
-        .sheet(isPresented: $showSettings) {
-            SettingsView()
+        .sheet(isPresented: $showSubscriptionStore) {
+            FeelsSubscriptionStoreView()
         }
     }
 }
 
-struct IAPWarningView_Previews: PreviewProvider {
-    static var previews: some View {
-        IAPWarningView(height: 175, iapManager: IAPManager())
-    }
+#Preview {
+    IAPWarningView(iapManager: IAPManager())
 }