Add image cards to radio and checklist options

Radio and checklist components now render as selectable image-card grids when their options include images, replacing the separate image choice and image checklist component types.

• Added an image field on radio and checklist options that switches rendering to an image-card grid in the operator UI, with columns, aspect, and fit layout controls
• Removed the image_choice and image_checklist component types; procedures should use radio and checklist with image options instead
• Merged the image choice and image checklist documentation into the radio and checklist pages, with redirects from the old URLs