feat(ui): external dictionary lookup link on the word-check tool

When a checked word is found, show a 'look it up' text link beside the
complaint button that opens an external reference dictionary in a new tab:
gramota.ru for the Russian variants, scrabblewordfinder.org for English
(word lower-cased and percent-encoded). The link hides for a word that is
not found. Inside Telegram it routes through the Mini App SDK's openLink, so
Telegram opens it directly instead of the WebView's 'open this link?'
confirmation; in a browser the anchor's own target=_blank handles it.

Relabel the complaint button to 'Возражаю' (ru); English stays 'Disagree'.

docs/FUNCTIONAL.md

@@ -111,7 +111,9 @@ an existing word (down a column or across a row) is accepted. A play is validate
 against the game's dictionary at submit time and scored; an unlimited preview
 reports the word(s) a tentative move would form and its score, or that it is not
 legal, and the move is offered for submission only once it is confirmed legal. The dictionary check tool is
-unlimited and offers a complaint on any result. Hints are governed per game —
+unlimited and offers a complaint on any result; for a word it finds, it also links out to an
+external reference dictionary (gramota.ru for Russian games, scrabblewordfinder.org for
+English) to look it up. Hints are governed per game —
 whether they are allowed and how many each player starts with — and draw on a
 personal hint wallet once the per-game allowance is spent. The game ends when the
 bag empties and a player clears their rack, after 6 consecutive scoreless turns,