feat: Automatically hide the mouse (cursor) after when not being moved after X seconds

[fooness]

In addition to the mouse-hide-while-typing option, it would be great if the mouse cursor would be automatically hidden after some period of inactivity/resting. In other words: after moving the cursor within Ghostty, i.e. when having stopped moving the cursor, wait for example 5 seconds, then automatically hide the cursor.

[murlidhar]

there are options in other terminal emulators too for this already. ... eg mouse_hide_wait = n no of seconds. the mouse pointer will remain hidden until the mouse is moved.