fix(telegram): evaluate native-dialog availability at fire time

The deep-link info modals (stale invite, welcome-on-redeem) captured
insideTelegram() && telegramDialogsAvailable() in a const at component init, but they
mount in App before bootstrap loads the SDK, so the value was always false and they
fell back to the in-app Modal even inside Telegram. Evaluate it at fire time (in the
effect and the {#if} guard), as the destructive confirms already do at click time.

ui/src/components/StaleInviteModal.svelte

@@ -11,10 +11,6 @@
   // Split the message around the {bot} token so the bot handle renders as an inline link.
   const parts = $derived(t('friends.staleInvite').split('{bot}'));
 
-  // Inside the Mini App with native popups, present the notice as Telegram's own popup instead of
-  // the in-app modal.
-  const useNative = insideTelegram() && telegramDialogsAvailable();
-
   function openBot() {
     if (username) {
       const url = `https://t.me/${username}`;
@@ -25,12 +21,14 @@
     dismissStaleInvite();
   }
 
-  // Native path: raise Telegram's popup when the notice appears; its "open bot" button opens the
-  // bot chat, any other dismissal just clears the notice. The `shown` guard fires it once per notice.
+  // Native path: when the notice fires inside the Mini App with native popups, present Telegram's
+  // own popup instead of the in-app modal. insideTelegram()/dialogs are evaluated at fire time, not
+  // captured at init: this component mounts before bootstrap loads the SDK, so a captured value
+  // would be stale. The popup's "open bot" button opens the bot chat; any other dismissal clears the
+  // notice; the `shown` guard fires it once per notice.
   let shown = false;
   $effect(() => {
-    if (!useNative) return;
-    if (app.staleInvite && !shown) {
+    if (app.staleInvite && !shown && insideTelegram() && telegramDialogsAvailable()) {
       shown = true;
       void telegramShowPopup(
         botInfoPopup(t('friends.staleInviteTitle'), t('friends.staleInvite'), username ?? '', t('common.ok')),
@@ -41,7 +39,7 @@
   });
 </script>
 
-{#if app.staleInvite && !useNative}
+{#if app.staleInvite && !(insideTelegram() && telegramDialogsAvailable())}
   <Modal title={t('friends.staleInviteTitle')} onclose={dismissStaleInvite}>
     <p class="msg">{parts[0]}{#if username}<button type="button" class="bot" onclick={openBot}>@{username}</button>{/if}{parts[1] ?? ''}</p>
     <button class="ok" onclick={dismissStaleInvite}>{t('common.ok')}</button>