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>

input-settings/main.qml

@@ -1053,12 +1053,13 @@ Kirigami.ApplicationWindow {
                 padding: Kirigami.Units.largeSpacing
                 wrapMode: Text.Wrap
                 opacity: 0.7
-                text: "Map a mouse button (Buttons) or a controller button (Controllers) to \"Gaze pointer on/off\" "
+                text: "Map a mouse button (Buttons) or a key combination (Keyboard) to \"Gaze pointer on/off\" "
                       + "to switch it on the fly. A click waits for the release: if the gaze is off, drag onto the target "
                       + "with the button held and let go there. Hold still to drag: hold a press this long without moving "
                       + "to drag something instead. Look away to hand back: how far from the pointer you look before the "
-                      + "gaze takes it back from the mouse. Largest nudge to learn: bigger mouse moves before a click "
-                      + "are treated as using the mouse, not correcting the gaze. Eye tracker: SteamVR's, or our own "
+                      + "gaze takes it back from the mouse. Largest correction to learn: bigger mouse moves before a click "
+                      + "are treated as using the mouse, not correcting the gaze; a bigger correction with a keyboard "
+                      + "click, or at the quick check, runs the quick check again. Eye tracker: SteamVR's, or our own "
                       + "(gaze/tracker), which keeps its own calibration (Calibrate… with Own tracker). Eye bias: the gaze "
                       + "combines both eyes, since their errors partly cancel; Left or Right counts that eye twice as "
                       + "much, and Auto weights each by how far off it was at your recent nudges."