* fix(tabs): prevent markdown blockquote parsing when nested in steps
Consolidate HTML attributes onto single lines and add proper whitespace
trimming to prevent `>` characters on separate lines from being
interpreted as markdown blockquotes when tabs are nested inside the
steps shortcode.
Fixes#876
* chore: add comment explaining single-line HTML requirement
Add support for custom alt text on card images to improve accessibility.
The alt parameter is optional and defaults to the card title if not provided,
maintaining backward compatibility with existing implementations.
Fixes#896
