feat: Implement complete event ticketing system with Stripe integration and email confirmations

- Enhanced events index page with improved visual design and better information display
- Completely redesigned event show page with modern layout, ticket selection, and checkout functionality
- Implemented Stripe payment processing for ticket purchases
- Created ticket generation system with PDF tickets and QR codes
- Added email confirmation system with ticket attachments
- Updated database configuration to use SQLite for easier development setup
- Fixed gem dependencies and resolved conflicts
- Improved error handling throughout the checkout process
- Enhanced Stimulus controller for ticket cart management
- Added proper redirect handling for successful and cancelled payments

app/mailers/ticket_mailer.rb

@@ -0,0 +1,21 @@
+class TicketMailer < ApplicationMailer
+  default from: 'notifications@aperonight.com'
+
+  def purchase_confirmation(ticket)
+    @ticket = ticket
+    @user = ticket.user
+    @event = ticket.event
+    
+    # Generate PDF attachment
+    pdf = @ticket.to_pdf
+    attachments["ticket-#{@event.name.parameterize}-#{@ticket.qr_code[0..7]}.pdf"] = {
+      mime_type: 'application/pdf',
+      content: pdf
+    }
+    
+    mail(
+      to: @user.email,
+      subject: "Confirmation d'achat - #{@event.name}"
+    )
+  end
+end