fix: set selected index for figure controls after new figure is gener…

…ated

When creating a blank figure, the GUI was not automatically opening/selecting the new figure tab. This was because the selected index was only being set for the figure tabs but not the figure control tabs. This made them not synchronous, and when the two tab groups are later linked, it reverted to the un-updated index.

hnn_core/gui/_viz_manager.py

@@ -777,6 +777,7 @@ def _add_figure(b, widgets, data, template_type, scale=0.95, dpi=96):
 
     data['figs'][fig_idx] = fig
     widgets['figs_tabs'].selected_index = n_tabs
+    widgets['axes_config_tabs'].selected_index = n_tabs
     data['fig_idx']['idx'] += 1