xref: add option to hide terminal names in cross-references

Add a new boolean property 'showTerminalName' (default: true) to
XRefProperties, with full persistence in XML and QSettings.

A new checkbox "Afficher les numéros de bornes dans les Xrefs" is
added to the XRefPropertiesWidget in the main display group (not in
the cross-only group), so it is active in both Cross and Contacts modes.

When unchecked, terminal names are hidden in all three rendering paths:
  - drawContact()            (Contacts mode: NO/NC/SW symbols)
  - fillCrossRef()           (Cross mode: NO and NC columns)
  - setUpCrossBoundingRect() (Cross mode: bounding rect sizing)

Backward compatible: existing project files without the attribute
default to showTerminalName=true (no visual change).

Files changed:
  sources/properties/xrefproperties.h
  sources/properties/xrefproperties.cpp
  sources/ui/xrefpropertieswidget.ui
  sources/ui/xrefpropertieswidget.cpp
  sources/qetgraphicsitem/crossrefitem.cpp

sources/ui/xrefpropertieswidget.ui

@@ -108,6 +108,13 @@
        <layout class="QHBoxLayout" name="horizontalLayout_3">
         <item>
          <layout class="QVBoxLayout" name="verticalLayout_2">
+          <item>
+           <widget class="QCheckBox" name="m_show_terminal_name_cb">
+            <property name="text">
+             <string>Afficher les numéros de bornes dans les Xrefs</string>
+            </property>
+           </widget>
+          </item>
           <item>
            <widget class="QRadioButton" name="m_display_has_contacts_rb">
             <property name="text">
@@ -283,6 +290,7 @@
   <tabstop>m_master_le</tabstop>
   <tabstop>m_slave_le</tabstop>
   <tabstop>m_show_power_cb</tabstop>
+  <tabstop>m_show_terminal_name_cb</tabstop>
   <tabstop>m_power_prefix_le</tabstop>
   <tabstop>m_delay_prefix_le</tabstop>
   <tabstop>m_switch_prefix_le</tabstop>