feat(report): render MD tables on the report

[spencerwozniak]

Currently, MD for tables does not convert to pretty MD

[zeapsu]

Great Sage table wisdom: structured knowledge deserves structured rendering. 🧙‍♂️

Agreed. Table rendering matters for research reports, especially for comparisons, paper matrices, timelines, experiment summaries, and structured notes.

One wrinkle: if reports move toward an HTML-first representation, then table rendering may belong in the report renderer rather than as only a Markdown parsing fix. That said, supporting Markdown tables is still useful because generated reports, exports, and imported notes will likely contain GitHub-flavored Markdown tables.

Recommendation:

• Support GitHub-flavored Markdown tables in the current ReportView
• Keep the implementation compatible with a possible future HTML report artifact
• Avoid unsafe raw HTML rendering unless sanitized

Acceptance criteria:

• Markdown tables render cleanly in the dark UI
• Tables remain readable on narrow widths
• Exported Markdown keeps valid table syntax
• No unsanitized HTML injection