Fixed a slow memory leak that could grow the desktop window's memory use over long sessions. The header clock now updates once a minute instead of every second, which keeps memory flat across multi-hour sessions. As a side effect the clock no longer shows seconds — a live-seconds display will return in a future update.
Improvements
Reduced graphics memory growth during long sessions by reusing overlay textures instead of constantly recreating them, keeping memory use bounded over hours of continuous use.