feat(ui): 단계별 현황 재설계 — 완료 가시화 + 빈 단계 숨김 (사용자 피드백)

'대기만 보이고 성공은 안 보인다' 피드백 반영:
- overview 에 stages[] 노출 (stage 별 done_today + oldest_pending_age, SQL 1필드 추가)
- 게이지 의미 전환: 단계 간 대기량 비교(amber) → 단계 내 오늘 진척(완료=green 비율,
  가득 찬 초록 = 다 끝남) + 처리 중 pulse dot
- 움직임 없는 단계는 행 제거, 하단 '비어 있음: ...' 한 줄로
- 라벨 누수 fix: details 가 구 STAGE_LABEL 을 쓰던 것 → queueStageLabel 통일
  (deep_summary/markdown/summarize/chunk/fulltext 한글화)
- 헤더: 오늘 N 완료(성공 가시화) · 실패(error) · 대기. 데이터 소스 = overview 단일화

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/services/queue_overview.py

@@ -68,7 +68,7 @@ def _zero_stage() -> dict:
     return {
         "pending": 0, "processing": 0, "failed": 0,
         "done_1h": 0, "done_today": 0, "done_15m": 0,
-        "deferred_pending": 0, "created_1h": 0,
+        "deferred_pending": 0, "created_1h": 0, "oldest_pending_at": None,
     }
 
 
@@ -85,6 +85,7 @@ def rows_to_stage_stats(rows) -> dict[str, dict]:
             "done_15m": int(row[6] or 0),
             "deferred_pending": int(row[7] or 0),
             "created_1h": int(row[8] or 0),
+            "oldest_pending_at": row[9] if len(row) > 9 else None,
         }
     return stats
 
@@ -231,6 +232,35 @@ def build_trend(
     return trend
 
 
+def build_stages(stage_stats: dict[str, dict], now=None) -> list[dict]:
+    """단계별 현황 행 — '단계 상세' 패널용 (2026-06-11 사용자 피드백: 완료가 보여야 한다).
+
+    파이프라인 순서 유지, 미지 stage 는 뒤에. 숨김/강조 판단은 FE 몫 — 여기선 사실만.
+    oldest_pending_age_sec = 가장 오래된 pending 의 경과 초 (pending 없으면 None).
+    """
+    from datetime import datetime, timezone
+    now = now or datetime.now(timezone.utc)
+    extra = [s for s in stage_stats if s not in _STAGE_ORDER]
+    rows = []
+    for stage in [*_STAGE_ORDER, *extra]:
+        st = stage_stats.get(stage) or _zero_stage()
+        oldest = st.get("oldest_pending_at")
+        age = None
+        if oldest is not None:
+            if oldest.tzinfo is None:
+                oldest = oldest.replace(tzinfo=timezone.utc)
+            age = max(0, int((now - oldest).total_seconds()))
+        rows.append({
+            "stage": stage,
+            "pending": st["pending"],
+            "processing": st["processing"],
+            "failed": st["failed"],
+            "done_today": st["done_today"],
+            "oldest_pending_age_sec": age,
+        })
+    return rows
+
+
 def build_totals(stage_stats: dict[str, dict]) -> dict:
     """전 stage 합계."""
     return {
@@ -255,6 +285,7 @@ def compose_overview(
         "machines": build_machines(
             stage_stats, summarize_split, current_rows, deep_enabled=deep_enabled
         ),
+        "stages": build_stages(stage_stats),
         "summarize_eta": build_summarize_eta(stage_stats),
         "trend_24h": build_trend(inflow_buckets, done_buckets, now_kst),
         "totals": build_totals(stage_stats),
@@ -280,7 +311,8 @@ _STAGE_STATS_SQL = """
                            AND payload ->> 'deferred_until' IS NOT NULL
                            AND (payload ->> 'deferred_until')::timestamptz > NOW())
                                                                             AS deferred_pending,
-        COUNT(*) FILTER (WHERE created_at > NOW() - INTERVAL '1 hour')      AS created_1h
+        COUNT(*) FILTER (WHERE created_at > NOW() - INTERVAL '1 hour')      AS created_1h,
+        MIN(created_at) FILTER (WHERE status = 'pending')                    AS oldest_pending_at
     FROM processing_queue
     GROUP BY stage
 """