- Highlight tracks the last move overall (not the last word): a trailing
pass/exchange now highlights nothing, so the board no longer lights up the
opponent's old word after our own empty move.
- Make the highlight event-driven: refreshed only on a real game event
(open/refresh, opponent move, our own committed move) and dismissed the moment
composing starts, so recalling a just-placed tile never re-triggers it.
- Localize non-play move-history labels via new move.* catalog keys
(pass/exchange/resign/timeout); the label printed the raw English action.
- Clamp the zoomed board's pan at its edge (overscroll-behavior: none), removing
the native rubber-band past the content.
Tests: lastMoveCells unit coverage (trailing pass/exchange -> empty), i18n RU
label assertions, an e2e overscroll-contract check on the zoomed viewport.