- Extend useSessionFiles hook to fetch files for done column tasks
- Update TaskCard to display files-changed indicator on done column cards
- Add tests for useSessionFiles done column support
- Add tests for TaskCard files-changed display in done column
- Add workspace file APIs and hooks for session-scoped file browsing
- Create WorkspaceSelector component for switching between workspaces
- Update FileBrowserModal with workspace mode and improved UX
- Add files button to header with workspace-aware file browsing
- Add session files indicator to task cards for quick file access
- Include comprehensive tests for all new components and hooks