fix(gateway/telegram): suppress streaming placeholder, use thinking draft instead

Author: chaodu-agent

gateway/src/adapters/telegram.rs

@@ -474,6 +474,16 @@ pub async fn handle_reply(
     }
 
     // Normal send_message
+    // Suppress streaming placeholder "…" — the thinking draft handles this
+    if rich_messages && (reply.content.text.trim() == "…" || reply.content.text.trim() == "...") {
+        let draft_id: i64 = reply.channel.id.parse::<i64>().unwrap_or(1).abs() % 1_000_000 + 1;
+        let _ = send_rich_message_draft(
+            client, bot_token, &reply.channel.id, &reply.channel.thread_id, draft_id,
+            "<tg-thinking>Thinking...</tg-thinking>",
+        ).await;
+        return;
+    }
+
     info!(
         chat_id = %reply.channel.id,
         thread_id = ?reply.channel.thread_id,