- Show not-installed MCP presets directly in the list, consistent with existing UI (no modal)
- Toggle now supports enabling presets by writing to ~/.claude.json (mcpServers) and refreshing list
- Keep installed MCP entries unchanged (edit/delete/toggle)
fix(mcp): robust error handling and pre-submit validation
- Use extractErrorMessage in MCP panel and form to surface backend details
- Prevent pasting full config (with mcpServers) into single-server JSON field
- Add required-field checks: stdio requires non-empty command; http requires non-empty url
i18n: add messages for single-server validation and preset labels
chore: add data-only MCP presets file (no new dependencies)
