feat(b09): 운반 줄 단가연결 = 거리이정표 연결 · 연결 줄 모음 한 곳(ref_rows) (251-5)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LLCk2y5xE8YGVgjbTntWsY

B09_Estimation/B09_Estimation_Bill_Library.py

@@ -20,6 +20,7 @@ from pathlib import Path
 from typing import Any
 
 from B09_Estimation.B09_Estimation_Store import folder as store_folder
+from B09_Estimation.B09_Estimation_Store import ref_rows
 from common_util.common_util_json import atomic_write_json
 from M02_MasterTemplete import M02_Labor_Ref as refs
 from M02_MasterTemplete.M02_Item_Snapshot import MANIFEST_NAME, build_snapshot, now_text, origin_of
@@ -110,15 +111,11 @@ def copies(project_root: str | Path) -> list[tuple[Path, dict[str, Any]]]:
 
 
 def used_folders(user: dict[str, Any]) -> set[str]:
-    """설계내역서 덮개 줄이 잇는 서고 사본 폴더."""
-    rows = ((user or {}).get("bill") or {}).get("rows") or []
+    """설계내역서 덮개 줄 · 거리이정표 운반 연결(251-5)이 잇는 서고 사본 폴더."""
     return {
         str(ref["lib"])
-        for row in rows
-        if isinstance(row, dict)
-        and isinstance(ref := row.get("ref"), dict)
-        and ref.get("tab") == "dg"
-        and ref.get("lib")
+        for row in ref_rows(user)
+        if isinstance(ref := row.get("ref"), dict) and ref.get("tab") == "dg" and ref.get("lib")
     }