feat: Implement complete ticket purchasing flow with new TicketsController

- Create new TicketsController with actions for name collection, creation, and checkout
- Add dedicated ticket views (new.html.erb, checkout.html.erb, show.html.erb)
- Update ticket_selection_controller.js to handle form submission via AJAX
- Add store_cart endpoint in EventsController for session-based cart management
- Update routes to support new ticket flow: /tickets/new, /create, /checkout
- Fix attribute name consistency across views (title→name, starts_at→start_time)
- Add Stripe checkout integration with proper error handling
- Remove deprecated collect_names flow in favor of streamlined approach

The flow is now: Event selection → AJAX cart storage → Name collection → Checkout → Payment

bin/test_stripe_initialization.rb

@@ -0,0 +1,25 @@
+#!/usr/bin/env ruby
+
+# Test Stripe initialization
+puts "Testing Stripe initialization..."
+puts "Rails.application.config.stripe: #{Rails.application.config.stripe}"
+puts "Secret key present?: #{Rails.application.config.stripe[:secret_key].present?}"
+
+# Try to initialize Stripe directly
+begin
+  Stripe.api_key = Rails.application.config.stripe[:secret_key]
+  puts "Stripe successfully initialized with API key"
+rescue => e
+  puts "Error initializing Stripe: #{e.message}"
+end
+
+# Test creating a simple Stripe object
+begin
+  # This won't actually create a customer, just test if the API key works
+  Stripe::Customer.list(limit: 1)
+  puts "Stripe API connection successful"
+rescue Stripe::AuthenticationError => e
+  puts "Stripe Authentication Error: #{e.message}"
+rescue => e
+  puts "Other Stripe Error: #{e.message}"
+end