meeting page frontend fixes

www/app/components/MeetingMinimalHeader.tsx

@@ -5,9 +5,10 @@ import NextLink from "next/link";
 import Image from "next/image";
 import { useRouter } from "next/navigation";
 import { roomUrl } from "../lib/routes";
+import { NonEmptyString } from "../lib/utils";
 
 interface MeetingMinimalHeaderProps {
-  roomName: string;
+  roomName: NonEmptyString;
   displayName?: string;
   showLeaveButton?: boolean;
   onLeave?: () => void;