Conversation export functionality is available

Users treat conversation content as their work product — research notes, code snippets, draft copy, meeting summaries. When the only way to extract that work is to scroll-select-copy message by message, users feel locked in, and locked-in users are hostile users. Export is a trust signal: it tells the customer "your data is yours," which also happens to be a GDPR Article 20 data-portability requirement for EU users and a hard requirement of most enterprise procurement checklists.

Ship a Markdown export first — it's one function and covers 90% of the use cases. Map messages to **Role:** content blocks joined with ---, wrap in a Blob, trigger a download with a[download]. Add JSON export once you have power users asking. Implement in src/components/chat/export-menu.tsx.

const blob = new Blob([markdown], { type: 'text/markdown' })
const a = Object.assign(document.createElement('a'), { href: URL.createObjectURL(blob), download: 'conversation.md' })
a.click()