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'.

ui/src/game/CheckScreen.svelte

@@ -4,7 +4,8 @@
   import { handleError, showToast } from '../lib/app.svelte';
   import { t } from '../lib/i18n/index.svelte';
   import { alphabetLetters } from '../lib/alphabet';
-  import { canCheckWord, sanitizeCheckWord } from '../lib/checkword';
+  import { canCheckWord, dictionaryLookupUrl, sanitizeCheckWord } from '../lib/checkword';
+  import { telegramOpenExternalLink } from '../lib/telegram';
   import type { Variant } from '../lib/model';
 
   // Word-check on its own screen: unlimited dictionary lookups, each with a
@@ -57,6 +58,12 @@
       handleError(e);
     }
   }
+  // Inside Telegram, route the dictionary link through the Mini App SDK so Telegram opens it in
+  // its in-app browser instead of the WebView's "open this link?" confirmation; in a plain
+  // browser the anchor's own target=_blank handles it.
+  function openLookup(e: MouseEvent) {
+    if (telegramOpenExternalLink((e.currentTarget as HTMLAnchorElement).href)) e.preventDefault();
+  }
 </script>
 
 <div class="wrap">
@@ -75,7 +82,17 @@
         ? t('game.wordLegal', { word: result.word })
         : t('game.wordIllegal', { word: result.word })}
     </p>
-    <button class="complain" onclick={complain}>{t('game.complain')}</button>
+    <div class="actions">
+      <button class="complain" onclick={complain}>{t('game.complain')}</button>
+      {#if result.legal}
+        <a
+          class="lookup"
+          href={dictionaryLookupUrl(result.word, variant)}
+          target="_blank"
+          rel="noopener noreferrer"
+          onclick={openLookup}>{t('game.lookup')}</a>
+      {/if}
+    </div>
   {/if}
 </div>
 
@@ -120,12 +137,21 @@
   .verdict.bad {
     color: var(--danger, #c0392b);
   }
+  .actions {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+  }
   .complain {
-    align-self: flex-start;
     padding: 8px 14px;
     border: 1px solid var(--border);
     background: var(--surface);
     color: var(--text);
     border-radius: var(--radius-sm);
   }
+  .lookup {
+    color: var(--accent);
+    text-decoration: underline;
+    font-size: 0.95em;
+  }
 </style>