fix: convert tables containing bullet lists to Markdown (#6)

[aqueeb]

Summary

Fixes #6 — Confluence tables whose cells contain a bullet/numbered list were left as raw HTML instead of a Markdown table.

Root cause: pandoc's GFM writer can only place inline, single-line content in pipe-table cells. When a cell holds block-level content (a <ul>/<ol> list), pandoc can't express it as a pipe table and falls back to emitting the entire table as raw HTML. (Hard <br> breaks in a cell trigger the same fallback — which is why the existing code already strips them.)

Fix: In converter/markdown.go, flatten in-cell lists to inline • item / N. item segments before pandoc runs, joined by a @@C2MDBR@@ sentinel. postProcessMarkdown restores the sentinel to a literal <br> as its final step, so pandoc emits a clean pipe table and GitHub still renders line-broken bullets inside the cell. Cells without lists keep their existing space-joined behavior (no regression).

Before

<table>
<tbody>
<tr><th><strong>title 1</strong></th><th><strong>title 2</strong></th></tr>
<tr><td>left side:<ul><li>foo</li><li>bar</li></ul></td><td>right side</td></tr>
</tbody>
</table>

After

| **title 1**                  | **title 2** |
|------------------------------|-------------|
| left side:<br>• foo<br>• bar | right side  |

Tests

• New unit tests: unordered list, ordered list numbering, list-free cell (regression guard), sentinel→<br>.
• New end-to-end ConvertHTMLToMarkdown test on the issue's exact table shape (asserts a pipe table, no <table>/<ul>).
• Full go test ./... passes; gofmt/go vet clean.
• Verified against the reporter's testpage.doc.

Limitation

Deeply nested sub-lists inside a cell flatten to a single bullet level (items preserved as text, no indentation) — acceptable for typical Confluence tables and noted in a code comment.

🤖 Generated with Claude Code

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Codecov Report

❌ Patch coverage is 94.11765% with 3 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
converter/markdown.go	94.11%	2 Missing and 1 partial ⚠️

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