feat(ui): route all in-app external links through Telegram openLink

Extend the openLink routing from the dictionary lookup to every external
link shown inside the Mini App, so none triggers the WebView's 'open this
link?' confirmation. A shared onExternalLinkClick handler resolves the anchor
via closest() (so it also works delegated on {@html} content), backed by a
pure routeExternalLinkInTelegram decision: only inside Telegram, only an
external http(s) target=_blank link, excluding same-origin/in-app and t.me
links (t.me keeps openTelegramLink). Applied to the word-check lookup, the
About rules link, the Feedback operator-reply links, and the feature-gated
announcement banner.

Outside Telegram every anchor keeps its native target=_blank.

ui/src/screens/About.svelte

@@ -3,6 +3,7 @@
   import { app } from '../lib/app.svelte';
   import { navigate } from '../lib/router.svelte';
   import { aboutContent } from '../lib/aboutContent';
+  import { onExternalLinkClick } from '../lib/telegram';
 
   // The auto-match move clock (mirrors backend game.DefaultTurnTimeout = 24h).
   const AUTO_MATCH_HOURS = 24;
@@ -13,7 +14,7 @@
 <div class="page">
   <h1>{c.title}</h1>
   <p>
-    {c.rulesPrefix}<a href={c.rulesUrl} target="_blank" rel="noopener noreferrer">{c.rulesLink}</a>.
+    {c.rulesPrefix}<a href={c.rulesUrl} target="_blank" rel="noopener noreferrer" onclick={onExternalLinkClick}>{c.rulesLink}</a>.
   </p>
 
   <section>

ui/src/screens/Feedback.svelte

@@ -7,6 +7,7 @@
   import { connection } from '../lib/connection.svelte';
   import { clientChannel } from '../lib/channel';
   import { attachmentError, linkify, MAX_BODY } from '../lib/feedback';
+  import { onExternalLinkClick } from '../lib/telegram';
   import type { FeedbackState } from '../lib/model';
 
   // The feedback screen: a message (+ optional single attachment) the player sends to
@@ -123,7 +124,7 @@
     {#if view?.reply}
       <section class="reply">
         <h2>{t('feedback.replyTitle')}</h2>
-        <p class="replybody">{#each replySegments as seg, i (i)}{#if seg.href}<a href={seg.href} target="_blank" rel="noopener noreferrer">{seg.text}</a>{:else}{seg.text}{/if}{/each}</p>
+        <p class="replybody">{#each replySegments as seg, i (i)}{#if seg.href}<a href={seg.href} target="_blank" rel="noopener noreferrer" onclick={onExternalLinkClick}>{seg.text}</a>{:else}{seg.text}{/if}{/each}</p>
       </section>
     {/if}
   </div>