Improves donation UI and adds QRIS download button

Add donation modal with payment platforms and cryptocurrency support

Enhance layout responsiveness for QR code display; adjust form section flex properties and improve mobile scrolling behavior for QR code visibility.

Refactor layout for main content and result section; implement flexbox for improved animation and responsiveness in QR code display.

Update layout styles for responsive design; enhance QR code display functionality with animation and visibility control.

Refactor layout and styles for a modernized QR Code Generator UI; enhance animations, update header and footer design, and improve file upload handling in JavaScript.

Add base styles, components, layout, and main application script for QR Code Generator