style: correct coding style with rubocop linter

app/services/ticket_pdf_generator.rb

@@ -1,6 +1,6 @@
-require 'prawn'
-require 'prawn/qrcode'
-require 'rqrcode'
+require "prawn"
+require "prawn/qrcode"
+require "rqrcode"
 
 class TicketPdfGenerator
   attr_reader :ticket
@@ -10,7 +10,7 @@ class TicketPdfGenerator
   end
 
   def generate
-    Prawn::Document.new(page_size: [350, 600], margin: 20) do |pdf|
+    Prawn::Document.new(page_size: [ 350, 600 ], margin: 20) do |pdf|
       # Header
       pdf.fill_color "2D1B69"
       pdf.font "Helvetica", style: :bold, size: 24
@@ -26,7 +26,7 @@ class TicketPdfGenerator
       # Ticket info box
       pdf.stroke_color "E5E7EB"
       pdf.fill_color "F9FAFB"
-      pdf.rounded_rectangle [0, pdf.cursor], 310, 120, 10
+      pdf.rounded_rectangle [ 0, pdf.cursor ], 310, 120, 10
       pdf.fill_and_stroke
 
       pdf.move_down 10
@@ -82,7 +82,7 @@ class TicketPdfGenerator
 
       qrcode = RQRCode::QRCode.new(qr_code_data)
       pdf.print_qr_code(qrcode, extent: 120, align: :center)
-      
+
       pdf.move_down 15
 
       # QR code text
@@ -104,4 +104,4 @@ class TicketPdfGenerator
       pdf.text "Generated on #{Time.current.strftime('%B %d, %Y at %I:%M %p')}", align: :center
     end.render
   end
-end
+end