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

db/seeds.rb

@@ -9,20 +9,20 @@
 #   end
 
 # Create admin user for development
-admin_user = User.find_or_create_by!(email: 'admin@example.com') do |u|
-  u.password = 'password'
-  u.password_confirmation = 'password'
+admin_user = User.find_or_create_by!(email: "admin@example.com") do |u|
+  u.password = "password"
+  u.password_confirmation = "password"
   u.last_name = nil
   u.first_name = nil
 end
 
 # Create regular users for development
-users = User.where.not(email: 'admin@example.com').limit(5)
+users = User.where.not(email: "admin@example.com").limit(5)
 missing_users_count = 5 - users.count
 missing_users_count.times do |i|
   User.find_or_create_by!(email: "user#{i + 1}@example.com") do |u|
-    u.password = 'password'
-    u.password_confirmation = 'password'
+    u.password = "password"
+    u.password_confirmation = "password"
     u.last_name = nil
     u.first_name = nil
   end
@@ -97,7 +97,6 @@ events.each_with_index do |event, index|
     tt.quantity = 100
     tt.sale_start_at = 1.month.ago
     tt.sale_end_at = event.start_time - 1.hour
-    tt.requires_id = false
     tt.minimum_age = 18
   end
 
@@ -108,7 +107,6 @@ events.each_with_index do |event, index|
     tt.quantity = 20
     tt.sale_start_at = 1.month.ago
     tt.sale_end_at = event.start_time - 1.hour
-    tt.requires_id = true
     tt.minimum_age = 21
   end
 end