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/Progress/Views/AchievementsListView.swift

@@ -366,6 +366,7 @@ struct AchievementCard: View {
                 VStack(spacing: 4) {
                     ProgressView(value: achievement.progressPercentage)
                         .progressViewStyle(AchievementProgressStyle(category: achievement.definition.category))
+                        .accessibilityValue("\(Int(achievement.progressPercentage * 100)) percent, \(achievement.progressText)")
 
                     Text(achievement.progressText)
                         .font(.caption)
@@ -575,6 +576,7 @@ struct AchievementDetailSheet: View {
                         ProgressView(value: achievement.progressPercentage)
                             .progressViewStyle(LargeProgressStyle())
                             .frame(width: 200)
+                            .accessibilityValue("\(Int(achievement.progressPercentage * 100)) percent, \(achievement.currentProgress) of \(achievement.totalRequired)")
 
                         Text("\(achievement.currentProgress) / \(achievement.totalRequired)")
                             .font(.headline)

SportsTime/Features/Progress/Views/ProgressMapView.swift

@@ -62,6 +62,7 @@ struct ProgressMapView: View {
                         .padding(12)
                         .background(.regularMaterial, in: Circle())
                 }
+                .accessibilityLabel("Reset map view")
                 .padding()
             }
         }