feat: export local and view exported & project sessions in web UI

[ndraiman]

Draft PR: Session Export and Local Viewing

Looking For Feedback

[!Note] This is a draft PR looking for feedback on the implementation approach and user experience.

Current Draft Limitation:

• Need to run opencode serve.
• Need to run web ui dev server bun --cwd packages/web dev.
  • Can also build using astro node adapter and run with bun
• Web UI port is hardcoded

https://github.com/user-attachments/assets/24a0cdfd-1093-4c07-80b4-98539f207f81

Summary

This PR adds the ability to export chat sessions to local storage and view them through a local web interface. Users can now:

• Export active sessions to local JSON files stored in the config directory
• Access exported sessions via local URLs (e.g., http://localhost:4321/local/{sessionId})
• Browse and manage exported sessions through new API endpoints

Key Changes

Server

• New API endpoints (packages/opencode/src/server/server.ts):

  • POST /session/:id/export - Export a session to local storage
  • GET /session/export - List all exported sessions
  • GET /session/:id/export - Retrieve specific exported session data

• Session export functionality (packages/opencode/src/session/index.ts):

  • Export sessions as JSON files to ~/.config/opencode/session-exports/
  • Include session metadata, messages, and export timestamp
  • Generate local URLs for web access

TUI

• New export command (packages/tui/internal/commands/command.go):
  • Added SessionExportCommand with trigger "export"
• Export functionality (packages/tui/internal/tui/tui.go):
  • Export current session and copy local URL to clipboard
  • Success/error toast notifications
• Generated client updates - Updated OpenAPI spec and Go client code

User Experience

1. User runs export command in active session
2. Session gets exported to local JSON file
3. Local URL (http://localhost:4321/local/{sessionId}) copied to clipboard
4. User can access exported session via browser at that URL

Technical Details

• Export files stored in ~/.config/opencode/session-exports/{sessionId}.json
• Local web server runs on port 4321
• Exported sessions include full conversation history and metadata
• Error handling for missing sessions and file operations