piskelapp/piskel ? reverse-engineered prompt

Build me a simple web based pixel art and sprite editor like Piskel.

I want a clean app where I can draw on a canvas, make small pixel art images, and create frame by frame animations. It should feel easy to use, with basic tools like pencil, eraser, fill, color picker, undo and redo, zoom, layers or frames, and a way to play back the animation. Please also let me export my work as an image, a spritesheet, and an animated GIF.

Make it work well in the browser on desktop, and keep the interface simple and fast. If there are any current best practices or library docs you need to check, look them up online. Focus on a polished experience that looks like a real sprite editor people would actually use.