fix: 10 audit fixes — memory safety, performance, accessibility, architecture

- Add a11y label to ProgressMapView reset button and progress bar values
- Fix CADisplayLink retain cycle in ItineraryTableViewController via deinit
- Add [weak self] to PhotoGalleryViewModel Task closure
- Add @MainActor to TripWizardViewModel, remove manual MainActor.run hop
- Fix O(n²) rank lookup in PollDetailView/DebugPollPreviewView with enumerated()
- Cache itinerarySections via ItinerarySectionBuilder static extraction + @State
- Convert CanonicalSyncService/BootstrapService from actor to @MainActor final class
- Add .accessibilityHidden(true) to RegionMapSelector Map to prevent duplicate VoiceOver

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

SportsTime/Features/Trip/Views/RegionMapSelector.swift

@@ -54,6 +54,7 @@ struct RegionMapSelector: View {
                             .stroke(strokeColor(for: .east), lineWidth: strokeWidth(for: .east))
                     }
                     .mapStyle(.standard(elevation: .flat, pointsOfInterest: .excludingAll))
+                    .accessibilityHidden(true)
                     .onTapGesture { location in
                         if let coordinate = proxy.convert(location, from: .local) {
                             let tappedRegion = Self.regionForCoordinate(coordinate)