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/agents/index.tsx

@@ -39,6 +39,7 @@ export default function Agents() {
           title="Agents"
           searchString={searchString}
           onSearchChange={handleInputChange}
+          icon="agent"
         >
           <Button onClick={navigateToAgentTemplates}>
             <Plus className="mr-2 h-4 w-4" />