error in login

frontend/assets/js/app.js

@@ -892,6 +892,10 @@ let currentRole = null;
 async function checkSession() {
     try {
         const res = await fetch('/api/session');
+        if (res.redirected || !res.ok) {
+            window.location.replace('/login.php');
+            return;
+        }
         const data = await res.json();
         if (data.loggedin) {
             currentUser = data.username;
@@ -901,10 +905,27 @@ async function checkSession() {
                 document.getElementById('settingsBtn').classList.remove('d-none');
             }
         } else {
-            window.location.href = '/login.php';
+            window.location.replace('/login.php');
         }
     } catch (e) {
-        window.location.href = '/login.php';
+        // Retry once after a brief delay in case of transient network issue
+        setTimeout(async () => {
+            try {
+                const res = await fetch('/api/session');
+                if (!res.ok || res.redirected) throw new Error();
+                const data = await res.json();
+                if (data.loggedin) {
+                    currentUser = data.username;
+                    currentRole = data.role;
+                    document.getElementById('userDisplay').textContent = data.username;
+                    if (data.role === 'admin' || data.admin_count === 0) {
+                        document.getElementById('settingsBtn').classList.remove('d-none');
+                    }
+                    return;
+                }
+            } catch (_) {}
+            window.location.replace('/login.php');
+        }, 500);
     }
 }