Ryan Malloy
ba8859cc31
Replace time.sleep() with threading.Event.wait() in all poll loops so worker threads exit immediately on shutdown instead of blocking for up to 500ms per iteration. Fixes the on_unmount crash (NoMatches from querying removed DOM nodes) by signaling the event directly rather than iterating child widgets. Three shutdown paths covered: q key (on_unmount), Ctrl+C (try/finally in main), and Textual internal shutdown.