move @snort/nostr code into System

packages/app/src/Element/DmWindow.tsx

@@ -1,6 +1,6 @@
 import "./DmWindow.css";
 import { useEffect, useMemo, useRef } from "react";
-import { TaggedRawEvent } from "@snort/nostr";
+import { TaggedRawEvent } from "System";
 
 import ProfileImage from "Element/ProfileImage";
 import DM from "Element/DM";