fix(UI): Profile 取消按钮样式、HotEvents 轮播箭头、Dashboard 按钮优化

- Profile: 取消按钮添加深色主题样式 (color, borderColor, hover)
- HotEvents: 轮播箭头添加 user-select: none 防止连续点击选中文本
- Dashboard: "查看更多"按钮改为图标按钮 (IconButton + FiPlus)

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

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

src/views/Community/components/HotEvents/HotEvents.css

@@ -54,6 +54,7 @@
     box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15) !important;
     transition: all 0.3s ease !important;
     z-index: 10 !important;
+    user-select: none !important;  /* 防止连续点击时选中文本 */
 }
 
 .custom-carousel-arrow:hover {

src/views/Dashboard/Center.js

@@ -400,13 +400,13 @@ export default function CenterDashboard() {
                       {followingEvents.length}
                     </Badge>
                   </HStack>
-                  <Button
+                  <IconButton
-                    size="sm"
+                    icon={<FiPlus />}
                     variant="ghost"
+                    size="sm"
                     onClick={() => navigate('/community')}
-                  >
+                    aria-label="添加关注事件"
-                    查看更多
+                  />
-                  </Button>
                 </Flex>
               </CardHeader>
               <CardBody pt={0} flex="1" overflowY="auto">

src/views/Profile/ProfilePage.js

@@ -208,6 +208,10 @@ export default function ProfilePage() {
                             <Button
                                 leftIcon={<CloseIcon />}
                                 variant="outline"
+                                colorScheme="gray"
+                                color="gray.300"
+                                borderColor="gray.500"
+                                _hover={{ bg: 'gray.700', borderColor: 'gray.400' }}
                                 onClick={() => {
                                     setIsEditing(false);
                                     setFormData({