feat: export chat to markdown

[premiumjibles]

Summary

• Adds a download icon button in the dashboard header (next to ConnectWallet) with a dropdown to export chats as markdown
• "Export current chat" downloads the active conversation as {title-slug}.md
• "Export all chats" downloads all saved conversations as shapeshift-chats-export.md
• Menu items disable appropriately when no messages or no saved conversations exist

Test plan

• Verify download button appears in header alongside ConnectWallet
• Send messages, click "Export current chat" → downloads .md with correct User/Assistant sections
• Click "Export all chats" → downloads combined markdown with all saved conversations
• Verify "Export current chat" is disabled with no messages
• Verify "Export all chats" is disabled with no saved conversations
• bun run build passes

Closes SS-5108

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
shapeshift-agentic	Ready	Preview, Comment	Mar 13, 2026 1:04am

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: cb3ef97a-e293-45c0-afe7-03194097030a

📥 Commits

Reviewing files that changed from the base of the PR and between e96a7d0 and 92a0ff6.

📒 Files selected for processing (3)

• apps/agentic-chat/src/app/dashboard/page.tsx
• apps/agentic-chat/src/components/ExportChat.tsx
• apps/agentic-chat/src/utils/exportChat.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch ss-5108/export-chat

📝 Coding Plan

• Generate coding plan for human review comments

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