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/CanonicalSyncService.swift

@@ -10,7 +10,8 @@ import Foundation
 import SwiftData
 import CloudKit
 
-actor CanonicalSyncService {
+@MainActor
+final class CanonicalSyncService {
 
     // MARK: - Errors
 
@@ -73,7 +74,6 @@ actor CanonicalSyncService {
     /// - Parameters:
     ///   - context: The ModelContext to use for saving data
     ///   - cancellationToken: Optional token to check for cancellation between entity syncs
-    @MainActor
     func syncAll(context: ModelContext, cancellationToken: SyncCancellationToken? = nil) async throws -> SyncResult {
         let startTime = Date()
         let syncState = SyncState.current(in: context)
@@ -391,7 +391,6 @@ actor CanonicalSyncService {
     }
 
     /// Re-enable sync after it was paused due to failures.
-    @MainActor
     func resumeSync(context: ModelContext) {
         let syncState = SyncState.current(in: context)
         syncState.syncEnabled = true
@@ -418,7 +417,6 @@ actor CanonicalSyncService {
 
     // MARK: - Individual Sync Methods
 
-    @MainActor
     private func syncStadiums(
         context: ModelContext,
         since lastSync: Date?,
@@ -449,7 +447,6 @@ actor CanonicalSyncService {
         return (updated, skippedIncompatible, skippedOlder)
     }
 
-    @MainActor
     private func syncTeams(
         context: ModelContext,
         since lastSync: Date?,
@@ -492,7 +489,6 @@ actor CanonicalSyncService {
         return (updated, skippedIncompatible, skippedOlder)
     }
 
-    @MainActor
     private func syncGames(
         context: ModelContext,
         since lastSync: Date?,
@@ -546,7 +542,6 @@ actor CanonicalSyncService {
         return (updated, skippedIncompatible, skippedOlder)
     }
 
-    @MainActor
     private func syncLeagueStructure(
         context: ModelContext,
         since lastSync: Date?,
@@ -571,7 +566,6 @@ actor CanonicalSyncService {
         return (updated, skippedIncompatible, skippedOlder)
     }
 
-    @MainActor
     private func syncTeamAliases(
         context: ModelContext,
         since lastSync: Date?,
@@ -596,7 +590,6 @@ actor CanonicalSyncService {
         return (updated, skippedIncompatible, skippedOlder)
     }
 
-    @MainActor
     private func syncStadiumAliases(
         context: ModelContext,
         since lastSync: Date?,
@@ -621,7 +614,6 @@ actor CanonicalSyncService {
         return (updated, skippedIncompatible, skippedOlder)
     }
 
-    @MainActor
     private func syncSports(
         context: ModelContext,
         since lastSync: Date?,
@@ -654,7 +646,6 @@ actor CanonicalSyncService {
         case skippedOlder
     }
 
-    @MainActor
     private func mergeStadium(
         _ remote: Stadium,
         canonicalId: String,
@@ -719,7 +710,6 @@ actor CanonicalSyncService {
         }
     }
 
-    @MainActor
     private func mergeTeam(
         _ remote: Team,
         canonicalId: String,
@@ -810,7 +800,6 @@ actor CanonicalSyncService {
         }
     }
 
-    @MainActor
     private func mergeGame(
         _ remote: Game,
         canonicalId: String,
@@ -925,7 +914,6 @@ actor CanonicalSyncService {
         }
     }
 
-    @MainActor
     private func mergeLeagueStructure(
         _ remote: LeagueStructureModel,
         context: ModelContext
@@ -965,7 +953,6 @@ actor CanonicalSyncService {
         }
     }
 
-    @MainActor
     private func mergeTeamAlias(
         _ remote: TeamAlias,
         context: ModelContext
@@ -1004,7 +991,6 @@ actor CanonicalSyncService {
         }
     }
 
-    @MainActor
     private func mergeStadiumAlias(
         _ remote: StadiumAlias,
         context: ModelContext
@@ -1041,7 +1027,6 @@ actor CanonicalSyncService {
         }
     }
 
-    @MainActor
     private func mergeSport(
         _ remote: CanonicalSport,
         context: ModelContext
@@ -1083,7 +1068,6 @@ actor CanonicalSyncService {
         }
     }
 
-    @MainActor
     private func ensurePlaceholderStadium(
         canonicalId: String,
         sport: Sport,