- Remove authLoading spinner gate — app renders immediately for all visitors
- Expand isPublicRoute to include /, /global-items/*, /setups/*, /users/, /login
- Replace hard window.location.href redirect with soft navigate() after auth resolves
- Remove onboarding loading spinner — pass isAuthenticated as enabled to guard query
- Add AuthPromptModal to root JSX for global availability
- Guard Add to Collection and Add to Thread buttons with isAuthenticated check
- Rework setup detail page to use usePublicSetup for anonymous visitors
- Wrap all write action UI (Add Items, Delete, Public toggle, remove/classify) in isAuthenticated guards