fix(mermaid): themechange detector + expand simplification

Jacky Zhao

2025-03-11 87b803790c10dde62cbc5452014c619eced5b36b

 docs/advanced/making plugins.md

@@ -99,8 +99,6 @@
            },
          ],
        }
      } else {
        return {}
      }
    },
  }