Fix: Issues and style fixes related to the 'Memory' page (#12469)

### What problem does this PR solve?

Fix:  Some bugs
- Issues and style fixes related to the 'Memory' page
- Data source icon replacement
- Build optimization

### Type of change

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

web/src/pages/agents/index.tsx

@@ -109,7 +109,7 @@ export default function Agents() {
                 <DropdownMenu>
                   <DropdownMenuTrigger>
                     <Button>
-                      <Plus className="mr-2 h-4 w-4" />
+                      <Plus className="h-4 w-4" />
                       {t('flow.createGraph')}
                     </Button>
                   </DropdownMenuTrigger>