New widget where each tab is a real "conteneur" element posed as a child
(see screens/elements/add_tab.py) — this reuses everything that already
exists for a normal container (adding a Répéteur/Conteneur/etc. inside via
"Ajouter DANS ce conteneur", renaming to change the tab's visible label,
deleting via the standard trash icon) instead of inventing a separate
storage format for tabs.
The widget's own properties panel gets a dedicated "Onglets" section to
add a tab, rename one, jump to its content, or delete it. Rendering
(render_onglets.py) builds a tab bar + one panel per tab, switched
client-side (forgeShowTab, in both screen_edit.html and play.html) with
only one panel visible at a time.
Distinct from the existing "activer_onglet" flow action (2.3, manual
show-one/hide-siblings) — that stays available for custom show/hide
wiring; this widget is the turnkey version with tab management built in.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
The "Éléments de cet écran" tree now renders every level of nesting
(previously stopped after one level of children) as a compact single-line
list, and right-clicking a row opens a context menu to duplicate the
element (and its full subtree) in place, in its current container.
Also: all property panels start collapsed instead of some being open by
default, the redundant nested element list inside "Ajouter DANS ce
conteneur" is removed (it only needs the widget picker), and the
now-unneeded "a container is selected" warning banner is gone.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>