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/migrate/20250823170408_create_ticket_types.rb

@@ -7,7 +7,6 @@ class CreateTicketTypes < ActiveRecord::Migration[8.0]
       t.integer :quantity
       t.datetime :sale_start_at
       t.datetime :sale_end_at
-      t.boolean :requires_id
       t.integer :minimum_age
       t.references :event, null: false, foreign_key: false
 

db/migrate/20250823171354_create_tickets.rb

@@ -3,7 +3,7 @@ class CreateTickets < ActiveRecord::Migration[8.0]
     create_table :tickets do |t|
       t.string :qr_code
       t.integer :price_cents
-      t.string :status, default: "active"
+      t.string :status, default: "draft"
 
       # Add names to ticket
       t.string :first_name