Add debug bypass subscription toggle, tests, and data layer improvements

- Add runtime toggle in Settings (DEBUG only) to bypass subscription/hide trial banner
- IAPManager.bypassSubscription is now a @Published var persisted via UserDefaults
- Hide upgrade banner in SettingsTabView and trial warnings when bypass is enabled
- Add FeelsTests directory with integration tests
- Update DataController, DataControllerGET, DataControllerUPDATE
- Update Xcode project and scheme configuration
- Update localization strings and App Store screen docs

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Shared/IAPManager.swift

@@ -36,11 +36,13 @@ class IAPManager: ObservableObject {
     // MARK: - Debug Toggle
 
     /// Set to `true` to bypass all subscription checks and grant full access (for development only)
-    /// Set to `false` to test trial/subscription behavior in DEBUG builds
+    /// Togglable at runtime in DEBUG builds via Settings > Debug > Bypass Subscription
     #if DEBUG
-    static let bypassSubscription = false
+    @Published var bypassSubscription: Bool {
+        didSet { UserDefaults.standard.set(bypassSubscription, forKey: "debug_bypassSubscription") }
+    }
     #else
-    static let bypassSubscription = false
+    let bypassSubscription = false
     #endif
 
     // MARK: - Constants
@@ -96,7 +98,7 @@ class IAPManager: ObservableObject {
     }
 
     var hasFullAccess: Bool {
-        if Self.bypassSubscription { return true }
+        if bypassSubscription { return true }
         switch state {
         case .subscribed, .billingRetry, .gracePeriod, .inTrial:
             return true
@@ -106,7 +108,7 @@ class IAPManager: ObservableObject {
     }
 
     var shouldShowPaywall: Bool {
-        if Self.bypassSubscription { return false }
+        if bypassSubscription { return false }
         switch state {
         case .trialExpired, .expired, .revoked:
             return true
@@ -116,6 +118,7 @@ class IAPManager: ObservableObject {
     }
 
     var shouldShowTrialWarning: Bool {
+        if bypassSubscription { return false }
         if case .inTrial = state { return true }
         return false
     }
@@ -137,6 +140,9 @@ class IAPManager: ObservableObject {
     // MARK: - Initialization
 
     init() {
+        #if DEBUG
+        self.bypassSubscription = UserDefaults.standard.bool(forKey: "debug_bypassSubscription")
+        #endif
         restoreCachedSubscriptionState()
         updateListenerTask = listenForTransactions()
 
@@ -219,7 +225,7 @@ class IAPManager: ObservableObject {
 
     /// Sync subscription status to UserDefaults for widget access
     private func syncSubscriptionStatusToUserDefaults() {
-        let accessValue = Self.bypassSubscription ? true : hasFullAccess
+        let accessValue = bypassSubscription ? true : hasFullAccess
         GroupUserDefaults.groupDefaults.set(accessValue, forKey: UserDefaultsStore.Keys.hasActiveSubscription.rawValue)
     }
 
@@ -373,7 +379,7 @@ class IAPManager: ObservableObject {
         case .unknown:
             status = "unknown"
             isSubscribed = false
-            hasFullAccess = Self.bypassSubscription
+            hasFullAccess = bypassSubscription
             willAutoRenew = nil
             isInGracePeriod = nil
             trialDaysRemaining = nil