fix(EventPanel): 优化响应式网格布局

- 调整 Grid templateColumns 响应式断点
- base: 1列 → sm: 2列 → lg: 3列
- 提升大屏幕下的空间利用率

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

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

src/views/Center/components/EventPanel.tsx

@@ -154,7 +154,7 @@ export const EventPanel: React.FC<EventPanelProps> = ({
             </VStack>
           </Center>
         ) : (
-          <Grid templateColumns={{ base: '1fr', md: 'repeat(2, 1fr)' }} gap={{ base: 3, md: 4 }}>
+          <Grid templateColumns={{ base: '1fr', sm: 'repeat(2, 1fr)', lg: 'repeat(3, 1fr)' }} gap={{ base: 3, md: 4 }}>
             {events.map(event => (
               <FUIEventCard
                 key={event.id}