Feat: Restore the button's background color #3221 (#9307)

### What problem does this PR solve?

Feat: Restore the button's background color #3221
### Type of change


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

web/src/pages/next-searches/search-card.tsx

@@ -15,7 +15,7 @@ export function SearchCard({ data }: IProps) {
   const { navigateToSearch } = useNavigatePage();
 
   return (
-    <Card className="bg-colors-background-inverse-weak  border-colors-outline-neutral-standard">
+    <Card className="border-colors-outline-neutral-standard">
       <CardContent className="p-4 flex gap-2 items-start group">
         <div className="flex justify-between mb-4">
           <RAGFlowAvatar