2a83079007
Adds KEY_EVENT_SECOND_TICK, generated once per real second from Clock_IncMS() via a new second_tick_flag and pushed through the normal event queue, so every foreground App's onEvent() receives it and decides independently whether to act. Removes the old global inactivity_timer (60s sleep from anywhere) entirely. HomeApp now accumulates its own idle-second counter and sleeps after 10s idle specifically while on the home screen; MenuApp's existing 10s auto-close is converted from onRun() polling to the same tick+reset pattern for consistency. Any non-tick key event resets each app's own counter to 0.