fix: 纵向模式右侧详情滚动条改为常显

- 从 hover 显示改为始终显示 (1px)
- 用户反馈更倾向于始终可见的滚动条
- 提供持续的滚动位置反馈

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/views/Community/components/DynamicNewsCard/EventScrollList.js

@@ -319,19 +319,17 @@ const EventScrollList = ({
                 css={{
                   overscrollBehavior: 'contain',
                   '&::-webkit-scrollbar': {
-                    width: '4px',
+                    width: '1px',
                   },
                   '&::-webkit-scrollbar-track': {
-                    background: 'transparent',
-                  },
-                  '&::-webkit-scrollbar-thumb': {
-                    background: 'transparent',
+                    background: scrollbarTrackBg,
                     borderRadius: '10px',
                   },
-                  '&:hover::-webkit-scrollbar-thumb': {
+                  '&::-webkit-scrollbar-thumb': {
                     background: scrollbarThumbBg,
+                    borderRadius: '10px',
                   },
-                  '&:hover::-webkit-scrollbar-thumb:hover': {
+                  '&::-webkit-scrollbar-thumb:hover': {
                     background: scrollbarThumbHoverBg,
                   },
                 }}