message: Use manual padding for `ReactorState` flowchart
diff: @@ -7,6 +7,7 @@ use serde::{Deserialize, Serialize};
  #[cfg_attr(doc, aquamarine::aquamarine)]
  /// ```mermaid
  /// flowchart TD
  +/// %%{init: { 'flowchart': {'diagramPadding':100} }}%%
  /// style Start fill:#66ccff,stroke:#333,stroke-width:4px
  /// style End fill:#66ccff,stroke:#333,stroke-width:4px
  ///
  