ClearNoticeVertical class

A centered vertical notice with an optional top icon and rich text body.

This widget is useful for empty states or explanatory hints where text may need mixed styles via InlineSpan.

Usage:

ClearNoticeVertical(
  text: const TextSpan(
    text: '尚無資料，請稍後再試',
  ),
  color: Colors.grey,
)

Rich text example:

ClearNoticeVertical(
  icon: const Icon(Icons.school_outlined),
  text: TextSpan(
    children: [
      const TextSpan(text: '請先完成 '),
      TextSpan(
        text: '課程加選',
        style: TextStyle(
          color: Theme.of(context).colorScheme.primary,
          fontWeight: FontWeight.w700,
        ),
      ),
      const TextSpan(text: ' 後再查看。'),
    ],
  ),
)