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/Core/Services/VisitPhotoService.swift

@@ -372,20 +372,20 @@ final class PhotoGalleryViewModel {
         }
 
         isLoadingFullImage = true
-        Task {
+        Task { [weak self] in
             do {
-                let image = try await photoService.fetchFullImage(for: metadata)
-                fullResolutionImage = image
+                let image = try await self?.photoService.fetchFullImage(for: metadata)
+                self?.fullResolutionImage = image
             } catch let error as PhotoServiceError {
-                self.error = error
+                self?.error = error
                 // Fall back to thumbnail
                 if let data = metadata.thumbnailData {
-                    fullResolutionImage = UIImage(data: data)
+                    self?.fullResolutionImage = UIImage(data: data)
                 }
             } catch {
-                self.error = .downloadFailed(error.localizedDescription)
+                self?.error = .downloadFailed(error.localizedDescription)
             }
-            isLoadingFullImage = false
+            self?.isLoadingFullImage = false
         }
     }