fix(ui): offline in-game — usable dictionary check + hide (not disable) resign/chat

Two fixes from contour testing of the offline-in-game UX:

- The dictionary word check was unusable offline (Check button disabled) when the
  panel was reached while already offline: CheckScreen fetched the variant + pinned
  version over the network in onMount, which fails offline, leaving the default
  variant so input sanitising stripped every letter. Seed both from the cached game
  (present once the board has opened) so the input and the on-device dawg fallback
  work without a round-trip; the network refresh still runs when online and on a
  cold deep-link.
- The resign and chat controls were only functionally disabled (chat) or not gated
  at all (resign) offline, so they still looked active. Hide both while offline,
  matching the frozen social controls.

Tests: the in-game offline e2e now asserts the drawer action icons are hidden (not
disabled); a new e2e guards the offline dictionary flow. Docs updated.

docs/ARCHITECTURE.md

@@ -124,8 +124,8 @@ dropped). Horizontal scaling is explicit future work.
   switch and no device-local create paths. The machine still tracks reachability there, though: a
   connection lost **inside an online game** is surfaced on **every platform**, driven off the machine's
   confirmed-offline state (`netState.offline`, not `offlineMode.active`) — the game screen shows a
-  *connection lost* banner and **freezes** the tray, the move controls, the add-friend/block controls and
-  the chat/dictionary entry (a started move stays a draft, re-committed by the player on reconnect), and
+  *connection lost* banner, **freezes** the tray and move controls, and hides the resign, add-friend/block
+  and chat/dictionary controls (a started move stays a draft, re-committed by the player on reconnect), and
   the word-check tool falls back to the game's pinned on-device dictionary (`ui/src/lib/dict/check.ts`,
   exact when that dawg is cached, else *unavailable*) with its network-only complaint and external
   look-up hidden.

docs/FUNCTIONAL.md

@@ -328,8 +328,9 @@ offline, so you are never interrupted for a hiccup.
 **Losing the connection while inside an online game** is surfaced on **every platform, including the
 Telegram/VK mini-apps** — unlike the offline-play mode above, which is web/native only — because an
 online game needs the server for every move. A slim *connection lost* banner appears at the top of the
-board and the play area **freezes**: the rack, the move controls, the add-friend/block controls and the
-chat/dictionary entry all disable, while a move you had started stays on the board as a draft. Nothing
+board and the play area **freezes**: the rack and the move controls disable, and the resign, the
+add-friend/block and the chat/dictionary controls are hidden, while a move you had started stays on the
+board as a draft. Nothing
 is sent; when the connection returns the banner clears, the controls come back and you commit the move
 yourself. If you were already in the chat or the dictionary when the drop happened you stay there — chat
 becomes read-only (send and nudge disable) and the dictionary keeps checking words against the game's

docs/FUNCTIONAL_ru.md

@@ -332,8 +332,9 @@ e-mail) либо ввод фразы. Активные игры форфейтя
 **Потеря связи внутри онлайн-партии** показывается на **всех платформах, включая мини-приложения
 Telegram/VK** — в отличие от офлайн-режима игры выше, который только для веба и нативного приложения, —
 потому что онлайн-партии сервер нужен на каждый ход. Сверху доски появляется тонкий баннер *связь
-потеряна*, и игровая область **замораживается**: рэк, ходовые кнопки, кнопки «в друзья»/«заблокировать»
-и вход в чат/словарь отключаются, а начатый ход остаётся на доске черновиком. Ничего не отправляется;
+потеряна*, и игровая область **замораживается**: рэк и ходовые кнопки отключаются, а «сдаться»,
+«в друзья»/«заблокировать» и вход в чат/словарь скрываются; начатый ход остаётся на доске черновиком.
+Ничего не отправляется;
 когда связь возвращается, баннер исчезает, кнопки оживают, и ход отправляешь ты сам. Если связь упала,
 когда ты уже был в чате или словаре, ты там и остаёшься — чат становится «только для чтения» (отправка
 и nudge отключаются), а словарь продолжает проверять слова по словарю партии на устройстве.