Improve clipboard copy fallback for image and SVG

Support button

Fix error on tab changing

perf: optimize magnifier performance for smooth operation

Remove redundant magnifier toggle call

Add user presets for settings and magnifier state persistence

Improve palette handling and clipboard fallbacks

Update README with screenshots and article links

Improve pixel art downscaling and add auto color count

Add Python port link to integrations section

Add upscaled PNG download and improve magnifier cache

Add integrations and online demo links to README

Update README.md

Refactor pixel art grid detection and UI settings

First version