Add button to access auction page from the home screen

Add a new button to the landing page that navigates to the auctions page, accessible even when logged out.

Replit-Commit-Author: Agent
Replit-Commit-Session-Id: 069d4324-6c40-4355-955e-c714a50de1ea
Replit-Commit-Checkpoint-Type: full_checkpoint
Replit-Commit-Screenshot-Url: https://storage.googleapis.com/screenshot-production-us-central1/3df548ff-50ae-432f-9be4-25d34eccc983/069d4324-6c40-4355-955e-c714a50de1ea/9tQ591o

client/src/pages/Landing.tsx

@@ -150,6 +150,15 @@ export default function Landing() {
                 />
               </div>
               
+              <Button 
+                variant="ghost" 
+                size="sm"
+                onClick={() => window.location.href = "/auctions"}
+                data-testid="button-auctions"
+              >
+                Auctions
+              </Button>
+              
               <DropdownMenu>
                 <DropdownMenuTrigger asChild>
                   <Button