Send beta user state with AppView requests (#11474)

src/storage/schema.ts

@@ -98,10 +98,9 @@ export type Account = {
   recentGifs?: Gif[]
 
   /**
-   * Cached from preferences (`bskyAppState.isBetaUser`) so the GrowthBook
-   * `isBetaUser` attribute can be set synchronously at analytics init, before
-   * beta-gated features (e.g. SearchV2Enable) are first evaluated. Written back
-   * when preferences load.
+   * Persistent cold-start snapshot of `bskyAppState.isBetaUser`. Hydrates the
+   * runtime cache so the GrowthBook attribute and request header are available
+   * synchronously before preferences load. Written back when preferences load.
    *
    * Scoped per account, since `isBetaUser` is account-specific preference data.
    * Reading it globally would let a beta account's value leak into a non-beta