Description of the new feature / enhancement

Introduce a new content block type, PlainTextContent, as an alternative to the existing MarkdownContent. This block should automatically escape any Markdown syntax, ensuring that all input is rendered as literal plain text.

This enhancement would simplify displaying content that is not intended to be parsed as Markdown, eliminating the need for manual escaping or implementing custom cards for basic plain text scenarios.

Scenario when this would be used?

Displaying external content that may contain special characters or Markdown-like syntax.

Safely rendering user-entered text, logs, or data from untrusted sources, without accidental formatting.

Any case where a developer wants to show literal text without risk of Markdown interpretation.

Supporting information

No response