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/services/ticket_pdf_generator.rb

@@ -0,0 +1,97 @@
+require 'prawn'
+require 'prawn/qrcode'
+require 'rqrcode'
+
+class TicketPdfGenerator
+  attr_reader :ticket
+
+  def initialize(ticket)
+    @ticket = ticket
+  end
+
+  def generate
+    Prawn::Document.new(page_size: [350, 600], margin: 20) do |pdf|
+      # Header
+      pdf.fill_color "2D1B69"
+      pdf.font "Helvetica", style: :bold, size: 24
+      pdf.text "ApéroNight", align: :center
+      pdf.move_down 10
+
+      # Event name
+      pdf.fill_color "000000"
+      pdf.font "Helvetica", style: :bold, size: 18
+      pdf.text ticket.event.name, align: :center
+      pdf.move_down 20
+
+      # Ticket info box
+      pdf.stroke_color "E5E7EB"
+      pdf.fill_color "F9FAFB"
+      pdf.rounded_rectangle [0, pdf.cursor], 310, 120, 10
+      pdf.fill_and_stroke
+
+      pdf.move_down 10
+      pdf.fill_color "000000"
+      pdf.font "Helvetica", size: 12
+
+      # Ticket details
+      pdf.text "Ticket Type:", style: :bold
+      pdf.text ticket.ticket_type.name
+      pdf.move_down 8
+
+      pdf.text "Price:", style: :bold
+      pdf.text "€#{ticket.price_euros}"
+      pdf.move_down 8
+
+      pdf.text "Date & Time:", style: :bold
+      pdf.text ticket.event.start_time.strftime("%B %d, %Y at %I:%M %p")
+      pdf.move_down 20
+
+      # Venue information
+      pdf.fill_color "374151"
+      pdf.font "Helvetica", style: :bold, size: 14
+      pdf.text "Venue Information"
+      pdf.move_down 8
+
+      pdf.font "Helvetica", size: 11
+      pdf.text ticket.event.venue_name, style: :bold
+      pdf.text ticket.event.venue_address
+      pdf.move_down 20
+
+      # QR Code
+      pdf.fill_color "000000"
+      pdf.font "Helvetica", style: :bold, size: 14
+      pdf.text "Ticket QR Code", align: :center
+      pdf.move_down 10
+
+      qr_code_data = {
+        ticket_id: ticket.id,
+        qr_code: ticket.qr_code,
+        event_id: ticket.event.id,
+        user_id: ticket.user.id
+      }.to_json
+
+      qrcode = RQRCode::QRCode.new(qr_code_data)
+      pdf.print_qr_code(qrcode, extent: 120, align: :center)
+      
+      pdf.move_down 15
+
+      # QR code text
+      pdf.font "Helvetica", size: 8
+      pdf.fill_color "6B7280"
+      pdf.text "QR Code: #{ticket.qr_code[0..7]}...", align: :center
+
+      # Footer
+      pdf.move_down 30
+      pdf.stroke_color "E5E7EB"
+      pdf.horizontal_line 0, 310
+      pdf.move_down 10
+
+      pdf.font "Helvetica", size: 8
+      pdf.fill_color "6B7280"
+      pdf.text "This ticket is valid for one entry only.", align: :center
+      pdf.text "Present this ticket at the venue entrance.", align: :center
+      pdf.move_down 5
+      pdf.text "Generated on #{Time.current.strftime('%B %d, %Y at %I:%M %p')}", align: :center
+    end.render
+  end
+end