Present in-app browser as sheet (#5718)

* use page sheet presentation

* move to its own file rather than sitting in prefs

* whoops, missed one

src/view/com/util/forms/PostDropdownBtn.tsx

@@ -18,6 +18,7 @@ import {msg, Trans} from '@lingui/macro'
 import {useLingui} from '@lingui/react'
 import {useNavigation} from '@react-navigation/native'
 
+import {useOpenLink} from '#/lib/hooks/useOpenLink'
 import {getCurrentRoute} from '#/lib/routes/helpers'
 import {makeProfileLink} from '#/lib/routes/links'
 import {CommonNavigatorParams, NavigationProp} from '#/lib/routes/types'
@@ -33,7 +34,6 @@ import {Shadow} from '#/state/cache/post-shadow'
 import {useFeedFeedbackContext} from '#/state/feed-feedback'
 import {useLanguagePrefs} from '#/state/preferences'
 import {useHiddenPosts, useHiddenPostsApi} from '#/state/preferences'
-import {useOpenLink} from '#/state/preferences/in-app-browser'
 import {usePinnedPostMutation} from '#/state/queries/pinned-post'
 import {
   usePostDeleteMutation,