fix: only add nostr: for valid nip19

src/components/PostEditor/utils.ts

@@ -1,6 +1,13 @@
+import { nip19 } from 'nostr-tools'
+
 export function preprocessContent(content: string) {
   const regex = /(?<=^|\s)(nevent|naddr|nprofile|npub)[a-zA-Z0-9]+/g
   return content.replace(regex, (match) => {
-    return `nostr:${match}`
+    try {
+      nip19.decode(match)
+      return `nostr:${match}`
+    } catch {
+      return match
+    }
   })
 }