- The "icone" widget no longer appears as a generic tile in "Ajouter un élément sur l'écran" / "Ajouter DANS ce conteneur" — the icon gallery (now living under "Ajouter un élément sur l'écran" in the left panel instead of the right one) is the only way to add one, always pre-set to the icon you picked.
- The element tree now supports dragging an element onto a container row to move it inside (last child), from anywhere in the tree — not just reordering within the same parent. Hovering a container row splits it into before/after/inside zones (thirds) when dragging a sibling, or "inside only" when dragging from elsewhere in the tree. New move_element_to_container() rejects non-container targets and cycles (dropping a container into itself or one of its own descendants) silently, mirroring reorder_element's existing safety pattern.
Verified end to end: gallery renders in the left panel with no icone tile in the widget grids, and the move endpoint correctly reparents, rejects a cycle, and rejects a non-container target. Full suite green (89).
william
33a887e7ba