Move the head-follow cursor only after the head passes the leash

Easing the reference toward the head all the time moved the cursor on
every small head movement, so a cursor parked in a corner of the view
drifted. Now nothing moves while the head stays within the leash. Once
the head has been past it for POINTER_LEASH_DELAY (0.2 s, so a glance
out and back doesn't count), the reference eases all the way to where
you face (POINTER_LEASH_RETURN) and the cursor lands back in its place
in the view, then the leash waits again. Leaning inside the leash no
longer moves the cursor either. Leash 0 stays head-locked.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

input-settings/ft_input_settings.py

@@ -54,6 +54,7 @@ POINTER_SETTINGS = [
     ("POINTER_SCENE_RADIUS", "Dock / window-control reach", 0.5, 0.1, 1.5, 0.05, "m"),
     ("POINTER_EDGE_REACH", "Panel edge reach", 0.3, 0.0, 1.0, 0.05, "m"),
     ("POINTER_LEASH_DEG", "Head follow leash", 10, 0, 60, 1, "°"),
+    ("POINTER_LEASH_DELAY", "Head follow delay", 0.2, 0.0, 1.0, 0.05, "s"),
     ("POINTER_LEASH_RETURN", "Head follow catch-up", 0.2, 0.05, 2.0, 0.05, "s"),
     ("POINTER_FOLLOW_REACH", "Head follow reach", 70, 20, 85, 1, "°"),
     ("POINTER_WAKE_COUNTS", "Movement to wake", 40, 5, 200, 5, "counts"),