Collapsible thinking box with details/summary, thinking on by default

- Thinking box uses <details>/<summary> — collapsed by default, expands on click
- Simple __status header shown before content arrives (no expand needed)
- show_thinking checkbox default changed to True

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

app.py

@@ -118,8 +118,9 @@ async def respond(message, history, show_thinking, user_id, use_tts, run_ids):
 
             # 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)
+                if not thinking_acc:
+                    yield history, "", None, run_ids, _status_html(token["__status"])
+                # thinking_acc에 내용 있으면 기존 표시 유지
                 continue
 
             # 사고 과정(LLM thinking) — 박스에 추가
@@ -228,21 +229,35 @@ def delete_doc(source):
 
 # ── UI 구성 ──────────────────────────────────────────────────────
 
-_THINKING_STYLE = (
+_BOX_STYLE = (
     "background:#f9f9f9;border-left:3px solid #bbb;border-radius:6px;"
-    "padding:10px 14px;max-height:220px;overflow-y:auto;"
-    "font-size:0.85em;color:#555;white-space:pre-wrap;margin-bottom:6px;"
+    "padding:8px 14px;margin-bottom:6px;"
+)
+_CONTENT_STYLE = (
+    "margin-top:8px;white-space:pre-wrap;font-size:0.85em;"
+    "color:#555;max-height:200px;overflow-y:auto;"
 )
 
 
 def _thinking_html(text: str, done: bool = False) -> str:
+    """접기/펼치기 가능한 사고 과정 박스."""
     icon = "💭" if done else "🤔"
     label = "분석 완료" if done else "분석 중..."
     cursor = "" if done else " ▌"
     return (
-        f'<div style="{_THINKING_STYLE}">'
-        f"<strong>{icon} {label}</strong><br><br>"
-        f"{_html.escape(text)}{cursor}</div>"
+        f'<details style="{_BOX_STYLE}">'
+        f'<summary style="cursor:pointer;font-weight:bold;">{icon} {label}</summary>'
+        f'<div style="{_CONTENT_STYLE}">{_html.escape(text)}{cursor}</div>'
+        f'</details>'
+    )
+
+
+def _status_html(status: str) -> str:
+    """내용 없이 상태만 표시하는 단순 헤더."""
+    return (
+        f'<div style="{_BOX_STYLE}">'
+        f'<strong>🤔 {_html.escape(status)}</strong>'
+        f'</div>'
     )
 
 
@@ -282,7 +297,7 @@ with gr.Blocks(title="율봇") as demo:
             transcribe_btn = gr.Button("음성 → 텍스트 변환", scale=1)
 
         with gr.Row():
-            show_thinking = gr.Checkbox(label="사고 과정 표시", value=False)
+            show_thinking = gr.Checkbox(label="사고 과정 표시", value=True)
             use_tts = gr.Checkbox(label="음성으로 답변 읽기 (TTS)", value=False)
             reset_btn = gr.Button("대화 초기화", size="sm")