phsl / new-api

- Make Y-axis scrollbar visible for .table-scroll-card .semi-card-body
- Reduce scrollbar width from 6px to 4px for a more subtle appearance
- Decrease scrollbar opacity from 0.3 to 0.2 for lighter color
- Adjust hover opacity from 0.5 to 0.35 for consistent lighter theme
- Remove previous scrollbar hiding styles to improve user experience

This change improves the usability of table scroll cards by providing
visual feedback for scrollable content while maintaining a clean,
unobtrusive design aesthetic.