Extract and port all space-related components from the console application to the shared @storacha/ui-react library. Space management is a core feature across Storacha applications, but these components are currently locked inside the console app, preventing reuse.

Components to Port

• SpaceEnsurer - Component that ensures a space exists before rendering children
• SpaceCreator - Form component for creating new spaces
• SpaceFinder - Search and selection interface for spaces
• SpacesList - List display with actions for managing spaces
• SpacesTabNavigation - Tab navigation for public/private spaces