fix: escape newlines in get_messages instead of switching to JSON

Replace the JSON output approach with a non-breaking fix: escape newlines
in message text (\n → \\n) to preserve the existing pipe-delimited format.
This fixes multi-line message parsing without breaking downstream consumers.

main.py

@@ -727,34 +727,20 @@ async def get_messages(chat_id: Union[int, str], page: int = 1, page_size: int =
         messages = await client.get_messages(entity, limit=page_size, add_offset=offset)
         if not messages:
             return "No messages found for this page."
-        result = []
+        lines = []
         for msg in messages:
             sender_name = get_sender_name(msg)
-            entry = {
-                "id": msg.id,
-                "sender": sender_name,
-                "date": str(msg.date),
-                "text": msg.message,
-            }
+            reply_info = ""
             if msg.reply_to and msg.reply_to.reply_to_msg_id:
-                entry["reply_to"] = msg.reply_to.reply_to_msg_id
-            # Engagement metrics (views, forwards, reactions)
-            engagement = {}
-            views = getattr(msg, "views", None)
-            if views is not None:
-                engagement["views"] = views
-            forwards = getattr(msg, "forwards", None)
-            if forwards is not None:
-                engagement["forwards"] = forwards
-            reactions = getattr(msg, "reactions", None)
-            if reactions is not None:
-                results = getattr(reactions, "results", None)
-                if results:
-                    engagement["reactions"] = sum(getattr(r, "count", 0) or 0 for r in results)
-            if engagement:
-                entry["engagement"] = engagement
-            result.append(entry)
-        return json.dumps(result, ensure_ascii=False, default=json_serializer)
+                reply_info = f" | reply to {msg.reply_to.reply_to_msg_id}"
+
+            engagement_info = get_engagement_info(msg)
+            safe_text = (msg.message or "").replace("\n", "\\n")
+
+            lines.append(
+                f"ID: {msg.id} | {sender_name} | Date: {msg.date}{reply_info}{engagement_info} | Message: {safe_text}"
+            )
+        return "\n".join(lines)
     except Exception as e:
         return log_and_format_error(
             "get_messages", e, chat_id=chat_id, page=page, page_size=page_size