Response keeps loading after large streamed uploads finish

When sending a request with a large streamed upload body, the response timer/loading indicator can continue spinning after the server has already returned and the response body has finished.

This was originally reported in a comment on the SQLite WAL performance thread: https://yaak.app/feedback/posts/enabling-sqlite-wal-mode-for-improved-performance-on-slow-ssd#comment-cmt_WM6tD3uexNhu

Fix: https://github.com/mountain-loop/yaak/pull/498