Fix: Optimize page layout and style #3221 (#9852)

### What problem does this PR solve?

Fix: Optimize page layout and style #3221

- Added the cursor-pointer class to the logo in the Header component
- Added an icon property to the ListFilterBar in the Agents and ChatList
components
- Adjusted the Dataset page layout and set a minimum width
- Optimized the DatasetWrapper page layout and added the overflow-auto
class
- Simplified the search icon in the SearchList component

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

---------

Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>

web/src/pages/next-chats/index.tsx

@@ -39,6 +39,7 @@ export default function ChatList() {
       <div className="px-8 pt-8">
         <ListFilterBar
           title="Chat apps"
+          icon="chat"
           onSearchChange={handleInputChange}
           searchString={searchString}
         >