Implement the password-store tree sidebar

apps/tui/src/runtime.rs

@@ -54,7 +54,7 @@ mod tests {
         let executor = AsyncExecutor::new();
         let mut app = App::new();
         let token = app.begin_request();
-        executor.submit(token, || Ok(AsyncPayload::Refreshed));
+        executor.submit(token, || Err("test result".to_owned()));
 
         let result = executor
             .receiver