Support third‑party Sphinx directives (e.g., mermaid) in ubcode-rst-lint

[DukeOfKirkcaldy]

Is your feature request related to a problem? Please describe.
When using ubcode-rst-lint inside VS Code, any .. mermaid:: directive triggers the following warning:

This directive is provided by the sphinxcontrib-mermaid extension, which is commonly used in Sphinx-based documentation projects. The linter currently does not recognize it even when the extension is enabled in the project’s Sphinx configuration.

Describe the solution you'd like
I would like ubcode-rst-lint to recognizs and accept the mermaid directive when the sphinxcontrib-mermaid extension is listed in the Sphinx configuration. Ideally, the linter should automatically load and respect third‑party Sphinx directives declared in conf.py.

Describe alternatives you've considered
I tried to suppress the warning for the mermaid directive, but it can only be disabled globally. This would cause all unknown directive warnings to be hidden, not just the Mermaid-related ones.

Additional context
None.

[PhilipPartsch]

Hi @DukeOfKirkcaldy,
thanks for the hint. You can whitelist / ignore the directive with ignore_directives in your toml configuration file.
Maybe this will help you until mermaid is completely supported by ubcode.