Rendering of `&` characters in ToC

[Paulchen5]

Describe the bug

When using the [[toc]] feature the & is replaced by &. But this prevents the right formatting of other HTML character entities like &npsp; etc.

Reproduction

[[toc]]

## Example Headeing with HTML character entity → in it

Expected behavior

Rendering the → as an arrow instead of → (in html →)

System Info

System:
    OS: macOS 15.6
    CPU: (x) arm64 Apple M2
    Memory: 0 MB / X.xx GB
    Shell: x.x - /bin/zsh
  Binaries:
    Node: 22.16.0 - ~/.nvm/versions/node/v22.16.0/bin/node
    Yarn: 1.22.22 - ~/.nvm/versions/node/v22.16.0/bin/yarn
    npm: 11.4.2 - ~/.nvm/versions/node/v22.16.0/bin/npm
    pnpm: 10.14.0 - ~/.nvm/versions/node/v22.16.0/bin/pnpm
  Browsers:

Additional context

No response

Validations

• Check if you're on the latest VitePress version.
• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.

[Sepush]

• install a decode lib eg. html-entities
• use markdown.toc.format option to custom the format rule

expample code

// .vitepress/config.ts
import { decode } from 'html-entities'

export default defineConfig({
  markdown: {
    toc:{
      format(str) {
        return decode(str);
      }
    },
 }
})