✨ Add printable materials feature for events

Introduce a new feature allowing users to download printable PDFs with QR codes for events. Includes templates for table tents, posters, flyers, and signs to enhance guest interaction. :art: Improve code formatting in tests Refactor spacing in test assertions for better readability and consistency. :white_check_mark: Add tests for event zip generation and email Implement tests for downloading event zips and sending email notifications. :arrow_up: Upgrade rqrcode and rubyzip dependencies Update rqrcode to version 3.1.1 and rubyzip to version 3.2.2 for enhanced functionality and security improvements.