feat: Complete email notifications system with comprehensive functionality

- Implement comprehensive email notification system for ticket purchases and event reminders
- Add event reminder job with configurable scheduling
- Enhance ticket mailer with QR code generation and proper formatting
- Update order model with email delivery tracking
- Add comprehensive test coverage for all email functionality
- Configure proper mailer settings and disable annotations
- Update backlog to reflect completed email features

🤖 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 ]
+  before_action :authenticate_user!, only: [ :payment_success, :payment_cancel, :show ]
   before_action :set_event, only: [ :checkout, :retry_payment ]
 
 
@@ -49,7 +49,16 @@ class TicketsController < ApplicationController
   end
 
   def show
-    @ticket = current_user.orders.joins(:tickets).find(params[:ticket_id])
+    @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"
+      return
+    end
+
     @event = @ticket.event
   rescue ActiveRecord::RecordNotFound
     redirect_to dashboard_path, alert: "Billet non trouvé"