v0.2.3

Added

• Help → Check for updates… queries the latest GitHub Release, compares server to the running app, and can open the release page or download the Windows .exe to your Downloads folder. The built app also checks automatically about once per week (after a short delay on startup) when a new check is due.
• last_update_check_iso in settings.json records the last successful GitHub check.

Fixed

• Background workers: Worker signal objects are parented to the main window and cleaned up after delivery so QueuedConnection slots always run on the GUI thread without hanging or losing the signal when the thread pool deletes the runnable.