Handle __status tokens for instant thinking box feedback

__status tokens show immediately in the thinking box but do not
accumulate in thinking_acc. When real content (__meta/__thinking)
arrives it overwrites the status message naturally.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app.py

@@ -116,6 +116,12 @@ async def respond(message, history, show_thinking, user_id, use_tts, run_ids):
                 collected_run_id = run_id
                 break
 
+            # 즉시 상태 표시 — thinking_acc에 누적하지 않음 (임시 메시지)
+            if isinstance(token, dict) and "__status" in token:
+                status_text = (thinking_acc + "\n\n" + token["__status"]) if thinking_acc else token["__status"]
+                yield history, "", None, run_ids, _thinking_html(status_text)
+                continue
+
             # 사고 과정(LLM thinking) — 박스에 추가
             if isinstance(token, dict) and "__thinking" in token:
                 thinking_acc += token["__thinking"]