Function buildSankeySection

buildSankeySection(
    config: SankeyConfig | null | undefined,
    lang?: string,
    heading?: string,
): string
Generate a Sankey flow chart section as an HTML string with inline SVG.

Returns an empty string when config is null/undefined or has no flows, following the same convention as buildSwotSection and buildDashboardSection.
Parameters
- config: SankeyConfig | null | undefined
  Sankey data (nodes, flows, optional summary).
- lang: string = 'en'
  BCP 47 language code for the section heading.
- Optionalheading: string
  Optional heading override.
Returns string
HTML string for the sankey section, or empty string.
- Defined in src/generators/sankey-content.ts:305