agbara286/avnac ? reverse-engineered prompt

Build me a browser based design editor for posters, social graphics, and other canvas layouts. I want a landing page, a local files page, and an editor where people can create a new canvas, open saved work, and keep everything saved in the browser. The editor should let users add text, shapes, images, lines, arrows, QR codes, and vector style boards, then move, resize, rotate, crop, group, align, and snap objects around like a real design tool.

Please make it feel fast and desktop first, with mobile editing blocked. I also want JSON import and export, image export to PNG, JPG, and WebP, plus a way to detect older files and convert them before opening. If it helps, look up current docs online for any libraries you need.