meeting page frontend fixes

www/app/lib/routes.ts

@@ -1 +1,7 @@
-export const roomUrl = (roomName: string) => `/${roomName}`;
+import { NonEmptyString } from "./utils";
+
+export const roomUrl = (roomName: NonEmptyString) => `/${roomName}`;
+export const roomMeetingUrl = (
+  roomName: NonEmptyString,
+  meetingId: NonEmptyString,
+) => `${roomUrl(roomName)}/${meetingId}`;