account-state

Account state and in-memory event store patterns in Amethyst. Use when working with `Account.kt` (per-user StateFlow properties — follow list, relays, settings, mutes, bookmarks), `LocalCache` (the object-level event store backed by `LargeCache`), `User`/`Note` model classes, or any ViewModel that reads user-specific state. Covers how account events cascade from relay arrival to UI state, how to add a new account-scoped setting, and when to read from `LocalCache` vs subscribe to a StateFlow.