refactor: Convert ticket views to use only Tailwind CSS

- Rewrite ticket show view to use pure Tailwind CSS classes
- Update color scheme from gray-* to slate-* for modern look
- Replace indigo gradients with violet for better consistency
- Enhance spacing, typography, and visual hierarchy
- Add ticket_view route and controller action for PDF-like display
- Implement responsive QR code display with proper sizing
- Update status badge colors for better semantic meaning
- Improve accessibility with better button layouts and focus states

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

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

app/controllers/tickets_controller.rb

@@ -3,7 +3,7 @@
 # This controller now primarily handles legacy redirects and backward compatibility
 # Most ticket creation functionality has been moved to OrdersController
 class TicketsController < ApplicationController
-  before_action :authenticate_user!, only: [ :payment_success, :payment_cancel, :show, :download_ticket ]
+  before_action :authenticate_user!, only: [ :payment_success, :payment_cancel, :show, :ticket_view, :download_ticket ]
   before_action :set_event, only: [ :checkout, :retry_payment ]
 
 
@@ -59,6 +59,23 @@ class TicketsController < ApplicationController
     redirect_to dashboard_path, alert: "Billet non trouvé"
   end
 
+  # Display ticket in PDF-like format
+  def ticket_view
+    @ticket = Ticket.joins(order: :user).includes(:event, :ticket_type, order: :user).find_by(
+      tickets: { id: params[:ticket_id] },
+      orders: { user_id: current_user.id }
+    )
+
+    if @ticket.nil?
+      redirect_to dashboard_path, alert: "Billet non trouvé ou vous n'avez pas l'autorisation d'accéder à ce billet"
+      return
+    end
+
+    @event = @ticket.event
+  rescue ActiveRecord::RecordNotFound
+    redirect_to dashboard_path, alert: "Billet non trouvé"
+  end
+
   # Download PDF ticket - only accessible by ticket owner
   # User must be authenticated to download ticket
   # TODO: change ID to an unique identifier (UUID)