Major refactor to use operation stack instead of destructive edits: - All edits are now non-destructive (crop, bg color, bg removal) - Operations stack: removeBg, crop, bgColor - Undo button to remove last operation - Optimize preserves transparency (uses PNG for transparent images) - Background color is preview-only until export - Crop can be adjusted without quality loss - Original image preserved for re-processing Fixes: - Optimize no longer converts transparency to black background - Background color changes don't bake into image permanently - Can undo any operation 💘 Generated with Crush Assisted-by: Claude Sonnet 4.5 via Crush <crush@charm.land>