Quick check: put the pointer on the dot, and one limit for learning

After the quick check's capture, in gaze mode, the dot stays where it is in the
room (the panel's new "lock") and the gaze has the pointer again. You put the
pointer on the dot as you'd correct a click, with the mouse or Meta+J and the
head. That click clicks nothing: the helper sends it as "calverify", learned
whatever its size. Over POINTER_GAZE_NUDGE_MAX, the capture runs again, up to
3 times. A right click or Meta+K skips it.

POINTER_GAZE_NUDGE_MAX is now the one limit: 15 degrees by default (was 8),
and ft-gazed's own limits (8 for SteamVR's tracker, 25 for ours) follow it. A
keyboard correction past it isn't learned but opens a quick check ("recheck"),
in place of the 30 degree keyboard limit.

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

session/frametop.conf.example

@@ -29,7 +29,7 @@ POINTER_LEASH_RETURN=0.2   # head follow: once it comes along, how quickly (s) t
 POINTER_FOLLOW_REACH=70    # head follow: how far (degrees) from the middle of your view the mouse can move the cursor
 POINTER_GAZE=0             # 1 = the pointer goes where you look, the mouse does the last bit (needs the gaze service: gaze/run.sh install)
 POINTER_GAZE_RETAKE=5      # gaze mode: how far (degrees) you look away from the pointer before the gaze takes it back from the mouse
-POINTER_GAZE_NUDGE_MAX=8   # gaze mode: a mouse nudge up to this far (degrees) before a click is learned as the eye tracker's error
+POINTER_GAZE_NUDGE_MAX=15  # gaze mode: a correction up to this far (degrees) before a click is learned as the eye tracker's error; a bigger one with a keyboard click, or at the quick check, runs the quick check again
 POINTER_GAZE_HOLD=0.5      # gaze mode: a press held this long (s) without moving becomes a real press (to drag); moved or released sooner, it clicks where you let go
 POINTER_GAZE_DOT=always    # gaze mode: the dot shows all the time (always) | only while the mouse moves it (moving)
 POINTER_GAZE_SHOW=1        # gaze mode, with POINTER_GAZE_DOT=moving: the dot shows this long (s) after the mouse moves it; also while a press is held, and a pulse per click