feat: Enhance user dashboard and order management

- Add orders index action to OrdersController with pagination support
- Simplify dashboard to focus on user orders and actions
- Redesign order show page with improved layout and ticket access
- Remove complex event metrics in favor of streamlined order management
- Add direct links to ticket downloads and better order navigation
- Improve responsive design and user experience across order views

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

config/routes.rb

@@ -42,7 +42,7 @@ Rails.application.routes.draw do
   get "orders/new/events/:slug.:id", to: "orders#new", as: "event_order_new"
   post "orders/create/events/:slug.:id", to: "orders#create", as: "event_order_create"
 
-  resources :orders, only: [ :show ] do
+  resources :orders, only: [ :index, :show ] do
     member do
       get :checkout
       post :retry_payment