2048 Chrome Extension

Classic 2048 reimplemented as Chrome extension (979 lines, zero dependencies). 4 difficulty levels with adjustable spawn probabilities (2 vs 4), undo system up to 10 previous moves, persistent statistics (games played, best score, highest tile). Light/dark themes with persistent preferences, modern pill-shaped selectors, score animations, victory confetti, custom modals. Complete ARIA labels, WCAG contrast. Manifest V3.