feat: replace the graph icon in the header #918 (#1376)

### What problem does this PR solve?

feat: replace the graph icon in the header #918

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/layouts/components/header/index.less

@@ -52,4 +52,6 @@
 }
 .radioButtonIcon {
   vertical-align: middle;
+  max-width: 16px;
+  max-height: 16px;
 }

web/src/layouts/components/header/index.tsx

@@ -1,15 +1,15 @@
-import { ReactComponent as StarIon } from '@/assets/svg/chat-star.svg';
 import { ReactComponent as FileIcon } from '@/assets/svg/file-management.svg';
+import { ReactComponent as GraphIcon } from '@/assets/svg/graph.svg';
 import { ReactComponent as KnowledgeBaseIcon } from '@/assets/svg/knowledge-base.svg';
 import { useTranslate } from '@/hooks/commonHooks';
 import { useNavigateWithFromState } from '@/hooks/routeHook';
-import { Layout, Radio, Space, theme } from 'antd';
+import { Flex, Layout, Radio, Space, theme } from 'antd';
 import { useCallback, useMemo } from 'react';
 import { useLocation } from 'umi';
 import Toolbar from '../right-toolbar';
 
 import { useFetchAppConf } from '@/hooks/logicHooks';
-import { NodeIndexOutlined } from '@ant-design/icons';
+import { MessageOutlined } from '@ant-design/icons';
 import styles from './index.less';
 
 const { Header } = Layout;
@@ -26,8 +26,8 @@ const RagHeader = () => {
   const tagsData = useMemo(
     () => [
       { path: '/knowledge', name: t('knowledgeBase'), icon: KnowledgeBaseIcon },
-      { path: '/chat', name: t('chat'), icon: StarIon },
-      { path: '/flow', name: t('flow'), icon: NodeIndexOutlined },
+      { path: '/chat', name: t('chat'), icon: MessageOutlined },
+      { path: '/flow', name: t('flow'), icon: GraphIcon },
       { path: '/file', name: t('fileManager'), icon: FileIcon },
     ],
     [t],
@@ -75,13 +75,13 @@ const RagHeader = () => {
               onClick={() => handleChange(item.path)}
               key={item.name}
             >
-              <Space>
+              <Flex align="center" gap={8}>
                 <item.icon
                   className={styles.radioButtonIcon}
                   stroke={item.name === currentPath ? 'black' : 'white'}
                 ></item.icon>
                 {item.name}
-              </Space>
+              </Flex>
             </Radio.Button>
           ))}
         </Radio.Group>