inline code in markdown files isn't highlighted

```console
% bat --version
bat 0.26.1
```

It seems that inline code in markdown files isn't highlighted.

`file.md` content:

```markdown
`inline_code` - description
```

Comparison with other themes:

The screenshot only shows `Catppuccin Mocha` but the same occurs with Latte, Frappe and Macchiato variants.

It would be nice if these were highlighted to make them stand out more in my opinion.

Reproduce the report with bat 0.26.1 using the shown file.md content and compare the Catppuccin Mocha, Latte, Frappe, and Macchiato themes. Locate the theme definitions or Markdown highlighting rules, then verify that inline code is visually distinguished in each variant. Use the screenshot comparison and bat output as the starting reference.

Written by the indexing model from the issue text.