Message Logger: hidden messages on the server, removed chats, old chat photos

- Hidden deleted messages are marked on the server (local marks migrated);
  "Reveal hidden messages" in the chat menu, Unhide in the message menu and
  the selection bar.
- Chats an account lost are reported, listed among its chats again and
  opened read-only with their logged messages, all deleted.
- Logged chat photos: a removed chat's avatar, and in a chat's photos the
  ones it no longer has, translucent with a trash icon in the viewer's
  previews.
- Fix: the deleted-post comments thread is answered locally again.

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

src/api.py

@@ -152,3 +152,70 @@ class Api:
             for _token, result in self._each("POST", "/deletions", json=body):
                 marked += int((result or {}).get("marked", 0))
         return marked
+
+    def hidden(self, account_id, chat_id, message_ids, hidden):
+        """Hide messages from the chat for every client (or show them again);
+        True once every master took it."""
+        ids = sorted(set(int(i) for i in message_ids))
+        for start in range(0, len(ids), 500):
+            body = {
+                "account_id": account_id,
+                "chat_id": chat_id,
+                "message_ids": ids[start : start + 500],
+                "hidden": bool(hidden),
+            }
+            for _token, _result in self._each("POST", "/hidden", json=body):
+                pass
+        return True
+
+    # removed chats
+
+    def chat_removed(self, account_id, chat_id, own):
+        body = {"account_id": account_id, "chat_id": chat_id, "own": bool(own)}
+        known = False
+        for _token, result in self._each("POST", "/chats/removed", json=body):
+            known = known or bool((result or {}).get("known"))
+        return known
+
+    def chat_hidden(self, account_id, chat_id, hidden):
+        body = {"account_id": account_id, "chat_id": chat_id, "hidden": bool(hidden)}
+        for _token, _result in self._each("POST", "/chats/hidden", json=body):
+            pass
+
+    def removed_chats(self, account_id):
+        """The account's removed chats, each master's answer merged (the
+        first one listing a chat wins), or None when no master answered."""
+        chats, any_result = {}, False
+        for _token, result in self._each(
+            "GET", "/chats/removed", params={"account_id": account_id}
+        ):
+            if result is None:
+                continue
+            any_result = True
+            for chat in result.get("chats") or []:
+                chat["master_tg_id"] = result.get("master_tg_id")
+                chats.setdefault(int(chat["chat_id"]), chat)
+        return list(chats.values()) if any_result else None
+
+    def history(self, account_id, chat_id, before=0, limit=100):
+        """Logged messages of a chat older than `before`, newest first: the
+        first master that has any."""
+        params = {"account_id": account_id, "before": int(before), "limit": int(limit)}
+        for _token, result in self._each(
+            "GET", f"/chats/{chat_id}/history", params=params
+        ):
+            if result and result.get("messages"):
+                return result
+        return None
+
+    def avatars(self, account_id, chat_id):
+        """Chat photos logged for a chat, newest first, every master's."""
+        out = []
+        for _token, result in self._each(
+            "GET", f"/chats/{chat_id}/avatars", params={"account_id": account_id}
+        ):
+            for avatar in (result or {}).get("avatars") or []:
+                avatar["master_tg_id"] = (result or {}).get("master_tg_id")
+                out.append(avatar)
+        out.sort(key=lambda a: a.get("date") or "", reverse=True)
+        return out