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/lib/telegram.test.ts

@@ -1,5 +1,11 @@
 import { afterEach, describe, expect, it, vi } from 'vitest';
-import { insideTelegram, telegramClosingConfirmation, telegramLaunch, telegramRequestFullscreen } from './telegram';
+import {
+  insideTelegram,
+  telegramClosingConfirmation,
+  telegramLaunch,
+  telegramOpenExternalLink,
+  telegramRequestFullscreen,
+} from './telegram';
 
 function stubWebApp(initData: string, startParam?: string) {
   vi.stubGlobal('window', {
@@ -100,3 +106,18 @@ describe('telegramRequestFullscreen', () => {
     }
   });
 });
+
+describe('telegramOpenExternalLink', () => {
+  afterEach(() => vi.unstubAllGlobals());
+
+  it('routes an external URL through the SDK openLink inside Telegram', () => {
+    const openLink = vi.fn();
+    vi.stubGlobal('window', { Telegram: { WebApp: { openLink } } });
+    expect(telegramOpenExternalLink('https://gramota.ru/poisk?query=кот')).toBe(true);
+    expect(openLink).toHaveBeenCalledWith('https://gramota.ru/poisk?query=кот');
+  });
+
+  it('returns false without the SDK so the caller falls back to the anchor', () => {
+    expect(telegramOpenExternalLink('https://x.io')).toBe(false);
+  });
+});