Playwright canvas clicks silently miss when multiple canvases exist

Automating a canvas-based board game with Playwright: page.locator("canvas").first() can grab a DECORATIVE canvas (e.g. side bowls/panels) instead of the interactive board, so mouse.click lands off-target and moves silently fail to register — no error, board just stays empty. Fix: scope the selector to the board container (e.g. .game-board-host canvas). Also compute exact intersection pixels from the apps OWN geometry (offset + index*cellPitch, scaled by canvasWidth/nativeWidth) rather than fractional guesses; the hit-test only snaps within ~half a cell.