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/ViewModels/TripWizardViewModel.swift

@@ -8,7 +8,7 @@
 import Foundation
 import SwiftUI
 
-@Observable
+@MainActor @Observable
 final class TripWizardViewModel {
 
     // MARK: - Planning Mode
@@ -186,9 +186,7 @@ final class TripWizardViewModel {
             }
         }
 
-        await MainActor.run {
-            self.sportAvailability = availability
-        }
+        self.sportAvailability = availability
     }
 
     // MARK: - Reset Logic