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@@ -2018,17 +2018,24 @@
       updateAuthUI(null);
     }
 
+    const HF_EXPIRY_BUFFER_MS = 5 * 60_000; // 5 minutes
+
     function isHfTokenExpired(oauthResult) {
       if (!oauthResult?.accessTokenExpiresAt) return false;
-      // Treat as expired 60s early to avoid edge-case 401s
-      return new Date(oauthResult.accessTokenExpiresAt).getTime() - 60_000 < Date.now();
+      return new Date(oauthResult.accessTokenExpiresAt).getTime() - HF_EXPIRY_BUFFER_MS < Date.now();
     }
 
     function scheduleHfExpiry(oauthResult) {
       if (_hfExpiryTimer) clearTimeout(_hfExpiryTimer);
       if (!oauthResult?.accessTokenExpiresAt) return;
-      const ms = new Date(oauthResult.accessTokenExpiresAt).getTime() - 60_000 - Date.now();
-      if (ms <= 0) return;
+      const expiresAt = new Date(oauthResult.accessTokenExpiresAt).getTime();
+      const ms = expiresAt - HF_EXPIRY_BUFFER_MS - Date.now();
+      if (ms <= 0) {
+        // Already expired or about to — sign out now
+        hfSignOut();
+        return;
+      }
+      console.log(`HF token expires at ${new Date(expiresAt).toISOString()}, auto-signout in ${Math.round(ms / 60_000)}m`);
       _hfExpiryTimer = setTimeout(() => {
         console.warn('HF OAuth token expired, signing out automatically.');
         hfSignOut();