错误公告：无障碍要求
表单和操作错误通过专用的断言式实时区域暴露给辅助技术，具有稳定的消息、去重的通知以及保持触发控件的焦点。
Honors prefers-reduced-motion and explicit user settings by disabling non-essential animation, preserving essential feedback, and documenting per-pattern motion tiers in a testable matrix.