Feat: Modify the style of the agent page bright theme #3221 (#9162)

### What problem does this PR solve?

Feat: Modify the style of the agent page bright theme #3221

### Type of change


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

web/src/pages/agent/index.tsx

@@ -1,5 +1,4 @@
 import { PageHeader } from '@/components/page-header';
-import { useSwitchToDarkThemeOnMount } from '@/components/theme-provider';
 import {
   Breadcrumb,
   BreadcrumbItem,
@@ -98,8 +97,6 @@ export default function Agent() {
   const { navigateToAgentLogs } = useNavigatePage();
   const time = useWatchAgentChange(chatDrawerVisible);
 
-  useSwitchToDarkThemeOnMount();
-
   return (
     <section className="h-full">
       <PageHeader>