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Refonte complète du layout grid: - _computePanePositions: positions explicites (row/col/span) selon n et layout - _createPaneAt: grid-row/grid-column explicites sur chaque .pane-container - _addAllResizeHandles: handles placés aux bonnes positions grid - _rebuildResizeHandles: nettoie et recrée les handles après add/remove - closePane: repositionne les panneaux restants + rebuild handles - 3 panneaux horizontal: 2 en haut, 1 pleine largeur en bas - 3 panneaux vertical: 1 pleine hauteur à gauche, 2 à droite - 4 panneaux: grille 2×2 Fix aussi: _addPane avec positions explicites + rebuild handles