fix(LamNI,flomni): FZP diameter/zone-width wrongly blanked to N/A

fzp_diameter_um/fzp_zone_width_nm were read inside the same try block
as the focal-distance calculation, which also needs energy_kev. When
the photon energy read fails (as it does in at least one simulated
session -- confirmed live: dev.ccm_energy unavailable), the exception
wiped out the diameter/zone-width display too, even though those come
from config (loptx/foptx userParameter) and were read just fine.
Split into two independent try blocks: diameter/zone-width no longer
depend on a working energy read, only the focal distance itself does.

csaxs_bec/bec_ipython_client/plugins/LamNI/lamni.py

@@ -2168,19 +2168,23 @@ class LamNI(TomoQueueMixin, LamNIAlignmentMixin, LamNIOpticsMixin, LamniGuiTools
         except Exception:
             energy_kev = None
             energy_str = "N/A"
-        # FZP focal distance: same formula as lfzp_info(), from the
-        # diameter/outermost-zone-width userParameter on loptx (see device
-        # config) and the current photon energy above.
+        # FZP diameter/outermost-zone-width: userParameter on loptx (see
+        # device config) -- independent of the energy read above, so a
+        # failed energy read shouldn't blank these out too.
         try:
             fzp_diameter_um = self._get_user_param_safe("loptx", "fzp_diameter")
             fzp_zone_width_nm = self._get_user_param_safe("loptx", "fzp_outermost_zone_width")
+        except Exception:
+            fzp_diameter_um = fzp_zone_width_nm = "N/A"
+        # FZP focal distance: same formula as lfzp_info(), from the values
+        # above and the current photon energy -- only this needs energy_kev.
+        try:
             wavelength_m = 1.2398e-9 / energy_kev
             focal_distance_mm = (
                 fzp_diameter_um * 1e-6 * fzp_zone_width_nm * 1e-9 / wavelength_m * 1000
             )
             focal_distance_str = f"{focal_distance_mm:.2f}"
         except Exception:
-            fzp_diameter_um = fzp_zone_width_nm = "N/A"
             focal_distance_str = "N/A"
         # FZP focus-to-sample distance: same live z-stage-based calculation
         # lfzp_info() already uses -- not a stored value.

csaxs_bec/bec_ipython_client/plugins/flomni/flomni.py

@@ -3799,19 +3799,23 @@ class Flomni(
         except Exception:
             energy_kev = None
             energy_str = "N/A"
-        # FZP focal distance: same formula as ffzp_info(), from the
-        # diameter/outermost-zone-width userParameter on foptx (see device
-        # config) and the current photon energy above.
+        # FZP diameter/outermost-zone-width: userParameter on foptx (see
+        # device config) -- independent of the energy read above, so a
+        # failed energy read shouldn't blank these out too.
         try:
             fzp_diameter_um = self._get_user_param_safe("foptx", "fzp_diameter")
             fzp_zone_width_nm = self._get_user_param_safe("foptx", "fzp_outermost_zone_width")
+        except Exception:
+            fzp_diameter_um = fzp_zone_width_nm = "N/A"
+        # FZP focal distance: same formula as ffzp_info(), from the values
+        # above and the current photon energy -- only this needs energy_kev.
+        try:
             wavelength_m = 1.2398e-9 / energy_kev
             focal_distance_mm = (
                 fzp_diameter_um * 1e-6 * fzp_zone_width_nm * 1e-9 / wavelength_m * 1000
             )
             focal_distance_str = f"{focal_distance_mm:.2f}"
         except Exception:
-            fzp_diameter_um = fzp_zone_width_nm = "N/A"
             focal_distance_str = "N/A"
         # FZP focus-to-sample distance: same live z-stage-based calculation
         # ffzp_info() already uses -- not a stored value.