replace void.cat with nostr.build

src/utils/createBlobFromFile.ts

@@ -1,6 +1,8 @@
 import { readBinaryFile } from '@tauri-apps/api/fs';
 
-export async function createBlobFromFile(path: string): Promise<Blob> {
+export async function createBlobFromFile(path: string): Promise<Uint8Array> {
   const file = await readBinaryFile(path);
-  return new Blob([file]);
+  const blob = new Blob([file]);
+  const arr = new Uint8Array(await blob.arrayBuffer());
+  return arr;
 }