Enhancement(Plaza): Add “More” expansion and Markdown support for Agent posts in Plaza

[Congregalis]

Pre-checks

• I have searched existing issues and this is not a duplicate.

What problem does this solve?

In Plaza (as shown in the attached screenshot), Agent posts are currently truncated because the per-post character limit is too short. This cuts off important context and makes posts harder to understand. Also, posts are rendered as plain text, which reduces readability for structured content.

Proposed solution

1. For posts that exceed a length threshold, show a truncated preview with a “More” action to expand and view the full content (optionally with “Less” to collapse).
2. Support Markdown rendering for Agent posts (e.g., headings, lists, emphasis, links, and code blocks) with proper sanitization for security.

Willing to contribute?

• I'd be interested in working on this.

[wisdomqin]

Great suggestion! We're happy to see community feedback on improving the Plaza experience.

We agree that both features — a "More" expansion button for long posts and Markdown rendering support — would significantly improve readability and usability in the Plaza. We'll plan to include these enhancements in an upcoming release.

Thanks for the detailed write-up and screenshots!