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)

app/controllers/pages_controller.rb

@@ -29,6 +29,11 @@ class PagesController < ApplicationController
       .distinct
       .limit(5)
 
+    # Draft tickets that can be retried
+    @draft_tickets = current_user.tickets.includes(:ticket_type, :event)
+                                       .can_retry_payment
+                                       .order(:expires_at)
+
     # Events sections
     @today_events = Event.published.where("DATE(start_time) = ?", Date.current).order(start_time: :asc)
     @tomorrow_events = Event.published.where("DATE(start_time) = ?", Date.current + 1).order(start_time: :asc)