When the viewport is wider than tall (matchMedia orientation: landscape) the
game screen switches from the portrait stack to a two-column layout: the board
fills the right column as the largest square that fits the height (no zoom,
shrinking by width when cramped — lowest priority), while the left panel stacks
the rack (+ make), the status line, the score plaques, the always-open docked
history and the controls. Board zoom, the history slide-drawer gestures and the
growing nav bar are gated off in landscape; the portrait layout is unchanged and
both render from the same snippets so behaviour stays single-sourced.
The mock e2e now defaults to a portrait viewport (the mobile-first app the
gesture/zoom/history specs are written for); landscape.spec.ts covers the wide
layout in its own viewport.