Export retro session summary as Markdown or PDF

[mshadmanrahman]

Problem

After a retrospective, teams want to share the outcomes with stakeholders or store them in Confluence/Notion. Currently there is no way to export the session results.

Proposed Solution

Add an "Export" button that generates a clean Markdown summary of the retro session, including all cards grouped by column, vote counts, and any action items.

Scope for a first contribution

• Add an export button to the session page (visible to facilitator)
• Generate a Markdown file with: session title, date, participants count, cards grouped by column, vote counts, action items
• Download as .md file via the browser
• Stretch goal: also offer clipboard copy

Tech notes

• This is a client-side feature (no backend changes needed)
• Use the existing session state to build the Markdown string
• Look at the retro data model to understand how cards, columns, and votes are structured

Acceptance criteria

• Export button visible on session page
• Downloads a .md file with structured retro summary
• Cards are grouped by column with vote counts
• Action items are listed separately if present
• Works after the session ends (from saved state)