fix: wire NF signal connections at startup; add live ring redraw on BC/Lsd change

nf_qt.py:
  - Moved frameScrolled, cursorMoved, dataStatsUpdated, and col_group
    signal connections from _on_font_changed into _wire_signals where
    they belong. They were accidentally nested in the font handler and
    only fired when font size changed — causing MinI/MaxI to never update.

ff_asym_qt.py:
  - _draw_rings reads BC_Y, BC_Z, Lsd directly from text fields
  - editingFinished on BC_Y/BC_Z/Lsd triggers automatic ring redraw

Author: marinerhemant

gui/ff_asym_qt.py

@@ -634,6 +634,10 @@ def _wire_signals(self):
         self.image_view.frameScrolled.connect(self._on_frame_scroll)
         # Cursor tracking
         self.image_view.cursorMoved.connect(self._on_cursor_moved)
+        # Live ring redraw on BC/Lsd change
+        self.bcy_edit.editingFinished.connect(self._redraw_if_rings)
+        self.bcz_edit.editingFinished.connect(self._redraw_if_rings)
+        self.lsd_edit.editingFinished.connect(self._redraw_if_rings)
         self.image_view.dataStatsUpdated.connect(self._on_stats_updated)
 
     def _show_help(self):
@@ -908,17 +912,30 @@ def _load_and_display(self):
 
     # ── Rings ──────────────────────────────────────────────────────
 
+    def _redraw_if_rings(self):
+        if self.show_rings and self.ring_rads:
+            self._draw_rings()
+
     def _draw_rings(self):
         self.image_view.clear_overlays()
         if not self.ring_rads:
             return
         px = self.pixel_size
+        # Always read current values from text fields
+        try:
+            bc_y = float(self.bcy_edit.text())
+            bc_z = float(self.bcz_edit.text())
+            lsd = float(self.lsd_edit.text())
+        except ValueError:
+            return
+        self.bc_local = [bc_y, bc_z]
+        self.lsd_local = lsd
         colors = _color_cycle_colors
-        print(f"[Rings] BC_Y={self.bc_local[0]}, BC_Z={self.bc_local[1]}, "
-              f"Lsd={self.lsd_local}, Lsd_orig={self.lsd_orig}, px={px}")
+        print(f"[Rings] BC_Y={bc_y}, BC_Z={bc_z}, "
+              f"Lsd={lsd}, Lsd_orig={self.lsd_orig}, px={px}")
         for idx, rad in enumerate(self.ring_rads):
-            Y, Z = compute_ring_points(rad, self.lsd_local, self.lsd_orig,
-                                        self.bc_local, px)
+            Y, Z = compute_ring_points(rad, lsd, self.lsd_orig,
+                                        [bc_y, bc_z], px)
             print(f"  Ring {idx}: rad={rad:.1f}, center=({Y.mean():.1f}, {Z.mean():.1f}), "
                   f"Y=[{Y.min():.1f}..{Y.max():.1f}], Z=[{Z.min():.1f}..{Z.max():.1f}]")
             color = colors[idx % len(colors)]

gui/nf_qt.py

@@ -518,15 +518,15 @@ def _wire_signals(self):
             lambda n: self.image_view.set_colormap(n))
         self.theme_combo.currentTextChanged.connect(
             lambda t: apply_theme(QtWidgets.QApplication.instance(), t))
-
-    def _on_font_changed(self, size):
-        QtWidgets.QApplication.instance().setStyleSheet(f'* {{ font-size: {size}pt; }}')
         self.image_view.frameScrolled.connect(
             lambda d: self.frame_spin.setValue(self.frame_spin.value() + d))
         self.image_view.cursorMoved.connect(self._on_cursor_moved)
         self.image_view.dataStatsUpdated.connect(self._on_stats_updated)
         self.col_group.buttonClicked.connect(self._on_col_mode_changed)
 
+    def _on_font_changed(self, size):
+        QtWidgets.QApplication.instance().setStyleSheet(f'* {{ font-size: {size}pt; }}')
+
     def _show_help(self):
         QtWidgets.QMessageBox.information(self, 'NF Viewer — Controls',
             'Mouse Controls:\n'