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Placing an auto-numbered element or conductor advances a shared NumerotationContext counter (QETProject::addConductorAutoNum/ addElementAutoNum) as a side effect that sat entirely outside the undo stack. Undoing the placement removed the visible number but left the counter advanced, so every undo of an auto-numbered placement silently burned a number, with no way to get it back short of a manual reset. Adds SetAutoNumContextCommand, a small QUndoCommand storing the old/new NumerotationContext and calling the matching add*AutoNum() setter on undo()/redo() -- the same shape QPropertyUndoCommand already uses next to it in ConductorAutoNumerotation::applyText(). Wires it into the two conductor call sites (the static newProperties(), and numerateNewConductor(), both in ConductorAutoNumerotation) and the element call site (Element::setUpFormula(), called from DiagramEventAddElement::addElement() when a new element is dropped onto a diagram). setUpFormula() now takes an optional parent QUndoCommand; addElement() calls it before pushing its own undo_object so the counter change lands in the same undo macro as the element's placement -- one Ctrl+Z reverts both together, instead of leaving the counter adrift. The project-properties config dialog's own add*AutoNum() calls (editing the numbering rule itself, not a side effect of placing something) are deliberately left untouched, as are the load-time folio-sequential bookkeeping calls in Diagram::loadElmtFolioSeq()/loadCndFolioSeq() and the bulk folio-renumbering passes in QETProject -- none of those run as part of an undoable user gesture. Implements the scope proposed in discussion #608.