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ispyisail
a245411f9f
Adds a toggleable, visual-only background frame to help proportion an element's drawing against a representative folio surface, instead of guessing against a bare grid. Follows the exact precedent of the existing hotspot indicator (ElementScene::drawForeground()): drawn by ElementView::drawBackground(), centered on the same origin, and never written to the saved .elmt file. - "Afficher le cadre de fond" toggles the frame on/off. - "Taille du cadre de fond..." opens a small width/height dialog to resize it, defaulting to a representative folio's drawable area derived from BorderProperties::defaultProperties() (columns_count * columns_width by rows_count * rows_height). - Both the visibility and the last-used size persist via QSettings, the same way the existing grid-dot rendering prefs (elementeditor/grid_pointsize_min/max) already do. Implements the scope proposed in discussion #604.