Message Logger: comments of deleted channel posts

The comments button of a deleted post opens the app's own comments section
(discussion thread), its history request answered locally from the logged
comments; the input bar is replaced by a "Viewing deleted comments" notice.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

README.md

@@ -11,6 +11,9 @@ Shows what a [telegram-panel](../../telegram-panel) message logger saved, native
   for the history topic in the activity group. Versions and their media are read from the activity group through
   a signed-in account that can (the current one, the master, or any member); otherwise the
   server's text is shown and media are marked unavailable;
+- the comments button of a deleted channel post (whose thread Telegram deletes with it) opens
+  the app's own comments section for it — avatars, names, replies, media — filled from the
+  logged comments (the thread's history request is answered locally);
 - message links into a chat the current account isn't in (e.g. a log post's "Message" link)
   open that chat as a signed-in account that is in it; going back returns to your account.
   Every signed-in account's chats are cached client-side for this.