fix: comprehensive codebase hardening — crashes, silent failures, performance, and security

Fixes ~95 issues from deep audit across 12 categories in 82 files:

- Crash prevention: double-resume in PhotoMetadataExtractor, force unwraps in
  DateRangePicker, array bounds checks in polls/achievements, ProGate hit-test
  bypass, Dictionary(uniqueKeysWithValues:) → uniquingKeysWith in 4 files
- Silent failure elimination: all 34 try? sites replaced with do/try/catch +
  logging (SavedTrip, TripDetailView, CanonicalSyncService, BootstrapService,
  CanonicalModels, CKModels, SportsTimeApp, and more)
- Performance: cached DateFormatters (7 files), O(1) team lookups via
  AppDataProvider, achievement definition dictionary, AnimatedBackground
  consolidated from 19 Tasks to 1, task cancellation in SharePreviewView
- Concurrency: UIKit drawing → MainActor.run, background fetch timeout guard,
  @MainActor on ThemeManager/AppearanceManager, SyncLogger read/write race fix
- Planning engine: game end time in travel feasibility, state-aware city
  normalization, exact city matching, DrivingConstraints parameter propagation
- IAP: unknown subscription states → expired, unverified transaction logging,
  entitlements updated before paywall dismiss, restore visible to all users
- Security: API key to Info.plist lookup, filename sanitization in PDF export,
  honest User-Agent, removed stale "Feels" analytics super properties
- Navigation: consolidated competing navigationDestination, boolean → value-based
- Testing: 8 sleep() → waitForExistence, duplicates extracted, Swift 6 compat
- Service bugs: infinite retry cap, duplicate achievement prevention, TOCTOU vote
  fix, PollVote.odg → voterId rename, deterministic placeholder IDs, parallel
  MKDirections, Sendable-safe POI struct

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

SportsTime/Features/Progress/Views/VisitDetailView.swift

@@ -18,6 +18,7 @@ struct VisitDetailView: View {
 
     @State private var isEditing = false
     @State private var showDeleteConfirmation = false
+    @State private var errorMessage: String?
 
     // Edit state
     @State private var editVisitDate: Date
@@ -134,6 +135,18 @@ struct VisitDetailView: View {
         } message: {
             Text("Are you sure you want to delete this visit? This action cannot be undone.")
         }
+        .alert("Error", isPresented: Binding(
+            get: { errorMessage != nil },
+            set: { if !$0 { errorMessage = nil } }
+        )) {
+            Button("OK", role: .cancel) {
+                errorMessage = nil
+            }
+        } message: {
+            if let errorMessage {
+                Text(errorMessage)
+            }
+        }
     }
 
     // MARK: - Header
@@ -435,17 +448,25 @@ struct VisitDetailView: View {
         visit.sportEnum?.themeColor ?? Theme.warmOrange
     }
 
+    private static let longDateFormatter: DateFormatter = {
+        let f = DateFormatter()
+        f.dateStyle = .long
+        return f
+    }()
+
+    private static let mediumDateShortTimeFormatter: DateFormatter = {
+        let f = DateFormatter()
+        f.dateStyle = .medium
+        f.timeStyle = .short
+        return f
+    }()
+
     private var formattedDate: String {
-        let formatter = DateFormatter()
-        formatter.dateStyle = .long
-        return formatter.string(from: visit.visitDate)
+        Self.longDateFormatter.string(from: visit.visitDate)
     }
 
     private var formattedCreatedDate: String {
-        let formatter = DateFormatter()
-        formatter.dateStyle = .medium
-        formatter.timeStyle = .short
-        return formatter.string(from: visit.createdAt)
+        Self.mediumDateShortTimeFormatter.string(from: visit.createdAt)
     }
 
     // MARK: - Actions
@@ -472,7 +493,12 @@ struct VisitDetailView: View {
             visit.dataSource = .userCorrected
         }
 
-        try? modelContext.save()
+        do {
+            try modelContext.save()
+        } catch {
+            errorMessage = "Failed to save: \(error.localizedDescription)"
+            return
+        }
 
         withAnimation {
             isEditing = false
@@ -506,7 +532,12 @@ struct VisitDetailView: View {
 
     private func deleteVisit() {
         modelContext.delete(visit)
-        try? modelContext.save()
+        do {
+            try modelContext.save()
+        } catch {
+            errorMessage = "Failed to delete: \(error.localizedDescription)"
+            return
+        }
         dismiss()
     }
 }