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Add a 'Grid lines' preference (default off): when off the board drops the 1px grid gaps for a gapless checkerboard (plain cells alternate shades; tiles get rounded corners and a soft right-side shadow so adjacent gapless tiles still read apart), saving ~14px of width. When on, the classic lined grid returns. Persisted with the other board-style prefs; wired through Board's new lines prop. e2e locks the default and the toggle.