Explain the centralized page registry, primary-page retention TTL, typed lifecycle callbacks, and Host/Page state ownership. Document the cva and cn component convention and keep global CSS limited to theme, base rules, and shared keyframes.
- distinguish Host-global, tab-shell, and Page-private state
- describe the cross-tab handshake and ordering guards
- document mounted and keep-alive Page synchronization rules
- record the BroadcastChannel fallback behavior
- document opt-in page policy and the bounded cache
- define activate, deactivate, and dispose responsibilities
- explain hidden-frame state and command handling
- provide a Solid activity accessor example