Hide account link for anonymous users in PageHeader

- Add useSession hook from next-auth/react
- Conditionally render account icon link only when user is authenticated
- Anonymous users on public pages will not see the account button

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/ui/PageHeader.tsx

@@ -5,18 +5,22 @@ import Link from "next/link";
 import { SelectLanguage } from "./SelectLanguage";
 import AccountCircle from "@mui/icons-material/AccountCircle";
 import { useLocale } from "next-intl";
+import { useSession } from "next-auth/react";
 
 export const PageHeader = () => {
     const locale = useLocale();
+    const { data: session } = useSession();
     
     return (
     <div className="navbar bg-base-100 mb-6">
         <Link className="btn btn-ghost text-xl" href={`/${locale}/home`}><Image src="/icon3.png" alt="logo" width={48} height={48} /> Režije</Link>
         <span className="grow">&nbsp;</span>
         <SelectLanguage />
+        {session && (
             <Link href={`/${locale}/home/account/`} className="btn btn-ghost btn-circle">
                 <AccountCircle  />
             </Link>
+        )}
     </div>
     );
 }