Register the drawing tools so the command search finds them

Ajouter une ligne, un rectangle, une ellipse... had no ShortcutManager
id, so the command search could not list them. Give each one an id with
no default key; they can also be bound in the Shortcuts page now.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

sources/qetdiagrameditor.cpp

@@ -949,6 +949,13 @@ void QETDiagramEditor::setUpActions()
 	add_path->setCheckable(true);
 
 	connect(&m_add_item_actions_group, &QActionGroup::triggered, this, &QETDiagramEditor::addItemGroupTriggered);
+		//No default key, but an id: they can then be found by the command
+		//search and bound in the Shortcuts page, like every other command.
+	for (QAction *action : m_add_item_actions_group.actions()) {
+		ShortcutManager::instance().registerAction(
+			action, "diagrameditor.add_" + action->data().toString(),
+			tr("Éditeur de schémas"), QKeySequence());
+	}
 
 		//Depth action
 	m_depth_action_group = QET::depthActionGroup(this);