The customCSS field existed on the model, types, and form schema but was
never editable, sent to the API, or rendered. Wire it end to end:
- Accept customCSS in the create/update status page body validation and
regenerate the OpenAPI spec
- Add a Custom CSS editor (multiline field) to the status page form and
include the value in the submitted form data
- Support multiline mode in the shared TextInput component
- Inject the saved CSS via a style tag when rendering the status page
Buco7854
73f95ac8e1