feat: Implement payment retry system and draft ticket expiry management

- Add 30-minute expiry window for draft tickets with automatic cleanup
- Implement 3-attempt payment retry mechanism with tracking
- Create background job for cleaning expired draft tickets every 10 minutes
- Add comprehensive UI warnings for expiring tickets and retry attempts
- Enhance dashboard to display pending draft tickets with retry options
- Add payment cancellation handling with smart retry redirections
- Include rake tasks for manual cleanup and statistics
- Add database fields: expires_at, payment_attempts, last_payment_attempt_at, stripe_session_id
- Fix payment attempt counter display to show correct attempt number (1/3, 2/3, 3/3)

lib/tasks/tickets.rake

@@ -0,0 +1,22 @@
+namespace :tickets do
+  desc "Clean up expired draft tickets"
+  task cleanup_expired_drafts: :environment do
+    puts "Starting cleanup of expired draft tickets..."
+    CleanupExpiredDraftsJob.perform_now
+    puts "Cleanup completed."
+  end
+
+  desc "Show stats about draft tickets"
+  task stats: :environment do
+    total_drafts = Ticket.draft.count
+    expired_drafts = Ticket.expired_drafts.count
+    retryable_drafts = Ticket.can_retry_payment.count
+    
+    puts "=== Draft Ticket Statistics ==="
+    puts "Total draft tickets: #{total_drafts}"
+    puts "Expired draft tickets: #{expired_drafts}"
+    puts "Retryable draft tickets: #{retryable_drafts}"
+    puts "Max payment attempts: #{Ticket::MAX_PAYMENT_ATTEMPTS}"
+    puts "Draft expiry time: #{Ticket::DRAFT_EXPIRY_TIME}"
+  end
+end