fix: codebase audit fixes — safety, accessibility, and production hygiene

Address 16 issues from external audit:
- Move StoreKit transaction listener ownership to StoreManager singleton with proper deinit
- Remove noisy VoiceOver announcements, add missing accessibility on StatPill and BootstrapLoadingView
- Replace String @retroactive Identifiable with IdentifiableShareCode wrapper
- Add crash guard in AchievementEngine getContributingVisitIds + cache stadium lookups
- Pre-compute GamesHistoryViewModel filtered properties to avoid redundant SwiftUI recomputation
- Remove force-unwraps in ProgressMapView with safe guard-let fallback
- Add diff-based update gating in ItineraryTableViewWrapper to prevent unnecessary reloads
- Replace deprecated UIScreen.main with UIWindowScene lookup
- Add deinit task cancellation in ScheduleViewModel and SuggestedTripsGenerator
- Wrap ~234 unguarded print() calls across 27 files in #if DEBUG

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

SportsTime/Features/Trip/Views/ItineraryTableViewWrapper.swift

@@ -53,6 +53,10 @@ struct ItineraryTableViewWrapper<HeaderContent: View>: UIViewControllerRepresent
     
     class Coordinator {
         var headerHostingController: UIHostingController<HeaderContent>?
+        var lastStopCount: Int = 0
+        var lastGameIDsHash: Int = 0
+        var lastItemCount: Int = 0
+        var lastOverrideCount: Int = 0
     }
     
     func makeUIViewController(context: Context) -> ItineraryTableViewController {
@@ -73,7 +77,9 @@ struct ItineraryTableViewWrapper<HeaderContent: View>: UIViewControllerRepresent
         
         // Pre-size the header view
         hostingController.view.translatesAutoresizingMaskIntoConstraints = false
-        let targetWidth = UIScreen.main.bounds.width
+        let targetWidth = UIApplication.shared.connectedScenes
+            .compactMap { ($0 as? UIWindowScene)?.screen.bounds.width }
+            .first ?? 390
         let targetSize = CGSize(width: targetWidth, height: UIView.layoutFittingCompressedSize.height)
         let size = hostingController.view.systemLayoutSizeFitting(targetSize, withHorizontalFittingPriority: .required, verticalFittingPriority: .fittingSizeLevel)
         hostingController.view.frame = CGRect(origin: .zero, size: CGSize(width: targetWidth, height: max(size.height, 450)))
@@ -109,6 +115,25 @@ struct ItineraryTableViewWrapper<HeaderContent: View>: UIViewControllerRepresent
         // This avoids recreating the view hierarchy and prevents infinite loops
         context.coordinator.headerHostingController?.rootView = headerContent
 
+        // Diff inputs before rebuilding to avoid unnecessary reloads
+        let currentStopCount = trip.stops.count
+        let currentGameIDsHash = games.map(\.game.id).hashValue
+        let currentItemCount = itineraryItems.count
+        let currentOverrideCount = travelOverrides.count
+
+        let coord = context.coordinator
+        guard currentStopCount != coord.lastStopCount ||
+              currentGameIDsHash != coord.lastGameIDsHash ||
+              currentItemCount != coord.lastItemCount ||
+              currentOverrideCount != coord.lastOverrideCount else {
+            return
+        }
+
+        coord.lastStopCount = currentStopCount
+        coord.lastGameIDsHash = currentGameIDsHash
+        coord.lastItemCount = currentItemCount
+        coord.lastOverrideCount = currentOverrideCount
+
         let (days, validRanges, allItemsForConstraints, travelSegmentIndices) = buildItineraryData()
         controller.reloadData(
             days: days,