Markdown code blocks render as inline code instead of code blocks

[moltar]

Problem

When posting messages with content_type: "text/markdown", multiline fenced code blocks are incorrectly rendered as separate inline code snippets instead of a single code block.

Example

Input markdown:

```
foo
bar
```

Expected: A single multiline code block in Slack

Actual: Two separate inline code snippets: foo bar

Root Cause

The upstream library github.com/takara2314/slack-go-util (v0.2.0) incorrectly converts fenced code blocks.

• Current behavior: Uses RichTextSection with style: {code: true} which creates inline code formatting
• Correct behavior: Should use RichTextPreformatted which creates proper preformatted code blocks

Location in this codebase

pkg/handler/conversations.go:174:

blocks, err := slackGoUtil.ConvertMarkdownTextToBlocks(params.text)

Fix

PR submitted to upstream: takara2314/slack-go-util#1

Workaround

Until the upstream fix is merged and a new version released, users can:

1. Use content_type: "text/plain" and format code blocks manually using Slack's mrkdwn syntax
2. Or pin to a fork with the fix applied

[moltar]

That upstream PR has been merged. We need to update the version used here.

[korotovsky]

Ref: #147