- Extract types.ts: Plugin types and category name mapping
- Extract PluginCard.tsx: Single plugin card component
- Extract MarketplaceTab.tsx: All plugins marketplace view
- Extract InstalledTab.tsx: Installed plugins view
- Extract InstallDialog.tsx: Plugin installation dialog with branch selection
- Create index.tsx: Main PluginsPage with WebSocket state management
- Delete original 1244-line plugins.tsx
- Maintain full functionality, zero logic changes
- Build verified: bun run build passes with zero errors
