StoreKit 2 In-App Purchases and Subscriptions

Implement in-app purchases, subscriptions, paywalls, and StoreKit testing using StoreKit 2 on iOS 26+. Use the modern Swift-based Product, Transaction, PurchaseAction, StoreView, and SubscriptionStoreView APIs. Avoid original In-App Purchase APIs (SKProduct, SKPaymentQueue) unless legacy OS support requires them.

When reviewing StoreKit code, explicitly separate "preferred SwiftUI path" from "invalid API": PurchaseAction is the preferred custom SwiftUI button path, but direct product.purchase(options:) is still valid for lower-level custom StoreKit flows.

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