Header blurred banner on overscroll (take 2) (#5474)

* grow banner when overscrolling

* add blurview

* make backdrop blur as it scrolls

* add activity indicator

* use rotated spinner instead of arrow

* persist position of back button

* make back button prettier

* make blur less jarring

* Unify effects

* Tweak impl

* determine if should animate based on scroll amount

* sign comment

---------

Co-authored-by: Dan Abramov <dan.abramov@gmail.com>

src/state/queries/actor-starter-packs.ts

@@ -6,9 +6,9 @@ import {
   useInfiniteQuery,
 } from '@tanstack/react-query'
 
-import {useAgent} from 'state/session'
+import {useAgent} from '#/state/session'
 
-const RQKEY_ROOT = 'actor-starter-packs'
+export const RQKEY_ROOT = 'actor-starter-packs'
 export const RQKEY = (did?: string) => [RQKEY_ROOT, did]
 
 export function useActorStarterPacksQuery({did}: {did?: string}) {