Added a standalone static HTML/WebGL export via
export_static_app().
Added an embeddable standalone applet article and pkgdown home-page
iframe.
Added configurable preview horizons, horizon-specific high scores,
autoplay helpers, strategy benchmarks, and growth-focused lookahead
support.
Fixed cascade resolution so active-tile merges are followed by
deterministic board-wide by-product merge scans until the board is
stable. This keeps the Rcpp and standalone browser engines aligned when
gravity creates adjacent equal-value tiles away from the active
tile.