Richard Zink
b5b169ae80
Add explicit X-swap marker comment so the user can verify they're seeing the new build. Bump canvas width by 2*256 padding so the X labels (drawn at canvasX + 244) are within the canvas even for the rightmost drawn tile (east, perp=-2 -> canvasX 1152, label at 1396). With wider canvas (1792 vs 1280), labels are visible and the corridor is centred.