Drag & drop: always offer a keyboard alternative (note)

• Drag-only UIs exclude keyboard and screen reader users — they may not be able to reorder, move, or manipulate items at all.
• Always offer keyboard-accessible alternatives: add Move up/down buttons, context menu options, or simple text input.
• Announce changes with aria-live so users know what moved or changed.
• Preserve focus on the activated control so keyboard users aren't "lost" after an action.
• Don't rely just on drag handles — ensure alternatives are obvious and usable.