ba23994c68
Box-drawing characters (│┃║┌┐└┘├┤etc) are designed to connect between lines but the font's em-box is smaller than our line-height (14px vs 16.8px), creating visible gaps. Solution: Render box-drawing characters as separate text elements with a vertical scale transform of 1.2 (matching line-height) to stretch them to fill the full cell height and connect properly. This fixes disconnected vertical lines and corners in TUI applications.