- Update NewPartyClient and PartyPageClient to use correct Party props
- Remove unstable_cache from all data fetching functions
- Fix viewport metadata configuration in App Router
- Restore ToastViewport component in layout
- Fix import paths from 'types' to '~types' in Party components
- Add comprehensive PRD documenting the fixes
This addresses the interface mismatch between Party component and its
client wrappers that occurred during the App Router migration.
