fix(LamNI): unambiguous confirmation wording, freeze frame before click

- Reword the extended-loop accept/iterate prompt: the old either/or
  phrasing made a "yes" answer ambiguous about which half it affirmed.
- Freeze a single frame (and close the shutter/live-view per
  keep_shutter_open) before requesting the rotation-centre click, same
  as every other click site in this file -- previously the shutter and
  5 Hz live view stayed on for the whole time the operator was
  deciding where to click, exposing the sample for no benefit.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

csaxs_bec/bec_ipython_client/plugins/LamNI/x_ray_eye_align.py

@@ -848,6 +848,7 @@ class XrayEyeAlign:
                     "Watch the sample rotate and locate the stationary rotation centre..."
                 )
                 self._live_sweep([180, 0])
+                self.update_frame(keep_shutter_open)
                 self.movement_buttons_enabled(True, True)
                 center_x, center_y = self._collect_click(
                     1,
@@ -868,8 +869,7 @@ class XrayEyeAlign:
                 self.update_frame(keep_shutter_open)
                 answer = (
                     input(
-                        "Are you happy with this alignment, or shall we do another iteration? "
-                        "[Y/n]: "
+                        "Alignment acceptable -- stop here? [Y/n] (n = run another iteration): "
                     )
                     .strip()
                     .lower()