first commit

base/next.js/15.2.2/components/topbar.js

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+"use client";
+
+import { useEffect, useState } from "react";
+import { useRouter } from "next/navigation";
+
+export default function Topbar() {
+  const [username, setUsername] = useState("");
+  const router = useRouter();
+
+  useEffect(() => {
+    // Get username from cookie on client side
+    const getCookie = (name) => {
+      const value = `; ${document.cookie}`;
+      const parts = value.split(`; ${name}=`);
+      if (parts.length === 2) return parts.pop().split(";").shift();
+    };
+
+    const usernameFromCookie = getCookie("next_username");
+    setUsername(usernameFromCookie || "");
+  }, []);
+
+  const handleLogout = () => {
+    // Delete auth cookies
+    document.cookie =
+      "next_username=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";
+    document.cookie =
+      "next_password=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;";
+    router.push("/login");
+  };
+
+  return (
+    <div className="d-flex align-items-center">
+      <span className="me-3">Welcome, {username}</span>
+      <button className="btn btn-danger" onClick={handleLogout}>
+        Logout
+      </button>
+    </div>
+  );
+}