fix(09): match export UI styles and fix backend user_id error

backend/routers/admin/exports.py

@@ -61,7 +61,7 @@ async def export_inventory_snapshot(
     # Log export action
     from backend.models import AuditLog
     audit_entry = AuditLog(
-        user_id=admin_user.id,
+        user_id=admin_user.sub,
         action="EXPORT_INVENTORY_SNAPSHOT",
         details=f"Exported in {format_type} format",
     )
@@ -113,7 +113,7 @@ async def export_audit_trail(
 
     # Log export action
     audit_entry = AuditLog(
-        user_id=admin_user.id,
+        user_id=admin_user.sub,
         action="EXPORT_AUDIT_TRAIL",
         details=f"Exported in {format_type} format",
     )
@@ -211,7 +211,7 @@ async def export_db(
 
     # Log export action
     audit_entry = AuditLog(
-        user_id=admin_user.id,
+        user_id=admin_user.sub,
         action="EXPORT_DB",
         details=f"Exported {type} in {format_type} format",
     )