fix(auth): keep expiry dialog above agent UI

src/components/auth/SessionExpiryDialog.tsx

@@ -13,6 +13,7 @@ import {
   Stack,
   Typography,
 } from "@mui/material";
+import { useTheme } from "@mui/material/styles";
 
 import { useAuthStore } from "@/store/authStore";
 
@@ -25,6 +26,7 @@ type SessionExpiryDialogProps = {
 export const SessionExpiryDialog = ({
   expiresAt,
 }: SessionExpiryDialogProps) => {
+  const theme = useTheme();
   const sessionExpired = useAuthStore((state) => state.sessionExpired);
   const reason = useAuthStore((state) => state.sessionExpiryReason);
   const [now, setNow] = useState(() => Date.now());
@@ -61,6 +63,7 @@ export const SessionExpiryDialog = ({
   return (
     <Dialog
       open={isOpen}
+      style={{ zIndex: theme.zIndex.tooltip + 1 }}
       disableEscapeKeyDown={sessionExpired}
       onClose={sessionExpired ? undefined : () => setWarningDismissed(true)}
       aria-labelledby="session-expiry-dialog-title"