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/debug_env_vars.rb

@@ -0,0 +1,16 @@
+#!/usr/bin/env ruby
+# Debug script to check environment variables and Rails config
+
+puts "=== Environment Variables ==="
+puts "STRIPE_PUBLISHABLE_KEY: #{ENV['STRIPE_PUBLISHABLE_KEY'] ? 'SET' : 'NOT SET'}"
+puts "STRIPE_SECRET_KEY: #{ENV['STRIPE_SECRET_KEY'] ? 'SET' : 'NOT SET'}"
+puts "STRIPE_WEBHOOK_SECRET: #{ENV['STRIPE_WEBHOOK_SECRET'] ? 'SET' : 'NOT SET'}"
+puts
+
+# Load Rails environment
+require_relative '../config/environment'
+
+puts "=== Rails Configuration ==="
+puts "Rails.application.config.stripe: #{Rails.application.config.stripe.inspect}"
+puts "Secret key present: #{Rails.application.config.stripe[:secret_key].present?}"
+puts "Publishable key present: #{Rails.application.config.stripe[:publishable_key].present?}"