feat(precedents): split library into court rulings + appeals committee tables

- /api/precedent-library now accepts source_kind param (default external_upload)
- list_external_case_law returns chair_name/district fields
- LibraryListPanel renders two separate tables with appropriate columns
- internal_decisions migration: added queue_halachot param to defer extraction
- Fixed practice_area mapping from style_corpus (appeals_committee → proper enum)

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

web/app.py

@@ -4262,13 +4262,15 @@ async def precedent_library_list(
     precedent_level: str = "",
     source_type: str = "",
     search: str = "",
+    source_kind: str = "external_upload",
     limit: int = 100,
     offset: int = 0,
 ):
     rows = await db.list_external_case_law(
         practice_area=practice_area, court=court,
         precedent_level=precedent_level, source_type=source_type,
-        search=search, limit=limit, offset=offset,
+        search=search, source_kind=source_kind,
+        limit=limit, offset=offset,
     )
     return {"items": rows, "count": len(rows)}