show client username, check whether credential exists before requesting confirmation from frontend

src-tauri/src/credentials/mod.rs

@@ -139,3 +139,10 @@ pub trait PersistentCredential: for<'a> Deserialize<'a> + Sized {
         Ok(creds)
     }
 }
+
+
+pub fn random_uuid() -> Uuid {
+    // a bit weird to use salt() for this, but it's convenient
+    let random_bytes = Crypto::salt();
+    Uuid::from_slice(&random_bytes[..16]).unwrap()
+}